Java Classes Introducing Methods Fundamental of method

                       Java Classes Introducing Methods

Introducing Methods:

Classes usually consist of two things: Instance Variables and Methods. The general form of a method:

type name (parameter-list) {

        body of method

}

type specifies the type of data returned by the method. This can be valid type, including class types that you create. If the method does not return a value, its return type must be void. The name of the method is specified by name. It is a legal identifier other than used by other items within current scope. The parameter-list is a sequence of type and identifier pairs separated by commas. If the method has no parameter, then the parameter list will be empty.

Methods that have a return type other than void return  a value to the calling routine using the following form of the return statement:

return value;

value is the value returned.

Java Program Showing Use of class having method and returns a value by Asad Hussain:

 /*
         This is Java Program Showing Use of class having method and returns a value.
          Program developed by #Asad Hussain
         This file name is "Returnmethod.java".
*/
import java.util.*;
class Rectangle {
    double width;
    double length;

    double area() {
        return length * width;

}

}
public class Returnmethod{
    public static void main(String args[]){
  
        Rectangle myrectangle1 = new Rectangle();
        Rectangle myrectangle2 = new Rectangle();
        double area;

        myrectangle1.width = 25;
        myrectangle1.length = 35;

        myrectangle2.width = 45;
        myrectangle2.length = 95;

        area = myrectangle1.area();
        System.out.println("Area is " + area);

        area = myrectangle2.area();
        System.out.println("Area is " + area);
}
}
 
 
  

Output of this Program:

Java Program Showing Use of class having method and returns a value by Asad Hussain

Written By: Asad Hussain