java实现对象的浅复制与深复制

约定不等于承诺〃 2023-07-05 13:26 5阅读 0赞

浅复制：只对对象以及变量值进行复制，引用对象地址不变
    深复制：不仅对对象以及变量值进行复制，对引用对象也复制

import java.io.*;
    
    /**
     * 实现对象的浅复制与深复制
     */
    public class Dancer implements Cloneable, Serializable {
    
        private static final long serialVersionUID = -5429953184638265377L;
    
        private String name;
        private Dancer partner;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public Dancer getPartner() {
            return partner;
        }
    
        public void setPartner(Dancer partner) {
            this.partner = partner;
        }
    
        public Dancer deepClone() {
            Dancer target = null;
            byte[] byteArr = null;
            try(
                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
                    ObjectOutputStream oos = new ObjectOutputStream(baos);
            ) {
                oos.writeObject(this);
                byteArr = baos.toByteArray();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try(
                    ByteArrayInputStream bais = new ByteArrayInputStream(byteArr);
                    ObjectInputStream ois = new ObjectInputStream(bais);
            ) {
                target = (Dancer) ois.readObject();
    
            } catch (IOException | ClassNotFoundException e) {
                e.printStackTrace();
            }
            return target;
        }
    
        public static void main(String[] args) throws CloneNotSupportedException {
            Dancer d1 = new Dancer();
            d1.setName("朱明远");
            Dancer d2 = new Dancer();
            d2.setName("刘敏霞");
            d1.setPartner(d2);
            System.out.println("Partner:" + d2.hashCode());
            //浅复制
            Dancer shallow = (Dancer) d1.clone();
            System.out.println("浅复制:" + shallow.getPartner().hashCode());
            //深复制
            Dancer deep = d1.deepClone();
            System.out.println("深复制:" + deep.getPartner().hashCode());
        }
    }

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[2020021515585959.jpg]: https://img-blog.csdnimg.cn/2020021515585959.jpg