Java basic program

Here i am demonstrating a simple program

public class test

{

public static void main(String args[])

{

System.out.println("Hello");

}

}

Save the above file as test.java

Compile the above program: javac test.java

run the program: java test

Output would be: Hello

In Java we write every thing in class. A class should contain a main method which is static and should return void. String args[] is used to take command line arguments.

so far we learned basic program we into some more depth

we will learn different ways of calling a method

public class test

{

public static void main(String args[])

{

int i;

test1 t=new test1(); // creating a instance of test1

i=t.normal(); // calling a method in class test1

System.out.println(i);

}

}

class test1 // this class should not be public

{

public int normal(){

try{

return 10;

}finally{

return 20;

}

}

}

Save the above file as test.java

Compile the above program: javac test.java

run the program: java test

Output would be: 20

Above program we wrote two classes, and accessing a method in one class from another class.

public class test

{

public static int normal(){ // this method should be static

try{

return 10;

}finally{

return 20;

}

}

public static void main(String args[])

{

int i;

test1 t=new test1(); // creating a instance of test1

i=t.normal(); // calling a method in class test1

System.out.println(i);

}

}

Save the above file as test.java

Compile the above program: javac test.java

run the program: java test

Output would be: 20

In the above above program we wrote two methods in one class and both method are static. We made normal method static because we want to access it from main method.