JAVA TUTORIALS FOR BEGINNER: program

Java constructor tutorial with code examples

blogger 0 code, constructor, examples, java, program, tutorial 07:36

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Constructor
 java tutorial: Java constructors are the methods which are used to 
initialize objects. Constructor method has the same name as that of 
class, they are called or invoked when an object of class is created and
 can't be called explicitly. Attributes of an object may be available 
when creating objects if no attribute is available then default 
constructor is called, also some of the attributes may be known 
initially. It is optional to write constructor method in a class but due
 to their utility they are used.

<h2>
Java constructor example</h2>
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">class Programming {
 //constructor method
 Programming() {
 System.out.println("Constructor method called.");
 }
 
 public static void main(String[] args) {
 Programming object = new Programming(); //creating object
 }
}</pre>
</div>
 
 
Output 
 
<img alt="Java constructor example" src="http://www.programmingsimplified.com/images/java/constructor-java.png" /> 
This code is the simplest example of constructor, we create class 
Programming and create an object, constructor is called when object is 
created. As you can see in output "Constructor method called." is 
printed.

<h2>
Java constructor overloading</h2>
Like other methods in java constructor can be overloaded i.e. we can 
create as many constructors in our class as desired. Number of 
constructors depends on the information about attributes of an object we
 have while creating objects. See constructor overloading example:

<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;"> </pre>
<pre class="java geshifilter-java" style="font-family: monospace;">class Language {
 String name;
 
 Language() {
 System.out.println("Constructor method called.");
 }
 
 Language(String t) {
 name = t;
 }
 
 public static void main(String[] args) {
 Language cpp = new Language();
 Language java = new Language("Java");
 
 cpp.setName("C++");
 
 java.getName();
 cpp.getName();
 }
 
 void setName(String t) {
 name = t;
 }
 
 void getName() {
 System.out.println("Language name: " + name);
 }
}</pre>
</div>
 
Output 
 
<img alt="Java constructor overloading program" src="http://www.programmingsimplified.com/images/java/constructor-overloading-java.png" />

When cpp object is created default constructor is called and when java object is created constructor with argument is called, setName method is used to set 'name' attribute of language, getName method prints language name.

<h2>
Java constructor chaining</h2>
Constructor chaining occurs when a class inherits another class i.e. 
in inheritance, as in inheritance sub class inherits the properties of 
super class. Both the super and sub class may have constructor methods, 
when an object of sub class is created it's constructor is invoked it 
initializes sub class attributes, now super class constructor needs to 
be invoked, to achieve this java provides a <code class="java geshifilter-java">super</code>
 keyword through which we can pass arguments to super class constructor.
 For more understanding see constructor chaining example:

<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;"> </pre>
<pre class="java geshifilter-java" style="font-family: monospace;"> </pre>
<pre class="java geshifilter-java" style="font-family: monospace;">class GrandParent {
 int a;
 
 GrandParent(int a) {
 this.a = a;
 }
}
 
class Parent extends GrandParent {
 int b;
 
 Parent(int a, int b) {
 super(a);
 this.b = b;
 }
 
 void show() {
 System.out.println("GrandParent's a = " + a);
 System.out.println("Parent's b = " + b);
 }
}
 
class Child {
 public static void main(String[] args) {
 Parent object = new Parent(8, 9);
 object.show();
 }
}</pre>
</div>
 
Output 
 
 
<img alt="Java constructor chaining program example" src="http://www.programmingsimplified.com/images/java/constructor-chaining-java.png" />

Constructor method doesn't specify a return type, they return instance of class itself.

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Java constructor tutorial with code examples

Constructor java tutorial: Java constructors are the methods which are used to initialize objects. Co...

Java static method

blogger 0 core java, method, program, programming, static 07:33

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Java
 static method program: static methods in Java can be called without 
creating an object of class. Have you noticed why we write static 
keyword when defining main it's because program execution begins from 
main and no object has been created yet. Consider the example below to 
improve your understanding of static methods.

