Java Program #2

Posted by AbundantCode

What is the Output of the following Java program?

RUN CODE ONLINE 
class First 
{ 
    int i = 10; 
   
    public First(int j) 
    { 
        System.out.println(i);  
        this.i = j * 10; 
    } 
} 
   
class Second extends First 
{ 
    public Second(int j) 
    { 
        super(j);  
        System.out.println(i);  
        this.i = j * 20; 
    } 
} 
   
public class MainClass 
{ 
    public static void main(String[] args) 
    { 
        Second n = new Second(20);  
        System.out.println(n.i); 
    } 
}

Output

10
200
400
Since Second class doesn't have its own "i" variable, it inherits it from the super class. Also, the constructor of Second is called when we create an object of Parent.