Object的克隆

克隆一个对象

public class CloneDemo implements Cloneable {
    int x;
 
    public static void main(String[] args) throws CloneNotSupportedException {
        CloneDemo cd = new CloneDemo();
        cd.x = 5;
        System.out.printf("cd.x = %d%n", cd.x);
        CloneDemo cd2 = (CloneDemo) cd.clone();
        System.out.printf("cd2.x = %d%n", cd2.x);
    }
}




class Data implements Cloneable {
    int x;
 
    @Override
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }
}
 
public class CloneDemo {
    public static void main(String[] args) throws CloneNotSupportedException {
        Data data = new Data();
        data.x = 5;
        System.out.printf("data.x = %d%n", data.x);
        Data data2 = (Data) data.clone();
        System.out.printf("data2.x = %d%n", data2.x);
    }
}


data.x = 5
data2.x = 5

浅克隆

浅克隆(也叫做浅拷贝)仅仅复制了这个对象本身的成员变量，该对象如果引用了其他对象的话，也不对其复制。

深克隆

深克隆(也叫做深复制)会复制这个对象和它所引用的对象的成员变量，如果该对象引用了其他对象，深克隆也会对其复制。