<h2>
Java static method example program</h2>
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">class Languages {
 public static void main(String[] args) {
 display();
 }
 
 static void display() {
 System.out.println("Java is my favorite programming language.");
 }
}</pre>
<pre class="java geshifilter-java" style="font-family: monospace;"> </pre>
</div>
Output 
 
<img alt="Java static method program" src="http://www.programmingsimplified.com/images/java/java-static-method-program.png" /> 
 
<h2>
Java static method vs instance method</h2>
Instance method requires an object of its class to be created before 
it can be called while static method doesn't require object creation.

<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">class Difference {
 
 public static void main(String[] args) {
 display(); //calling without object
 Difference t = new Difference();
 t.show(); //calling using object
 }
 
 static void display() {
 System.out.println("Programming is amazing.");
 }
 
 void show(){
 System.out.println("Java is awesome.");
 }
}</pre>
</div>
Output 
 
<img alt="Static vs instance method program" src="http://www.programmingsimplified.com/images/java/static-method-vs-non-static-method.png" /> 
 
<h3>
Using static method of another classes</h3>
If you wish to call static method of another class then you have to 
write class name while calling static method as shown in example below.

<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">import java.lang.Math;
 
class Another {
 public static void main(String[] args) {
 int result;
 
 result = Math.min(10, 20); //calling static method min by writing class name
 
 System.out.println(result);
 System.out.println(Math.max(100, 200));
 }
}</pre>
</div>
Output

<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">10
200</pre>
</div>
Here we are using min and max methods of Math class, min returns 
minimum of two integers and max returns maximum of two integers. 
Following will produce an error:

<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">min();</pre>
</div>
We need to write class name because many classes may have a method with same name which we are calling.

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Java static method

Java static method program: static methods in Java can be called without creating an object of class....

Java static block program

blogger 0 core java, program, static, static block 07:31

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Java
 programming language offers a block known as static which is executed 
before main method executes. Below is the simplest example to understand
 functioning of static block later we see a practical use of static 
block.

<h2>
Java static block program</h2>
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">class StaticBlock {
 public static void main(String[] args) {
 System.out.println("Main method is executed.");
 }
 
 static {
 System.out.println("Static block is executed before main method.");
 }
}</pre>
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Output  
 
 
<img alt="Java static block program" src="http://www.programmingsimplified.com/images/java/java-static-block-program.png" />

Static block can be used to check conditions before execution of main
 begin, Suppose we have developed an application which runs only on 
Windows operating system then we need to check what operating system is 
installed on user machine. In our java code we check what operating 
system user is using if user is using operating system other than 
"Windows" then the program terminates.

Output 
 
<img alt="Java static block program" src="http://www.programmingsimplified.com/images/java/java-static-block-program-2.png" />

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Java static block program

Java programming language offers a block known as static which is executed before main method execute...

Java methods

blogger 0 concept, core java, java, methods, program 07:30

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Java
 methods tutorial: Java program consists of one or more classes and a 
class may contain method(s). 
 A class can do very little without methods.
 In this tutorial we will learn about Java methods. Methods are known as
 functions in C and C++ programming languages. A method has a name and 
return type. Main method is a must in a Java program as execution begins
 from it.

<h2>
Syntax of methods</h2>
"Access specifier" "Keyword(s)" "return type" methodName(List of arguments) { 
 // Body of method 
}

Access specifier can be public or private which decides whether other classes can call a method. 
Kewords are used for some special methods such as static or synchronized. 
Return type indicate return value which method returns. 
Method name is a valid Java identifier name.

Access specifier, Keyword and arguments are optional.

