Callling a method

Maybe this sounds more complicated than it is: It simply means that in the body of one method, you invoke another method, which then does whatever it should do. For example:

method1() {
   //does something...
}
method2(){
   //does something, then calls method1:
   method1();
}

This basically happens all the time, even for example in the classic "Hello World"-example:

public static void main(String[] args) {
        System.out.println("Hello, World!");
    }

Here the main method calls the println()-method.