Java Object Clone

標籤：ret   int   rop   sys   name   prope   use   注意   over   

Java Object Clone

        User user = new User();        user.setName("tom");        User user1 = new User();        user1.setName("jerry");        List<User> list = new ArrayList<>();        list.add(user1);        user.setChildren(list);        user.setUser(user1);        System.out.println(user);        User2 user2 = new User2();        BeanUtils.copyProperties(user2,user);        System.out.println(user2);        List<User2> children = user2.getChildren();        // 此處會出現錯誤        for (User2 user21 :children  ) {            System.out.println(user21);        }        User user3 = (User) BeanUtils.cloneBean(user);        System.out.println(user3);

user:

package com.test;import java.util.List;public class User {    private String name;    private List<User> children;    private User user;    public User getUser() {        return user;    }    public void setUser(User user) {        this.user = user;    }    @Override    public String toString() {        return "User{" +                "name=‘" + name + ‘\‘‘ +                ", children=" + children +                ", user=" + user +                ‘}‘;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public List<User> getChildren() {        return children;    }    public void setChildren(List<User> children) {        this.children = children;    }}

user2:

package com.test;import java.util.List;public class User2 {    private String name;    private List<User2> children;    private User2 user2;    public User2 getUser2() {        return user2;    }    public void setUser2(User2 user2) {        this.user2 = user2;    }    @Override    public String toString() {        return "User2{" +                "name=‘" + name + ‘\‘‘ +                ", children=" + children +                ", user2=" + user2 +                ‘}‘;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public List<User2> getChildren() {        return children;    }    public void setChildren(List<User2> children) {        this.children = children;    }}

 

注意和spring beanutils的區別：

72961383/

傳說spring Beanutils的效能要更好一些；

 

Java Object Clone