Cloneable

// Interface Cloneable defined in package java.lang

/** Marker interface */
/** 实现Cloneable 接口的类标记为可克隆的，而且它的对象可以使用在
 *  Object 类中定义的clone() 方法克隆
 *  protected native Object clone() throws CloneNotSupportedException
 */

import java.util.Date;

interface Ediable {

    
}

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 Date();
    }
    
    public int getId() {

        return id;
    }
    
    public double getArea() {

        return area;
    }
    
    public Date getWhenBuilt() {

        return whenBuilt;
    }
    
    public Object clone() throws CloneNotSupportedException {

        Object o = super.clone(); // Shallow copy
        // Deep copy
        ((House) o).whenBuilt = (Date) whenBuilt.clone();
        return o;
    }
    
    public int compareTo(Object o) {

        if(area > ((House) o).area)
            return 1;
        else if(area > ((House) o).area)
            return -1;
        else
            return 0;
    }
}

public class Test {

    public static void main(String[] args) throws CloneNotSupportedException {

        House house1 = new House(1, 140);
        System.out.println(house1.getWhenBuilt());
        
        House house2 = (House) house1.clone();
        System.out.println(house2.getWhenBuilt());
        
        System.out.println(house1.getWhenBuilt() == house2.getWhenBuilt());
    }
}

Sat May 10 02:33:57 CST 2014
Sat May 10 02:33:57 CST 2014
false

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