java中的clone的用法

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_22708467/article/details/86586654

class A implements Cloneable {
    private int i;

    public A(int ii) {
        i = ii;
    }

    public void doublevalue() {
        i *= 2;
    }

    public String toString() {
        return Integer.toString(i);
    }

    public Object clone() {
        A o = null;
        try {
            o = (A) super.clone();
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        return o;
    }
}

class B implements Cloneable {
    public int aInt;
    public A a = new A(111);

    public Object clone() {
        B o = null;
        try {
            o = (B) super.clone();
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        o.a = (A) a.clone();
        return o;
    }
}

public class CloneMain {
    public static void main(String[] a) {
       B b1 = new B();

        b1.aInt=1;

        B b2 = (B) b1.clone();

        b2.aInt=2;
        System.out.println(b1.aInt);

        A a1 = new A(111);
        A a2= (A) a1.clone();
        a2.doublevalue();
        System.out.println(a1.toString());
    }
}