Examples of methods declaration: 
public static void main(String[] args); 
void myMethod(); 
private int maximum(); 
public synchronized int search(java.lang.Object);

<h2>
Java Method example program</h2>
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">class Methods {
 
 // Constructor method
 
 Methods() {
 System.out.println("Constructor method is called when an object of it's class is created");
 }
 
 // Main method where program execution begins
 
 public static void main(String[] args) {
 staticMethod();
 Methods object = new Methods();
 object.nonStaticMethod();
 }
 
 // Static method
 
 static void staticMethod() {
 System.out.println("Static method can be called without creating object");
 }
 
 // Non static method
 
 void nonStaticMethod() {
 System.out.println("Non static method must be called by creating an object");
 }
}</pre>
</div>
Output 
 
 
<img alt="Java methods program output" src="http://www.programmingsimplified.com/images/java/methods-java.png" />

<h2>
Java methods list</h2>
Java has a built in library of many useful classes and there are 
thousands of methods which can be used in your programs. Just call a 
method and get your work done :) . You can find list of methods in a 
class by typing following command on command prompt:

javap package.classname

For example 
javap java.lang.String // list all methods and constants of String class. 
javap java.math.BigInteger // list constants and methods of BigInteger class in java.math package

<h2>
Java String methods</h2>
String class contains methods which are useful for performing 
operations on String(s). Below program illustrate how to use inbuilt 
methods of String class.

<h3>
Java string class program</h3>
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">class StringMethods
{
 public static void main(String args[])
 {
 int n;
 String s = "Java programming", t = "", u = "";
 
 System.out.println(s);
 
 // Find length of string
 
 n = s.length();
 System.out.println("Number of characters = " + n);
 
 // Replace characters in string
 
 t = s.replace("Java", "C++");
 System.out.println(s);
 System.out.println(t);
 
 // Concatenating string with another string
 
 u = s.concat(" is fun");
 System.out.println(s);
 System.out.println(u);
 }
}</pre>
</div>
Output 
 
<img alt="Java string methods program" src="http://www.programmingsimplified.com/images/java/string-methods-java.png" />

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Java methods

Java methods tutorial: Java program consists of one or more classes and a class may contain meth...

How to get input from user in java

blogger 0 core java, input, program, scanner class, source code, user 07:27

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This
 program tells you how to get input from user in a java program. We are 
using Scanner class to get input from user. This program firstly asks 
the user to enter a string and then the string is printed, then an 
integer and entered integer is also printed and finally a float and it 
is also printed on the screen. Scanner class is present in java.util 
package so we import this package in our program. We first create an 
object of Scanner class and then we use the methods of Scanner class. 
Consider the statement 
 
 Scanner a = new Scanner(System.in);  
 
Here Scanner is the class name, a is the name of object, new 
keyword is used to allocate the memory and System.in is the input 
stream. Following methods of Scanner class are used in the program below
 :- 
1) nextInt to input an integer 
2) nextFloat to input a float 
3) nextLine to input a string

<h2>
 </h2>
<h2>
Java programming source code</h2>
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">import java.util.Scanner;
 
class GetInputFromUser
{
 public static void main(String args[])
 {
 int a;
 float b;
 String s;
 
 Scanner in = new Scanner(System.in);
 
 System.out.println("Enter a string");
 s = in.nextLine();
 System.out.println("You entered string "+s);
 
 System.out.println("Enter an integer");
 a = in.nextInt();
 System.out.println("You entered integer "+a);
 
 System.out.println("Enter a float");
 b = in.nextFloat();
 System.out.println("You entered float "+b); 
 }
}</pre>
</div>

Output 
 
 
<img alt="user input" src="http://www.programmingsimplified.com/images/java/user-input-java.png" />

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How to get input from user in java

This program tells you how to get input from user in a java program. We are using Scanner class ...

Java program to print alphabets

blogger 0 alphabat, do while loop, if loop, java, program, while loop 07:25

<h2>
Java source code</h2>
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">class Alphabets
{
 public static void main(String args[])
 {
 char ch;
 
 for( ch = 'a' ; ch <= 'z' ; ch++ )
 System.out.println(ch);
 }
}</pre>
</div>
You can easily modify the above java program to print alphabets in upper case.

