Write a ONE java program to implement the following requirements: Design 3 class

Question

Write a ONE java program to implement the following requirements: Design 3 classes: Shape8, Circle8, Square8 as below. Shape8 is an abstract class ComputeData is an interface Italicized methods mean abstract methods computeData +getDiagonal (): double -color: String -area: double +Shape8(String color) +getArea():double +setArea (area: double):void +getColor():String +compareto(o: Shape8): int +toString(): String -radius: double +Circle8(color: String, radius: double) +toString(): String ....necessary methods -width: double +Square8(color: String, width: double) +toString(): String ....necessary methods The program should be named: xxxx_lab8.java (xxxx is your email ID). Implement the necessary methods for each class. The test class xxxxx_lab8 should have a main() method that will call three methods: readData(), sort(), report(). readData() method will take 3 input records from keyboard, the input formats are as below (color, radius or width, type) For example: blue 10 circle yellow 5.5 square red 5 circle Use a Shape8 array to hold these objects. If the type is circle, create a Circle8 object to hold the data. If the type is square, create a Square8 object to hold the data. sort() method will sort the three objects' areas from low to high. report() method will print the sorted objects with the following information: a. color, area and radius for circle object. b. color, area, width, and diagonal for square object. The above test data should have the following output: Color: yellow, Area: 30.25, Width:5.5, Diagonal: 7.7781745930520225 Color: red, Area: 78.53981633974483, Radius: 5 Color: blue, Area: 314.1592653589793, Radius: 10

Explanation / Answer

Please find the .java files. Create a Java project in Eclipse 'Shape'. Then create a package 'shape' under this project and save all this files under this package. Compile and run the TestLab8.java file.

Shape8.java

package shape;

public abstract class Shape8 implements Comparable<Shape8>{

   private String color;
   private double area;
  
   public Shape8(String color){
       this.color = color;
   }
   public abstract double getArea();
  
   public void setArea(double area){
       this.area = area;
   }
   public String getColor() {
       return color;
   }

   public void setColor(String color) {
       this.color = color;
   }

   public int compareTo(Shape8 obj){
       //Comparison logic for area of different objects
       if(obj.area > this.area)
           return -1;
       else if (obj.area < this.area)
           return 1;
       else return 0;
   }
   public String toString(){
       //Providing generic output for all objects with color and area
       return "Color: "+color+", Area: "+area;
   }
}

ComputeData.java

package shape;

public interface ComputeData {

   public abstract double getDiagonal();
}

Circle8.java

package shape;

public class Circle8 extends Shape8{

   private double radius;
   public double getRadius() {
       return radius;
   }

   public void setRadius(double radius) {
       this.radius = radius;
   }

   public Circle8(String color, double radius){
       super(color);
       this.radius = radius;
       //Calculating the area of object and setting to area variable
       setArea(getArea());
   }
  
  
   @Override
   public double getArea() {
       return radius*radius*Math.PI;
   }
  
   public String toString(){
       //Appending Radius to generic output of object
       return super.toString()+", Radius: "+radius;
   }
}

Square8.java

package shape;

public class Square8 extends Shape8 implements ComputeData{

   private double width;
  
   public Square8(String color, double width){
       super(color);
       this.width = width;
       //Calculating the area of object and setting to area variable
       setArea(getArea());
   }
  
   @Override
   public double getArea() {
       return width*width;
   }

   @Override
   public double getDiagonal() {
       return Math.sqrt(width*width*2);
   }
  
   public String toString(){
       //Appending Width and Diagonal to generic output of object
       return super.toString()+", Width: "+width+", Diagonal: "+getDiagonal();
   }
}

TestLab8.java

package shape;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class TestLab8 {
  
   //To take input from keyboard
   static Scanner sc = new Scanner(System.in);
   //To store objects created from user input
       static ArrayList<Shape8> sh = new ArrayList<Shape8>();
  
   public static void readData(){
       String input;
       for (int i=0; i<3; i++){
           input = sc.nextLine();
           String ar[] = input.split(" ");
           if(ar[2].equalsIgnoreCase("circle")){
               Circle8 circle8 = new Circle8(ar[0], Double.parseDouble(ar[1]));
               sh.add(circle8);
           }else if( ar[2].equalsIgnoreCase("square")){
               Square8 square8 = new Square8(ar[0], Double.parseDouble(ar[1]));
               sh.add(square8);
           }else
               System.out.println("Invalid input");
       }      
   }
  
   public static void sort(){
       //Sorting the objects created as per the compareTo function implemented in Shape8 class
       Collections.sort(sh);
   }
   public static void report(){
       for(Shape8 shape8: sh){
           System.out.println(shape8);
       }
      
   }
   public static void main(String[] args) {
      
       readData();
       sort();
       report();
   }
}

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