Using inheritance, one class can acquire the properties of others.

 Using inheritance, one class can acquire the properties of others. Consider the following Animal class:

class Animal{
    void walk(){
        System.out.println("I am walking");
    }
}

This class has only one method, walk. Next, we want to create a Bird class that also has a fly method. We do this using extends keyword:

class Bird extends Animal {
    void fly() {
        System.out.println("I am flying");
    }
}

Finally, we can create a Bird object that can both fly and walk.

public class Solution{
   public static void main(String[] args){

      Bird bird = new Bird();
      bird.walk();
      bird.fly();
   }
}

The above code will print:

I am walking
I am flying

This means that a Bird object has all the properties that an Animal object has, as well as some additional unique properties.

The code above is provided for you in your editor. You must add a sing method to the Bird class, then modify the main method accordingly so that the code prints the following lines:

I am walking
I am flying
I am singing 


SOLUTION :

import java.io.*;
import java.util.*;

class Animal{
    public static void walk(){
        System.out.println("I am walking");
    }
}
class Bird extends Animal{
    public static void fly(){
        System.out.println("I am flying");
        System.out.println("I am singing");
    }
}
public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Bird n=new Bird();
        n.walk();
        n.fly();
    }
}
Location: Khardi, Shop No 1, Rakshak Nagar, Kharadi, Pune, Maharashtra 411014, India

Popular posts from this blog

When a method in a subclass overrides a method in superclass, it is still possible to call the overridden method using super keyword - Hacker Rank Solution.

When a method in a subclass overrides a method in superclass, it is still possible to call the overridden method using   super   keyword. If you write   super.func()   to call the function   func() , it will call the method that was defined in the superclass. You are given a partially completed code in the editor. Modify the code so that the code prints the following text: Hello I am a motorcycle, I am a cycle with an engine. My ancestor is a cycle who is a vehicle with pedals. SOLUTION : - import java.io.*; import java.util.*; class Cycle {     String define_me() {         return "a vehicle with pedals." ;     } } class Motorcycle extends Cycle {     @Override     String define_me() {         return "a cycle with an engine." ;     }     Motorcycle() {         System.out.println( "Hello I am a motorcycle, I am " + define_me());   ...
Read more

You are given a date. You just need to write the method getDay which returns the day on that date - Hacker Rank Solution.

Image
The  Calendar class   is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week. You are given a date. You just need to write the method,  , which returns the  day  on that date. To simplify your task, we have provided a portion of the code in the editor. Function Description Complete the  findDay  function in the editor below. findDay  has the following parameters: int:  month int:  day int:  year Returns string:  the day of the week in capital letters Input Format A single line of input containing the space separated month, day and year, respectively, in   MM DD YYYY    format. Sample Input 08 05 2015 Sample Output WEDNESDAY Explanation The day on August 5 th  2015 was  WEDNESDAY . SOLUTION :...
Read more

Java's System.out.printf function can be used to print formatted output. The purpose of this exercise is to test your understanding of formatting output using printf. To get you started, a portion of the solution is provided for you in the editor; you must format and print the input to complete the solution.

  Input Format Every line of input will contain a  String  followed by an  integer . Each  String  will have a maximum of   alphabetic characters, and each  integer  will be in the inclusive range from   to  . Output Format In each line of output there should be two columns: The first column contains the  String  and is left justified using exactly   characters. The second column contains the  integer , expressed in exactly   digits; if the original input has less than three digits, you must pad your output's leading digits with zeroes. Sample Input java 100 cpp 65 python 50 Sample Output ================================ java 100 cpp 065 python 050 ================================ Solution: import java.util.Scanner; public class Solution {     public static void main(String[] args) {             ...
Read more