Output 
 
 
 
<img alt="alphabets" src="http://www.programmingsimplified.com/images/java/alphabets-java.png" />

Printing alphabets using while loop (only body of main method is shown):

<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;"> </pre>
<pre class="java geshifilter-java" style="font-family: monospace;">char c = 'a';
 
while (c <= 'z') {
 System.out.println(c);
 c++;
}</pre>
</div>
 
 
Using do while loop:

<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">char c = 'A';
 
do {
 System.out.println(c);
 c++;
} while (c <= 'Z');</pre>
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Java program to print alphabets

This program print alphabets on screen i.e a, b, c, ..., z. Here we print alphabets in lower case....

For loop loop program in java

blogger 0 for loop, java, program 07:41

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Java for loop used to repeat execution of statement(s) until a certain condition holds true. <code class="java geshifilter-java">for</code> is a keyword in Java programming language.

<h2>
Java for loop syntax </h2>
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">for (/* Initialization of variables */ ; /*Conditions to test*/ ; /* Increment(s) or decrement(s) of variables */) {
 // Statements to execute i.e. Body of for loop
}</pre>
</div>
You can initialize multiple variables, test many conditions and 
perform increments or decrements on many variables according to 
requirement. Please note that all three components of for loop are 
optional. For example following for loop prints "Java programmer" 
indefinitely.

<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">// Infinite for loop
for (;;) {
 System.out.println("Java programmer");
}</pre>
</div>
You can terminate an infinite loop by pressing Ctrl+C.

<h2>
Simple for loop example in Java</h2>
Example program below uses for loop to print first 10 natural numbers i.e. from 1 to 10.

<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">//Java for loop program
class ForLoop {
 public static void main(String[] args) {
 int c;
 
 for (c = 1; c <= 10; c++) {
 System.out.println(c);
 }
 }
}</pre>
</div>
OUTPUT : 
 <img alt="Java for loop example program output" src="http://www.programmingsimplified.com/images/java/java-for-loop-example-program.png" />

<h2>
Java for loop example to print stars in console</h2>
Following star pattern is printed 
* 
** 
*** 
**** 
*****

<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">class Stars {
 public static void main(String[] args) {
 int row, numberOfStars;
 
 for (row = 1; row <= 10; row++) {
 for(numberOfStars = 1; numberOfStars <= row; numberOfStars++) {
 System.out.print("*");
 }
 System.out.println(); // Go to next line
 }
 }
}</pre>
</div>
Above program uses nested for loops (for loop inside a for loop) to 
print stars. You can also use spaces to create another pattern, It is 
left for you as an exercise. 
 
 
OUTPUT

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For loop loop program in java

Java for loop used to repeat execution of statement(s) until a certain condition holds true. for ...

Java if else program

blogger 0 if else, ifelse, java, program 07:37

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Java if else program uses if else to execute statement(s) when a 
condition is fulfilled. Below is a simple program which explains the 
usage of if else in java programming language.

<h2>
Java programming if else statement</h2>
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">// If else in Java code
import java.util.Scanner;
 
class IfElse {
 public static void main(String[] args) {
 int marksObtained, passingMarks;
 
 passingMarks = 40;
 
 Scanner input = new Scanner(System.in);
 
 System.out.println("Input marks scored by you");
 
 marksObtained = input.nextInt();
 
 if (marksObtained >= passingMarks) {
 System.out.println("You passed the exam.");
 }
 else {
 System.out.println("Unfortunately you failed to pass the exam.");
 }
 }
}</pre>
</div>
 
Output 
 
<img alt="Java if else program output" src="http://www.programmingsimplified.com/images/java/java-if-else-program.png" />

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Java if else program

Java if else program uses if else to execute statement(s) when a condition is fulfilled. Below is a simple program which explains the us...

