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.
