How to Use Overloaded Java Constructors

1. How to Use Overloaded Java Constructors The example below shows a class with an overloaded constructor: Java > cat Rectangle.java class Rectangle { double width; double height; Rectangle() { width = 2; height = 3; } Rectangle(double w, double h) { width = w; height = h; } } Java > javac Rectangle.java Java > If you have a class like this, when you create members, you have a choice. You can accept the default settings or you can override them by supplying parameters. In the example below, r1 takes

2. the default settings whereas r2 uses parameters to change the width to 4 and the height to 5: Java > cat RectangleExample.java public class RectangleExample { public static void main(String args[]) { Rectangle r1 = new Rectangle(); System.out.println(“r1 width = ” + r1.width); System.out.println(“r1 height = ” + r1.height); Rectangle r2 = new Rectangle(4,5); System.out.println(“r2 width = ” + r2.width); System.out.println(“r2 height = ” + r2.height); } } Java > javac RectangleExample.java Java > java RectangleExample r1 width = 2.0 r1 height = 3.0 r2 width = 4.0 r2 height = 5.0 Source : How to Use Overloaded Java Constructors