Bubble sort program in Java

blogger 0 bubble sort, java, program 07:35

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Java program to bubble sort: This code sorts numbers inputted by user using Bubble sort algorithm. 
<h2>
Java programming code</h2>
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">import java.util.Scanner;
 
class BubbleSort {
 public static void main(String []args) {
 int n, c, d, swap;
 Scanner in = new Scanner(System.in);
 
 System.out.println("Input number of integers to sort");
 n = in.nextInt();
 
 int array[] = new int[n];
 
 System.out.println("Enter " + n + " integers");
 
 for (c = 0; c < n; c++) 
 array[c] = in.nextInt();
 
 for (c = 0; c < ( n - 1 ); c++) {
 for (d = 0; d < n - c - 1; d++) {
 if (array[d] > array[d+1]) /* For descending order use < */
 {
 swap = array[d];
 array[d] = array[d+1];
 array[d+1] = swap;
 }
 }
 }
 
 System.out.println("Sorted list of numbers");
 
 for (c = 0; c < n; c++) 
 System.out.println(array[c]);
 }
}</pre>
<pre class="java geshifilter-java" style="font-family: monospace;"> </pre>
<pre class="java geshifilter-java" style="font-family: monospace;"> </pre>
<pre class="java geshifilter-java" style="font-family: monospace;"> </pre>
<pre class="java geshifilter-java" style="font-family: monospace;">Output </pre>
</div>
 
 <img alt="Bubble sort Java program output" src="http://www.programmingsimplified.com/images/java/bubble-sort-java.png" /> 
 
 
You can also use sort method of Arrays class to sort integers in 
ascending order but remember that sort method uses a variation of Quick 
sort algorithm. 
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">import java.util.Arrays;
 
class Sort
{
 public static void main(String args[])
 {
 int data[] = { 4, -5, 2, 6, 1 };
 
 Arrays.sort(data);
 
 for (int c: data) 
 {
 System.out.println(c);
 }
 }
}</pre>
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Bubble sort program in Java

Java program to bubble sort: This code sorts numbers inputted by user using Bubble sort algorithm. Java programming code impo...

Java program to get ip address

blogger 0 core java, core java interview question, How to, ip address, java, java networking tutorial, program 07:32

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<div class="field field-name-body field-type-text-with-summary field-label-hidden">
<div class="field-items">
<div class="field-item even">
This
 program prints IP or internet protocol address of your computer system.
 InetAddress class of java.net package is used, getLocalHost method 
returns InetAddress object which represents local host. 
<h2>
Java programming source code</h2>
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">import java.net.InetAddress;
 
class IPAddress
{
 public static void main(String args[]) throws Exception
 {
 System.out.println(InetAddress.getLocalHost());
 }
}</pre>
</div>
 
 
Output 
 
 
 
<img alt="IP address" src="http://www.programmingsimplified.com/images/java/ip-address-java.png" /> 
 </div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<a href="http://creativecommons.org/licenses/by-nc-nd/3.0/" rel="license"></a></div>

Java program to get ip address

This program prints IP or internet protocol address of your computer system. InetAddress class of java.net package is used, getLo...

Java program to compare two strings

blogger 0 compare, java, program, two strings 07:30

<div dir="ltr" style="text-align: left;" trbidi="on">
This program compare strings i.e test whether two strings are equal 
or not, compareTo method of String class is used to test equality of two
 String class objects. compareTo method is case sensitive i.e "java" and
 "Java" are two different strings if you use compareTo method. If you 
wish to compare strings but ignoring the case then use 
compareToIgnoreCase method.

<h2>
Java programming code</h2>
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">import java.util.Scanner;
 
class CompareStrings
{
 public static void main(String args[])
 {
 String s1, s2;
 Scanner in = new Scanner(System.in);
 
 System.out.println("Enter the first string");
 s1 = in.nextLine();
 
 System.out.println("Enter the second string");
 s2 = in.nextLine();
 
 if ( s1.compareTo(s2) > 0 )
 System.out.println("First string is greater than second.");
 else if ( s1.compareTo(s2) < 0 )
 System.out.println("First string is smaller than second.");
 else 
 System.out.println("Both strings are equal.");
 }
}</pre>
</div>
 
 
Output

</div>

Java program to compare two strings

This program compare strings i.e test whether two strings are equal or not, compareTo method of String class is used to test equality of t...

