java中的克隆方法的使用(三类 浅、深、完美克隆 )

Java代码

1. package clone; //本例子阐释了clone的魅力，影子克隆
2. class UnCloneA {
3. private int i;
4. public UnCloneA(int ii) {
5. i = ii;
6. }
7. public void doublevalue() {
8. i *= 2;
9. }
10. public String toString() {
11. return Integer.toString(i); //把整数转换为字符串
12. }
13. }
15. class CloneB implements Cloneable{//实现了克隆接口 Cloneable
16. public int aInt;
17. public UnCloneAA unCA = new UnCloneAA(111);
19. public Object clone(){ //重写clone方法
20. CloneB o = null;
21. try{
22. o = (CloneB)super.clone();
23. }catch(CloneNotSupportedException e){
24. e.printStackTrace();
25. }
26. return o;
27. }
28. }
29. public class CloneMain影子克隆 {
30. public static void main(String[] a){
31. CloneB b1 = new CloneB();
32. b1.aInt = 11;
33. System.out.println("before clone,b1.aInt = "+ b1.aInt);
34. System.out.println("before clone,b1.unCA = "+ b1.unCA);
35. CloneB b2 = (CloneB)b1.clone(); //b1的克隆
36. b2.aInt = 22;
37. b2.unCA.doublevalue();
38. System.out.println("=================================");
39. System.out.println("after clone,b1.aInt = "+ b1.aInt);
40. System.out.println("after clone,b1.unCA = "+ b1.unCA);//已经被改变了
41. System.out.println("=================================");
42. System.out.println("after clone,b2.aInt = "+ b2.aInt);
43. System.out.println("after clone,b2.unCA = "+ b2.unCA);
44. }
45. }
47. /** RUN RESULT:
48. * before clone,b1.aInt = 11 before clone,b1.unCA = 111
49. * =================================
50. * after clone,b1.aInt = 11 after clone,b1.unCA = 222
51. * =================================
52. * after clone,b2.aInt = 22 after clone,b2.unCA = 222 */
55. package clone;
57. class UnCloneAA implements Cloneable{
58. private int i;
59. public UnCloneAA(int ii) {
60. i = ii;
61. }
62. public void doublevalue() {
63. i *= 2;
64. }
65. public String toString() {
66. return Integer.toString(i);
67. }
68. public Object clone(){ //深度克隆这个类也要重写这个方法
69. UnCloneAA o = null;
70. try{
71. o = (UnCloneAA)super.clone();
72. }catch(CloneNotSupportedException e){
73. e.printStackTrace();
74. }
75. return o;
76. }
77. }