1、表层克隆
- public class Snake implements Cloneable
- {
- private Snake next;
- private char c;
- Snake(int i, char x){
- c = x;
- if(--i > 0){
- next = new Snake(i,(char)(x+1));
- }
- }
- public void increment(){
- c++;
- if(next!=null){
- next.increment();
- }
- }
- public String toString(){
- String s = ":"+c;
- if(next!=null){
- s += next.toString();
- }
- return s;
- }
- public Object clone(){
- Object o = null;
- try{
- o = super.clone();
- }catch(CloneNotSupportedException e){}
- return o;
- }
- public static void main(String[] args)
- {
- Snake s = new Snake(5,'a');
- System.out.println("s ="+s);
- Snake s2 = (Snake)s.clone();
- System.out.println("s2 ="+s2);
- s2.increment();
- System.out.println("after s2.increment, s="+s+" s2 ="+s2);
- }
- }
此时的输出结果：
s =:a:b:c:d:e
s2 =:a:b:c:d:e
after s2.increment, s=:a:c:d:e:f s2 =:b:c:d:e:f
2、深层克隆
- public class Snake implements Cloneable
- {
- private Snake next;
- private char c;
- Snake(int i, char x){
- c = x;
- if(--i > 0){
- next = new Snake(i,(char)(x+1));
- }
- }
- public void increment(){
- c++;
- if(next!=null){
- next.increment();
- }
- }
- public String toString(){
- String s = ":"+c;
- if(next!=null){
- s += next.toString();
- }
- return s;
- }
- public Object clone(){
- Snake o = null;
- try{
- o = (Snake)super.clone();
- }catch(CloneNotSupportedException e){}
- if(o.next !=null)
- o.next = (Snake)o.next.clone();
- return o;
- }
- public static void main(String[] args)
- {
- Snake s = new Snake(5,'a');
- System.out.println("s ="+s);
- Snake s2 = (Snake)s.clone();
- System.out.println("s2 ="+s2);
- s2.increment();
- System.out.println("after s2.increment, s="+s);
- System.out.println("s2 ="+s2);
- }
- }
此时的输出结果为：
s =:a:b:c:d:e
s2 =:a:b:c:d:e
after s2.increment, s=:a:b:c:d:e s2 =:b:c:d:e:f
总结：
在colne()函数中，如果只是简单的调用一下父类的super.clone()则只是将当前类的基
本类型按位复制，克隆后的类所含有的对象句柄仍然和当前类相同。所以，如果需要进行深
层克隆，则需要在调用super.clone()之后，克隆该类含有的对象类。
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