armstrong number program in java

blogger 0 armstrong number, coding, java, program 07:28

<div dir="ltr" style="text-align: left;" trbidi="on">
<div class="block block-system" id="block-system-main">
<div class="content">
<div class="node node-page node-full clearfix" id="node-126">
<div class="content clearfix">
<div class="field field-name-body field-type-text-with-summary field-label-hidden">
<div class="field-items">
<div class="field-item even">
 
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjby-4b94clLKZqwAJxms2MZbaRn_oiMc_vsPvZH_3AZu1JQD39P8ccKRmaJVuAXL6uf4W06oqMf-BhEJ_y8AdBuECSMBevUFCZj2ZgNuvW6OYlnCOA9xd03z_SsAtSb2ro-MK5Cpm169Y4/s1600/armstrong+number+in+java.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="238" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjby-4b94clLKZqwAJxms2MZbaRn_oiMc_vsPvZH_3AZu1JQD39P8ccKRmaJVuAXL6uf4W06oqMf-BhEJ_y8AdBuECSMBevUFCZj2ZgNuvW6OYlnCOA9xd03z_SsAtSb2ro-MK5Cpm169Y4/s1600/armstrong+number+in+java.JPG" width="320" /></a></div>
This
 java program checks if a number is Armstrong or not. Armstrong number 
is a number which is equal to sum of digits raise to the power total 
number of digits in the number. Some Armstrong numbers are: 0, 1, 4, 5, 
 9, 153, 371, 407, 8208 etc. 
<h2>
Java programming code</h2>
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">import java.util.Scanner;
 
class ArmstrongNumber
{
 public static void main(String args[])
 {
 int n, sum = 0, temp, remainder, digits = 0;
 
 Scanner in = new Scanner(System.in);
 System.out.println("Input a number to check if it is an Armstrong number"); 
 n = in.nextInt();
 
 temp = n;
 
 // Count number of digits
 
 while (temp != 0) {
 digits++;
 temp = temp/10;
 }
 
 temp = n;
 
 while (temp != 0) {
 remainder = temp%10;
 sum = sum + power(remainder, digits);
 temp = temp/10;
 }
 
 if (n == sum)
 System.out.println(n + " is an Armstrong number.");
 else
 System.out.println(n + " is not an Armstrong number."); 
 }
 
 static int power(int n, int r) {
 int c, p = 1;
 
 for (c = 1; c <= r; c++) 
 p = p*n;
 
 return p; 
 }
}</pre>
</div>
 
Output 
 
 
 
 
<img alt="Armstrong number java program output" src="http://www.programmingsimplified.com/images/java/Armstrong-number-java.png" /> 
 </div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>

armstrong number program in java

This java program checks if a number is Armstrong or not. Armstrong number is a number which is equal to sum of digits raise to...

Factorial program in java

blogger 0 coding, factorial, java, program, programming 07:22

<div dir="ltr" style="text-align: left;" trbidi="on">
 
 
 
 
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7eXoeSEA_fi3WsjRxXjWEhEGwv0dqxbVSQgDnOq14xWqKGayeayYpnDTtYzjX6TJ1d7acVjhinE07K1P1H14y7UGYhr3I3lVf7VFuDtWQtvtpKx40TbCLkVTq7YNINGSH_MQgdTqQNq_M/s1600/factorial+program+in+java.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="274" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7eXoeSEA_fi3WsjRxXjWEhEGwv0dqxbVSQgDnOq14xWqKGayeayYpnDTtYzjX6TJ1d7acVjhinE07K1P1H14y7UGYhr3I3lVf7VFuDtWQtvtpKx40TbCLkVTq7YNINGSH_MQgdTqQNq_M/s1600/factorial+program+in+java.JPG" width="320" /></a></div>
 
 
 
 
 
