有時候創建對象是需要耗費很多資源，但是每個對象之間又有大量的重復。我們可以選擇在創建好一個對象後，以之作為模板克隆出其他對象，稍作修改，即可用於其他地方。

需要實現Cloneable接口，重寫clone()方法。其實就是調用的Object類的clone()方法。

克隆對象只是復制了原對象的數據，每個對象還是獨立的，他們的內存地址不同。

/**
 * Created by wangbin10 on 2018/5/18.
 */
public class Prototype2 implements Cloneable,Serializable {
    private static final long
 
 serialVersionUID = 2L;
    private String name;
    private Integer payAmount;
    private String msg;

    public Prototype2() {
    }

    public Prototype2(String name, Integer payAmount, String msg) {
        this.name = name;
        this.payAmount = payAmount;
        this.msg = msg;
    }

    
 
public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getPayAmount() {
        return payAmount;
    }

    public void setPayAmount(Integer payAmount) {
        this.payAmount = payAmount;
    }

    public String getMsg() {
        
 
return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public Prototype2 clone() throws CloneNotSupportedException {
        Prototype2 clone = (Prototype2) super.clone();
        return clone;
    }
}

/**
 * Created by wangbin10 on 2018/5/18.
 */
public class PTest {
    public static void main(String[] args) throws CloneNotSupportedException {
        Prototype2 p1=new Prototype2("zhangsan",23,"hello!welcome to beijing!");
        System.out.println(p1.getName()+p1.getPayAmount()+p1.getMsg());
        Prototype2 p2 = p1.clone();
        p2.setName("lisi");
        p2.setPayAmount(24);
        System.out.println(p2.getName()+p2.getPayAmount()+p2.getMsg());
        System.out.println("============================");
        System.out.println(p1.getName()+p1.getPayAmount()+p1.getMsg());

    }
}

java設計模式-原型（prototype）