Constructor Overloading

Constructor Overloading:

• Constructor overloading is a technique in Java in which a class can have any number of constructors that differ in parameter lists.
• The compiler differentiates these constructors by taking into account the number of parameters in the list and their type.

Example for Constructor Overloading:

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public class ConstructorOverloadingExample {
 int x;
 int y;
 int z;

  public ConstructorOverloadingExample() {
   x = 1;  
   y = 1;  
   z = 1;
  }

  public ConstructorOverloadingExample(int a, int b) {
   x = a;
   y = b;
   z = 1;
 }

 public ConstructorOverloadingExample(int a, int b, int c) {
  x = a;
  y = b;
  z = c;
 }

 public ConstructorOverloadingExample(int a) {
  x = a;
  y = 1;
  z = 1;
 }

 public int getIntValues() {
  return x * y * z;
 }

 public static void main(String a[]) {
  ConstructorOverloadingExample i = new ConstructorOverloadingExample();
  ConstructorOverloadingExample j = new ConstructorOverloadingExample(10);
  ConstructorOverloadingExample k = new      
  ConstructorOverloadingExample(10,20, 30);
  ConstructorOverloadingExample l = new ConstructorOverloadingExample(10, 
  20);
  int q;
  q = i.getIntValues();
  System.out.println("area of room i is "+ q);
  q = j.getIntValues();
  System.out.println("area of room j is "+ q);
  q = k.getIntValues();
  System.out.println("area of room k is "+ q);
  q = l.getIntValues();
  System.out.println("area of room l is "+ q);
 }

}

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In this example we have created four constructors with different number of input parameters. This is constructor over loading.