JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Java Constructor Chaining Examples

Calling another constructor in the same class from another constructor is called constructor chaining. By using this() we can call another constructor in the same class. Incase we want to call another constructor, this() should be the first line in the constructor. Below example shows code for constructor chaining.

Java Constructor Chaining Sample Code

Code:
package com.myjava.constructors;

public class MyChaining {
    
    public MyChaining(){
        System.out.println("In default constructor...");
    }
    public MyChaining(int i){
        this();
        System.out.println("In single parameter constructor...");
    }
    public MyChaining(int i,int j){
        this(j);
        System.out.println("In double parameter constructor...");
    }
    
    public static void main(String a[]){
        MyChaining ch = new MyChaining(10,20);
    }
}

Example Output

In default constructor...
In single parameter constructor...
In double parameter constructor...

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Other Constructor Examples

Knowledge Centre
What is abstract class or abstract method?
We cannot create instance for an abstract class. We can able to create instance for its subclass only. By specifying abstract keyword just before class, we can make a class as abstract class.

public abstract class MyAbstractClass{

}

Abstract class may or may not contains abstract methods. Abstract method is just method signature, it does not containes any implementation. Its subclass must provide implementation for abstract methods. Abstract methods are looks like as given below:

public abstract int getLength();

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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