Java删除集合中的元素常见方法汇总

Java代码如下：

1. 
   
2. 
   
3. public static void main(String[] args) {
   
4. removeItem1();
   
5. removeItem2();
   
6. removeItem3();
   
7. }
   
8. 
   
9. private static void removeItem1() {
   
10. List<Integer> list = getList();
    
11. // 使用迭代器
    
12. Iterator<Integer> iter = list.iterator();
    
13. Integer item = null;
    
14. while (iter.hasNext()) {
    
15. item = iter.next();
    
16. if (null != item && 5 == item.intValue()) {
    
17. iter.remove();
    
18. }
    
19. }
    
20. System.out.println(list);
    
21. }
    
22. 
    
23. private static void removeItem2() {
    
24. List<Integer> list = getList();
    
25. // 手动索引操作
    
26. int len = list.size();
    
27. Integer item = null;
    
28. for (int i = 0;i < len;i++) {
    
29. item = list.get(i);
    
30. if (null != item && 5 == item.intValue()) {
    
31. list.remove(item);
    
32. i--;
    
33. len--;
    
34. }
    
35. }
    
36. System.out.println(list);
    
37. }
    
38. 
    
39. private static void removeItem3() {
    
40. List<Integer> list = getList();
    
41. // 使用引用克隆
    
42. List<Integer> listCopy = new ArrayList<Integer>();
    
43. listCopy.addAll(list);
    
44. for (Integer item:list) {
    
45. if (null != item && 5 == item.intValue()) {
    
46. listCopy.remove(item);
    
47. }
    
48. }
    
49. System.out.println(listCopy);
    
50. }
    
51. 
    
52. private static List<Integer> getList() {
    
53. List<Integer> list = new ArrayList<Integer>();
    
54. for (int i = 0;i < 10;i++) {
    
55. list.add(i);
    
56. }
    
57. return list;
    
58. }
    
59. }
    
60. 
    
61. Java代码运行结果：
    
62. 
    
63. [0, 1, 2, 3, 4, 6, 7, 8, 9]
    
64. [0, 1, 2, 3, 4, 6, 7, 8, 9]
    
65. [0, 1, 2, 3, 4, 6, 7, 8, 9]

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Java删除集合中的元素常见方法汇总

Java代码如下：

1. 
   
2. 
   
3. public static void main(String[] args) {
   
4. removeItem1();
   
5. removeItem2();
   
6. removeItem3();
   
7. }
   
8. 
   
9. private static void removeItem1() {
   
10. List<Integer> list = getList();
    
11. // 使用迭代器
    
12. Iterator<Integer> iter = list.iterator();
    
13. Integer item = null;
    
14. while (iter.hasNext()) {
    
15. item = iter.next();
    
16. if (null != item && 5 == item.intValue()) {
    
17. iter.remove();
    
18. }
    
19. }
    
20. System.out.println(list);
    
21. }
    
22. 
    
23. private static void removeItem2() {
    
24. List<Integer> list = getList();
    
25. // 手动索引操作
    
26. int len = list.size();
    
27. Integer item = null;
    
28. for (int i = 0;i < len;i++) {
    
29. item = list.get(i);
    
30. if (null != item && 5 == item.intValue()) {
    
31. list.remove(item);
    
32. i--;
    
33. len--;
    
34. }
    
35. }
    
36. System.out.println(list);
    
37. }
    
38. 
    
39. private static void removeItem3() {
    
40. List<Integer> list = getList();
    
41. // 使用引用克隆
    
42. List<Integer> listCopy = new ArrayList<Integer>();
    
43. listCopy.addAll(list);
    
44. for (Integer item:list) {
    
45. if (null != item && 5 == item.intValue()) {
    
46. listCopy.remove(item);
    
47. }
    
48. }
    
49. System.out.println(listCopy);
    
50. }
    
51. 
    
52. private static List<Integer> getList() {
    
53. List<Integer> list = new ArrayList<Integer>();
    
54. for (int i = 0;i < 10;i++) {
    
55. list.add(i);
    
56. }
    
57. return list;
    
58. }
    
59. }
    
60. 
    
61. Java代码运行结果：
    
62. 
    
63. [0, 1, 2, 3, 4, 6, 7, 8, 9]
    
64. [0, 1, 2, 3, 4, 6, 7, 8, 9]
    
65. [0, 1, 2, 3, 4, 6, 7, 8, 9]

复制代码