【jdk源码】System.arraycopy()复制

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
    private Integer id;
    private String username;
    private String email;
}

public class SystemArrayCopy {
    public static void main(String[] args) {
        //初始化对象数组
        User[] users = new User[]{new User(1, "admin", "admin@qq.com")
                , new User(2, "maco", "maco@qq,com")
                , new User(3, "kitty", "kitty@qq,com")};
        //新建一个目标对象数组
        User[] target = new User[users.length];
        //实现复制
        System.arraycopy(users, 0, target, 0, users.length);
        System.out.println("源对象与目标对象的物理地址是否一样：" + (users[0] == target[0] ? "浅复制" : "深复制"));
        target[0].setEmail("admin@sina.com");
        System.out.println("修改目标对象的属性值后源对象users：");
        for (User user : users) {
            System.out.println(user);
        }
    }
}