java 实现对象的克隆

java对一个对象实例实现克隆很简单的.但是有些问题需要注意,下面通过具体的例子简单讲解.

/*能够被克隆的类要实现Cloneable 接口*/
public class Sheep
    implements Cloneable {
    private String name;
    public void setName(String arg) {
        name = arg;
    }

 

    public String getName() {
        return name;
    }

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

public class MainClass()  {
    public static void main(String[] args) throws CloneNotSupportedException {
        /* 得到一个Sheep的实例*/
        Sheep first = new Sheep();
        first.setName("我是第一只羊");
        /* 通过克隆得到另外一个Sheep的实例*/
        Sheep second = (Sheep)first.clone();
        second.setName("我是另外一只羊");
        System.out.println("addr of the first : " + first);
        System.out.println("addr of the second : " + second);
       
        System.out.println("the name of the first : " + first.getName());
        System.out.println("the name of the second : " + second.getName());
}

执行结果:
 addr of the first : common.base.clone.Sheep@192d342
addr of the second : common.base.clone.Sheep@6b97fd
the name of the first : 我是第一只羊
the name of the second : 我是另外一只羊