Java多線程之並發鎖

這是自JDK5.0開始提供的Java並發包裡面的類

下面是關於Java並發鎖的測試代碼

1. package com.jadyer.thread.lock;
3. import java.util.concurrent.locks.Lock;
4. import java.util.concurrent.locks.ReentrantLock;
6. /**
7. * LockTest
8. * @author 宏宇
9. * @create Mar 1, 2012 7:12:04 PM
10. */
11. public class LockTest {
12. public static void main(String[] args) {
13. FoodCenter fc = new FoodCenter();
14. new Thread(new ThreadDog(fc, "It is dog`s food")).start();
15. new Thread(new ThreadPig(fc, "It is pig`s food")).start();
16. }
17. }
20. class ThreadDog implements Runnable{
21. private FoodCenter fc;
22. private String foodname;
23. public ThreadDog(FoodCenter fc, String foodname){
24. this.fc = fc;
25. this.foodname = foodname;
26. }
27. @Override
28. public void run() {
29. while(true){
30. try {
31. Thread.sleep(1000);
32. } catch (InterruptedException e) {
33. e.printStackTrace();
34. }
35. fc.getFood(foodname);
36. }
37. }
38. }
41. class ThreadPig implements Runnable{
42. private FoodCenter fc;
43. private String foodname;
44. public ThreadPig(FoodCenter fc, String foodname){
45. this.fc = fc;
46. this.foodname = foodname;
47. }
48. @Override
49. public void run() {
50. while(true){
51. try {
52. Thread.sleep(2000);
53. } catch (InterruptedException e) {
54. e.printStackTrace();
55. }
56. fc.getFood(foodname);
57. }
58. }
59. }
62. /**
63. * @see =========================================================================================
64. * @see java.util.concurrent是JDK5.0開始提供的Java並發包，其子包locks是專門用於處理線程鎖的
65. * @see java.util.concurrent.locks.Lock較synchronized關鍵字比，有一個最大的區別，那就是
66. * @see Lock可以比synchronized更細粒度的控制鎖，體現在try{...}finally{mylock.unlock();}
67. * @see =========================================================================================
68. * @see Lock有點像公共廁所的門闩，只有正在使用廁所的人，把門闩打開出來了，其它人才可以使用公廁
69. * @see Lock比傳統線程模型中的synchronized方式更加面向對象。與生活中的鎖類似，鎖本身也應該是一個對象
70. * @see 兩個線程執行的代碼片段要實現同步互斥的效果，那麼這兩個線程所使用的必須是同一個Lock對象
71. * @see 並且，鎖應該位於待操作��資源類的內部方法中，而非線程代碼中
72. * @see =========================================================================================
73. */
74. class FoodCenter {
75. Lock mylock = new ReentrantLock(); //創建一個鎖
76. public void getFood(String name) {
77. int len = name.length();
78. mylock.lock(); //上鎖
79. try {
80. for (int i = 0; i < len; i++) {
81. System.out.print(name.charAt(i));
82. }
83. System.out.println();
84. } finally {
85. mylock.unlock(); //解鎖
86. }
87. }
88. }