在java中复制对象

Question

我想要在对象上执行深层复制，clone函数是否能够在此范围内工作，还是必须创建一个函数来物理复制它，并返回一个指向它的指针？也就是说，我想

Board tempBoard = board.copy(); 

这将董事会对象复制到tempBoard，其中板对象包含：

public interface Board { 
    Board copy(); 
} 

public class BoardConcrete implements Board { 
    @override 
    public Board copy() { 
     //need to create a copy function here 
    } 

    private boolean isOver = false; 
    private int turn; 
    private int[][] map; 
    public final int width, height; 


} 

Answer 1

的Cloneable接口和clone()方法设计制作对象的副本。然而，为了做一个深拷贝，你必须实现clone()自己：

public class Board { 
    private boolean isOver = false; 
    private int turn; 
    private int[][] map; 
    public final int width, height; 
    @Override 
    public Board clone() throws CloneNotSupportedException { 
     return new Board(isOver, turn, map.clone(), width, height); 
    } 
    private Board(boolean isOver, int turn, int[][] map, int width, int height) { 
     this.isOver = isOver; 
     this.turn = turn; 
     this.map = map; 
     this.width = width; 
     this.height = height; 
    } 
}