java英文(第八版)十四章答案.docx

public class Exercise14_2 { // Main method public static void main(String[] args) { // Create two comarable rects ComparableCircle circle1 = new ComparableCircle(5); ComparableCircle circle2 = new ComparableCircle(15); // Display the max rect ComparableCircle circle3 = (ComparableCircle)Max.max(circle1, circle2); System.out.println(The max circles radius is + circle3.getRadius()); System.out.println(circle3); } } class ComparableCircle extends Circle implements Comparable { /** Construct a ComparableRectangle with specified properties */ public ComparableCircle(double radius) { super(radius); } /** Implement the compareTo method defined in Comparable */ public int compareTo(Object o) { if (getRadius() ((ComparableCircle) o).getRadius()) return 1; else if (getRadius() ((ComparableCircle) o).getRadius()) return -1; else return 0; } } //Max.java: Find a maximum object class Max { /** Return the maximum of two objects */ public static Comparable max (Comparable o1, Comparable o2) { if (pareTo(o2) 0) return o1; else return o2; } } public class Exercise14_4 { /** Main method */ public static void main(String[] args) { House house1 = new House(1, 1750.50); House house2 = (House)house1.clone(); System.out.println(house1.getWhenBuilt() == house2.getWhenBuilt()); } } class House implements Cloneable, Comparable { private int id; private double area; private java.util.Date whenBuilt; public House(int id, double area) { this.id = id; this.area = area; whenBuilt = new java.util.Date(); } public double getId() { return id; } public double getArea() { return area; } public java.util.Date getWhenBuilt() { return whenBuilt; } /** Override the protected clone method defined in the Object class, and strengthen its accessibility */ public Object clone() { try { House house = (House)super.clo