Example Java method that return values

In this tutorial, we will learn how to write Java methods that return values to the caller method i.e main method.  Below is an example of java code with methods that return double datatypes.

Example Java Method with void

public void readRadius() {
Scanner sc = new Scanner(System.in);
System.out.print(“Enter radius =:”);
radius=sc.nextFloat();
}

 Java method with return type

public double getPerimeter() {
perimeter = 2*Math.PI*radius;
return perimeter;
}

Java Program

The complete java program with the Java methods.

import java.util.*; 

public class JavaMethodsDemo {
  private double radius=00.0;
  private double area=0.0; 
  private double perimeter=0.0;


  /***********************************
   * This is an example of java method that doesn't
   * return anything i.e void
   ***********************************/
  public void readRadius() {
    Scanner sc = new Scanner(System.in); 
    System.out.print("Enter radius =:"); 
    radius=sc.nextFloat();
  } 


  /***********************************
   * Java method that returns area
   * to the caller of the data type double.
   ***********************************/
  public double getArea() { 
    area= Math.PI*radius*radius; 
    return area;
  } 

  /***********************************
   * Java method that returns perimeter
   * to the caller of the data type double.
   ***********************************/
  public double getPerimeter() {
    perimeter = 2*Math.PI*radius; 
    return perimeter; 
  }


  public static void main(String []args) { 
    JavaMethodsDemo area=new JavaMethodsDemo(); 
    area.readRadius(); 
    System.out.println("Area of circle :" +area.getArea()); 
    System.out.println("Perimeter of circle :" + area.getPerimeter());
  }
}

 

 

Program Output

Enter radius =:5.0
Area of circle :78.53981633974483
Perimeter of circle :31.41592653589793

Screenshot