Write the following generic method using selection sort and a comparator:public static <E> void selectionSort(E[] list, Comparator<? super E> comparator)Write a test program that creates an array of 10 GeometricObjects and invokes this method using the GeometricObjectComparator introduced in Listing 20.5 to sort the elements. Display the sorted elements. Use the following statement to create the array:GeometricObject[] list1 = {new Circle(5), new Rectangle(4, 5), new Circle(5.5), new Rectangle(2.4, 5), new Circle(0.5), new Rectangle(4, 65), new Circle(4.5), new Rectangle(4.4, 1), new Circle(6.5), new Rectangle(4, 5)};Also in the same program, write the code that sorts six strings by their last character. Use the following statement to create the array:String[] list2 = {"red", "blue", "green", "yellow", "orange", "pink"}; GeometricObjectComparator and GeometricObjects in pictures. public abstract class GeometricObject {private String color = "white";private boolean filled;private java.util.Date dateCreated;/** Construct a default geometric object */protected GeometricObject() {dateCreated = new java.util.Date();}/** Construct a geometric object with color and filled value */protected GeometricObject(String color, boolean filled) {dateCreated = new java.util.Date();this.color = color;this.filled = filled;}/** Return color */public String getColor() {return color;}/** Set a new color */public void setColor (String color) {this.color= color;}/** Return filled. Since filled is boolean,* the get method is named isFilled */public boolean isFilled() {return filled;}/** Set a new filled */public void setFilled (boolean filled) {this.filled = filled;}/** Get dateCreated */public java.util.Date getDateCreated() {return dateCreated;}@Overridepublic String toString() {return "created on + dateCreated + "\ncolor:and filled: " + filled;}/** Abstract method getArea */public abstract double getArea();/** Abstract method getPerimeter */public abstract double getPerimeter();}+color+ import java.util.Comparator;public class GeometricObjectComparatorjava.io.Serializable {implements Comparator,public int compare (GeometricObject o1, GeometricObject 02) {return o1.getArea() > 02.getArea() ?101.getArea()==02.getArea() ? 0 -1;}

Answered: Write the following generic method…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Write the following generic method using selection sort and a comparator:

public static <E> void selectionSort(E[] list, Comparator<? super E> comparator)

Write a test program that creates an array of 10 GeometricObjects and invokes this method using the GeometricObjectComparator introduced in Listing 20.5 to sort the elements. Display the sorted elements. Use the following statement to create the array:

GeometricObject[] list1 = {new Circle(5), new Rectangle(4, 5),
new Circle(5.5), new Rectangle(2.4, 5), new Circle(0.5),
new Rectangle(4, 65), new Circle(4.5), new Rectangle(4.4, 1),
new Circle(6.5), new Rectangle(4, 5)};

Also in the same program, write the code that sorts six strings by their last character. Use the following statement to create the array:

String[] list2 = {"red", "blue", "green", "yellow", "orange", "pink"};

GeometricObjectComparator and GeometricObjects in pictures.

public abstract class GeometricObject {
private String color = "white";
private boolean filled;
private java.util.Date dateCreated;
/** Construct a default geometric object */
protected GeometricObject() {
dateCreated = new java.util.Date();
}
/** Construct a geometric object with color and filled value */
protected GeometricObject(String color, boolean filled) {
dateCreated = new java.util.Date();
this.color = color;
this.filled = filled;
}
/** Return color */
public String getColor() {
return color;
}
/** Set a new color */
public void setColor (String color) {
this.color= color;
}
/** Return filled. Since filled is boolean,
* the get method is named isFilled */
public boolean isFilled() {
return filled;
}
/** Set a new filled */
public void setFilled (boolean filled) {
this.filled = filled;
}
/** Get dateCreated */
public java.util.Date getDateCreated() {
return dateCreated;
}
@Override
public String toString() {
return "created on + dateCreated + "\ncolor:
and filled: " + filled;
}
/** Abstract method getArea */
public abstract double getArea();
/** Abstract method getPerimeter */
public abstract double getPerimeter();
}
+color+

import java.util.Comparator;
public class GeometricObjectComparator
java.io.Serializable {
implements Comparator<GeometricObject>,
public int compare (GeometricObject o1, GeometricObject 02) {
return o1.getArea() > 02.getArea() ?
1
01.getArea()
==
02.getArea() ? 0 -1;
}

Expert Solution

Step 1

We have been given GeometricObject[] list1 = {new Circle(5), new Rectangle(4, 5),
new Circle(5.5), new Rectangle(2.4, 5), new Circle(0.5),
new Rectangle(4, 65), new Circle(4.5), new Rectangle(4.4, 1),
new Circle(6.5), new Rectangle(4, 5)}; Data for creating the array, We have to create test program that creates an array of 10 GeometricObjects and invokes this method using the GeometricObjectComparator introduced.

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