java——多线程之线程安全

今天药忘吃喽~ 2023-06-06 07:59 117阅读 0赞 
  1. public class App {
  2.     public static void main(String[] args) {
  3.         ThreadSafe t=new ThreadSafe();
  4.         Thread aThread=new Thread(t);
  5.         Thread bThread=new Thread(t);
  6.         Thread cThread=new Thread(t);
  7.         Thread dThread=new Thread(t);
  9.         aThread.start();
  10.         bThread.start();
  11.         cThread.start();
  12.         dThread.start();
  13.     }
  15. }
  17. public class ThreadSafe implements Runnable{
  19.         int num=10;
  20.         public void run() {
  21.             while(true) {
  22.                 if(num>0) {
  23.                     try {
  24.                         Thread.sleep(100);
  25.                     } catch (InterruptedException e) {
  26.                         // TODO 自动生成的 catch 块
  27.                         e.printStackTrace();
  28.                     }
  29.                     System.out.println("tickets:"+num--);
  30.                 }
  31.             }
  32.         }
  34. }
  36. tickets:10
  37. tickets:9
  38. tickets:10
  39. tickets:8
  40. tickets:7
  41. tickets:6
  42. tickets:5
  43. tickets:4
  44. tickets:3
  45. tickets:3
  46. tickets:2
  47. tickets:1
  48. tickets:0
  49. tickets:-2
  50. tickets:-1
  53. //synchronized同步资源
  54. public class ThreadSafe implements Runnable{
  56.         int num=10;
  57.         public synchronized void run() {   
  58.             while(true) {
  59.                 if(num>0) {
  60.                     try {
  61.                         Thread.sleep(100);
  62.                     } catch (InterruptedException e) {
  63.                         // TODO 自动生成的 catch 块
  64.                         e.printStackTrace();
  65.                     }
  66.                     System.out.println("tickets:"+num--);
  67.                 }
  68.             }
  69. }
  71. tickets:10
  72. tickets:9
  73. tickets:8
  74. tickets:7
  75. tickets:6
  76. tickets:5
  77. tickets:4
  78. tickets:3
  79. tickets:2
  80. tickets:1

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