 
 
 
import java.util.Scanner;  class Factorial {    public static void main(String args[])    {       int n, c, fact = 1;       System.out.println("Enter an integer to calculate it's factorial");       Scanner in = new Scanner(System.in);       n = in.nextInt();       if ( n < 0 )          System.out.println("Number should be non-negative.");       else       {          for ( c = 1 ; c <= n ; c++ )             fact = fact*c;          System.out.println("Factorial of "+n+" is = "+fact);       }    } } 
 
 
OUTPUT 
 
 
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEib1JzvMc0cBsjVGSUemQ5vQ2OOP7B7rjEmqo5bOBHvHPtWcr0RcYi-4Wt4ww8hJzahE03s7rp2y5DxvtdZSdFMZniljaE0QJzk8zmVjkaYIZiTTalbper0hS2Bpw-i8XkwguPVLFTmHh7i/s1600/factorial-java.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="165" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEib1JzvMc0cBsjVGSUemQ5vQ2OOP7B7rjEmqo5bOBHvHPtWcr0RcYi-4Wt4ww8hJzahE03s7rp2y5DxvtdZSdFMZniljaE0QJzk8zmVjkaYIZiTTalbper0hS2Bpw-i8XkwguPVLFTmHh7i/s1600/factorial-java.png" width="320" /></a></div>
 
 </div>

Factorial program in java

import java.util.Scanner; class Factorial { public static void main(String args[]) { int n, c, fact = 1; S...

Palindrome program in java

blogger 0 java, palindrome, program 09:55

<div class="blogaway-section"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjEFpQmb39mE59IysL4yIoefM2hyBJrpWcsW2Qiy_I-F6Af9mfQgHKeTm9gPQrBZx91d3gVz0_sLILfEt2Qky3ftb-n3LtRe6Y0c6A6-YCxUcJKzKLMs7ntlM6Saoytlbs7nmnwHiZxKRO3/ cursor: pointer;"> 
 import java.util.*; 
class Palindrome 
 { 
    public static void main(String args[]) 
    { 
       String original, reverse=""; 
       Scanner in = new Scanner(System.in); 
       System.out.print("Enter a string : "); 
       original = in.nextLine(); 
       int length = original.length(); 
      for ( int i = length - 1 ; i >= 0 ; i-- ) 
          reverse = reverse + original.charAt(i); 
       if (original.equals(reverse)) 
          System.out.println("Entered string is a palindrome."); 
       else 
          System.out.println("Entered string is not a palindrome."); 
    } 
 }   
 OUTPUT 
 Enter a string : madam 
Entered string is a palindrome. </div>

Palindrome program in java

import java.util.*; class Palindrome { public static void main(String args[]) { String original, reverse=""; ...

Calculator program in java

blogger 0 calculator, java, program 09:48

<div style="text-align: center; padding: 5px;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgctfd8Pd3eFigCOnvjz26AX4J9jUf6tvA4dadU2-rjsI-BE4_ZLoLpyynJrXPhwru4OF4CGVXVHjN7q5NGhi2tU0fKLRkJej5opjhRQMoVUYZkW_xN-cLCWOSf1HLtDMGJtc18fv-FQL_L/"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgctfd8Pd3eFigCOnvjz26AX4J9jUf6tvA4dadU2-rjsI-BE4_ZLoLpyynJrXPhwru4OF4CGVXVHjN7q5NGhi2tU0fKLRkJej5opjhRQMoVUYZkW_xN-cLCWOSf1HLtDMGJtc18fv-FQL_L/ cursor: pointer;" style="border: 1px solid; border-radius: 2px;padding: 5px; max-width: 320px " width="320px" /></a></div><div class="blogaway-section">import java.util.Scanner; 
import java.io.*; 
 public class Calculator { 
     public static void main(String[] args) { 
         int choice; 
        int x = 0; 
        int y = 0; 
        int sum; 
         
        PrintStream out; 
         
