JAVA TUTORIALS FOR BEGINNER: static

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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>
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<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>
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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.

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<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>
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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.

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<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>
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Output

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<pre class="java geshifilter-java" style="font-family: monospace;">10
200</pre>
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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:

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<pre class="java geshifilter-java" style="font-family: monospace;">min();</pre>
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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

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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>
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<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.

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<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 StaticBlock {
 public static void main(String[] args) {
 System.out.println("You are using Windows_NT operating system.");
 }
 
 static {
 String os = System.getenv("OS");
 if (os.equals("Windows_NT") != true) {
 System.exit(1);
 }
 }
}</pre>
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We are using getenv method of System class which returns value of 
environment variable name of which is passed an as argument to it. 
Windows_NT is a family of operating systems which includes Windows XP, 
Vista, 7, 8 and others.

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...

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Java static block program