JAVA TUTORIALS FOR BEGINNER: java

Java exception handling tutorial with example programs

blogger 0 exception handling, java, l example, programs, tutoria 07:39

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Java
 exception handling tutorial: In this tutorial we will learn how to 
handle exception with the help of suitable examples. Exceptions are 
errors which occur when the program is executing. Consider the Java 
program below which divides two integers. 
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;"> </pre>
<pre class="java geshifilter-java" style="font-family: monospace;">import java.util.Scanner;
 
class Division {
 public static void main(String[] args) {
 
 int a, b, result;
 
 Scanner input = new Scanner(System.in);
 System.out.println("Input two integers");
 
 a = input.nextInt();
 b = input.nextInt();
 
 result = a / b;
 
 System.out.println("Result = " + result);
 }
}</pre>
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Now we compile and execute the above code two times, see the output of program in two cases: 
 
<img alt="Java program throwing Arithmetic exception (division by zero)." src="http://www.programmingsimplified.com/images/java/division-by-zero-exception-java-program.png" /> 
 
In the second case we are dividing a by zero which is not allowed in 
mathematics, so a run time error will occur i.e. an exception will 
occur. If we write programs in this way then they will be terminated 
abnormally and user who is executing our program or application will not
 be happy. This occurs because input of user is not valid so we have to 
take a preventive action and the best thing will be to notify the user 
that it is not allowed or any other meaningful message which is relevant
 according to context. You can see the information displayed when 
exception occurs it includes name of thread, file name, line of code (14
 in this case) at which exception occurred, name of exception 
(ArithmeticException) and it's description('/ by zero'). Note that 
exceptions don't occur only because of invalid input only there are 
other reasons which are beyond of programmer control such as stack 
overflow exception, out of memory exception when an application requires
 memory larger than what is available. 
Java provides a powerful way to handle such exceptions which is known
 as exception handling. In it we write vulnerable code i.e. code which 
can throw exception in a separate block called as <code class="java geshifilter-java">try</code> block and exception handling code in another block called <code class="java geshifilter-java">catch</code> block. Following modified code handles the exception. 
<h2>
Java exception handling example</h2>
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">class Division {
 public static void main(String[] args) {
 
 int a, b, result;
 
 Scanner input = new Scanner(System.in);
 System.out.println("Input two integers");
 
 a = input.nextInt();
 b = input.nextInt();
 
 // try block
 
 try {
 result = a / b;
 System.out.println("Result = " + result);
 }
 
 // catch block
 
 catch (ArithmeticException e) {
 System.out.println("Exception caught: Division by zero.");
 }
 }
}</pre>
</div>
Whenever an exception is caught corresponding catch block is 
executed, For example above code catches ArithmeticException only. If 
some other kind of exception is thrown it will not be caught so it's the
 programmer work to take care of all exceptions as in our try block we 
are performing arithmetic so we are capturing only arithmetic 
exceptions. A simple way to capture any exception is to use an object of
 Exception class as other classes inherit Exception class, see another 
example below: 
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">class Exceptions {
 public static void main(String[] args) {
 
 String languages[] = { "C", "C++", "Java", "Perl", "Python" };
 
 try {
 for (int c = 1; c <= 5; c++) {
 System.out.println(languages[c]);
 }
 }
 catch (Exception e) {
 System.out.println(e);
 }
 }
}</pre>
</div>
 
Output 
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;"> </pre>
<pre class="java geshifilter-java" style="font-family: monospace;">C++
Java
Perl
Python
java.lang.ArrayIndexOutOfBoundsException: 5</pre>
</div>
Here our catch block capture an exception which occurs because we are
 trying to access an array element which does not exists (languages[5] 
in this case). Once an exception is thrown control comes out of try 
block and remaining instructions of try block will not be executed. At 
compilation time syntax and semantics checking is done and code is not 
executed on machine so exceptions can only be detected at run time. 
<h2>
Finally block in Java</h2>
Finally block is always executed whether an exception is thrown or not. 
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">class Allocate {
 public static void main(String[] args) {
 
 try {
 long data[] = new long[1000000000]; 
 }
 catch (Exception e) {
 System.out.println(e);
 }
 
 finally {
 System.out.println("finally block will execute always.");
 }
 }
}</pre>
</div>
Output 
 
<div class="geshifilter">
<pre class="java geshifilter-java" style="font-family: monospace;">finally block will execute always.
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at Allocate.main(Allocate.java:5)</pre>
</div>
Exception occurred because we try to allocate a large amount of 
memory which is not available. This amount of memory may be available on
 your system if this is the case try increasing the amount of memory to 
allocate through the program.</div>
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Java exception handling tutorial with example programs

Java exception handling tutorial: In this tutorial we will learn how to handle exception with the help of suitable examples. Excep...

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 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...

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

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<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>
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</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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