        Scanner input ; 
         Calculator calc = new Calculator(); 
         try { 
            out = new PrintStream("calclog.txt"); 
             do { 
                System.out.println("Calculator Program"); 
                System.out.println("--------------------\n"); 
                System.out.println("1. Add"); 
                System.out.println("2. Subtract"); 
                System.out.println("3. Multiply"); 
                System.out.println("4. Divide"); 
                System.out.println("5. Mod"); 
                System.out.println("6. Power"); 
                System.out.println("99. End Program\n"); 
                System.out.println("Enter Choice: "); 
                 input = new Scanner(System.in); 
                choice = input.nextInt(); 
                 while ((choice < 1 || choice > 6) && choice != 99) { 
                     System.out.println("Please enter 1, 2, 3, 4, 5, or 6: "); 
                    choice = input.nextInt(); 
                 } 
                 if (choice != 99) { 
                     System.out.println("Please enter 2 numbers only: "); 
                    x = input.nextInt(); 
                    y = input.nextInt(); 
                 } 
                 switch (choice) { 
                 
                case 1: 
                     
                    sum = calc.add(x, y); 
                    System.out.printf("The sum is %d\n\n", sum); 
                    out.println(x + "+" + y + "=" + sum); 
                     
                    break; 
                 case 2: 
                     
                    sum = calc.sub(x, y); 
                    System.out.printf("The answer is %d\n\n", sum); 
                    out.println(x + "-" + y + "=" + sum); 
                     
                    break; 
                 case 3: 
                     
                    sum = calc.multi(x, y); 
                    System.out.printf("The answer is %d\n\n", sum); 
                    out.println(x + "*" + y + "=" + sum); 
                     
                    break; 
                 case 4: 
                     
                    try { 
                         sum = calc.div(x, y); 
                        System.out.printf("The answer is %d\n\n", sum); 
                        out.println(x + "/" + y + "=" + sum); 
                     } catch (Exception e) { 
                         System.out 
                                .println("\nError: Cannot Divide by zero\n\n"); 
                     } 
                     
                    break; 
                 case 5: 
                     
                    sum = calc.mod(x, y); 
                    System.out.printf("The mod is %d\n\n", sum); 
                    out.println(x + "%" + y + "=" + sum); 
                     
                    break; 
                 case 6: 
                     
                    sum = calc.pow(x, y); 
                    System.out.printf("The answer is %d\n\n", sum); 
                    out.println(x + "^" + y + "=" + sum); 
                     
                    break; 
                } 
             } 
             while (choice != 99); 
            input.close(); 
            System.out.println("Ending program..."); 
         } 
         catch (Exception e) { 
            System.out.println("ERROR: Some error occured"); 
            e.printStackTrace(); 
        } 
     } 
     public int add(int num1, int num2) { 
         int sum; 
        sum = num1 + num2; 
         return sum; 
    } 
     public int sub(int num1, int num2) { 
         int sum; 
        sum = num1 - num2; 
         return sum; 
    } 
     public int multi(int num1, int num2) { 
         int sum; 
        sum = num1 * num2; 
         return sum; 
    } 
     public int div(int num1, int num2) { 
         int sum; 
        sum = num1 / num2; 
         return sum; 
    } 
     public int mod(int num1, int num2) { 
         int sum; 
        sum = num1 % num2; 
         return sum; 
    } 
     public int pow(int base, int exp) { 
         int sum = 1; 
         if (exp == 0) { 
            sum = 1; 
        } 
         while (exp > 0) { 
            sum = sum * base; 
            exp--; 
         } 
         return sum; 
     } 
 } 
OUTPUT 
 Calculator Program 
-------------------- 
 1. Add 
2. Subtract 
3. Multiply 
4. Divide 
5. Mod 
6. Power 
99. End Program 
 Enter Choice: 
4 
Please enter 2 numbers only: 
4 
2 
The answer is 2 
 Calculator Program 
-------------------- 
 1. Add 
2. Subtract 
3. Multiply 
4. Divide 
5. Mod 
6. Power 
99. End Program 
 Enter Choice: 
99 
Ending program...</div>

Calculator program in java

import java.util.Scanner; import java.io.*; public class Calculator { public static void main(String[] args) { int choice; ...

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