同步方法里面可以调用非同步方法

  2. public class T1 {
  4.     // 示例演示同步方法和非同步方法同时调用
  5.     synchronized void m() {
  6.         System.out.println("synchronized method" + new Date());
  7.         n();
  8.     }
  10.     void n() {
  11.         System.out.println("not synchronized method" + new Date());
  12.     }
  14.     public static void main(String[] args) throws InterruptedException {
  15.         CountDownLatch start = new CountDownLatch(1);
  16.         CountDownLatch end = new CountDownLatch(10);
  18.         T1 t = new T1();
  19.         for (int i = 0; i < 10; i++) {
  20.             new Thread(() -> {
  21.                 try {
  22.                     start.await();
  23.                     t.m();
  24.                 } catch (InterruptedException e) {
  25.                     e.printStackTrace();
  26.                 } finally {
  27.                     end.countDown();
  28.                 }
  29.             }).start();
  30.         }
  31.         start.countDown();
  32.         end.await();
  33.     }
  34. }
  36. 输出结果：
  37. synchronized methodThu Oct 29 13:43:37 CST 2020
  38. not synchronized methodThu Oct 29 13:43:37 CST 2020
  39. synchronized methodThu Oct 29 13:43:37 CST 2020
  40. not synchronized methodThu Oct 29 13:43:37 CST 2020
  41. synchronized methodThu Oct 29 13:43:37 CST 2020
  42. not synchronized methodThu Oct 29 13:43:37 CST 2020
  43. synchronized methodThu Oct 29 13:43:37 CST 2020
  44. not synchronized methodThu Oct 29 13:43:37 CST 2020
  45. synchronized methodThu Oct 29 13:43:37 CST 2020
  46. not synchronized methodThu Oct 29 13:43:37 CST 2020
  47. synchronized methodThu Oct 29 13:43:37 CST 2020
  48. not synchronized methodThu Oct 29 13:43:37 CST 2020
  49. synchronized methodThu Oct 29 13:43:37 CST 2020
  50. not synchronized methodThu Oct 29 13:43:37 CST 2020
  51. synchronized methodThu Oct 29 13:43:37 CST 2020
  52. not synchronized methodThu Oct 29 13:43:37 CST 2020
  53. synchronized methodThu Oct 29 13:43:37 CST 2020
  54. not synchronized methodThu Oct 29 13:43:37 CST 2020
  55. synchronized methodThu Oct 29 13:43:37 CST 2020
  56. not synchronized methodThu Oct 29 13:43:37 CST 2020

同步方法和非同步方法可同时调用

  1. public class T1 {
  4.     // 示例演示同步方法和非同步方法同时调用
  5.     synchronized void m() {
  6.         System.out.println("synchronized method" + new Date());
  7.     }
  9.     void n() {
  10.         System.out.println("not synchronized method" + new Date());
  11.     }
  13.     public static void main(String[] args) throws InterruptedException {
  14.         CountDownLatch start = new CountDownLatch(1);
  15.         CountDownLatch end = new CountDownLatch(10);
  17.         T1 t = new T1();
  18.         for (int i = 0; i < 10; i++) {
  19.             new Thread(() -> {
  20.                 try {
  21.                     start.await();
  22.                     t.m();
  23.                     t.n();
  24.                 } catch (InterruptedException e) {
  25.                     e.printStackTrace();
  26.                 } finally {
  27.                     end.countDown();
  28.                 }
  29.             }).start();
  30.             new Thread(() -> {
  31.                 try {
  32.                     start.await();
  33.                     t.m();
  34.                     t.n();
  35.                 } catch (Exception e) {
  36.                     e.printStackTrace();
  37.                 } finally {
  38.                     end.countDown();
  39.                 }
  40.             }).start();
  41.         }
  42.         start.countDown();
  43.         end.await();
  44.     }
  45. }
  47. 输出结果
  48. synchronized methodThu Oct 29 13:44:28 CST 2020
  49. not synchronized methodThu Oct 29 13:44:28 CST 2020
  50. synchronized methodThu Oct 29 13:44:28 CST 2020
  51. not synchronized methodThu Oct 29 13:44:28 CST 2020
  52. synchronized methodThu Oct 29 13:44:28 CST 2020
  53. not synchronized methodThu Oct 29 13:44:28 CST 2020
  54. synchronized methodThu Oct 29 13:44:28 CST 2020
  55. not synchronized methodThu Oct 29 13:44:28 CST 2020
  56. synchronized methodThu Oct 29 13:44:28 CST 2020
  57. not synchronized methodThu Oct 29 13:44:28 CST 2020
  58. synchronized methodThu Oct 29 13:44:28 CST 2020
  59. not synchronized methodThu Oct 29 13:44:28 CST 2020
  60. synchronized methodThu Oct 29 13:44:28 CST 2020
  61. not synchronized methodThu Oct 29 13:44:28 CST 2020
  62. synchronized methodThu Oct 29 13:44:28 CST 2020
  63. not synchronized methodThu Oct 29 13:44:28 CST 2020
  64. synchronized methodThu Oct 29 13:44:28 CST 2020
  65. not synchronized methodThu Oct 29 13:44:28 CST 2020
  66. synchronized methodThu Oct 29 13:44:28 CST 2020
  67. not synchronized methodThu Oct 29 13:44:28 CST 2020
  68. synchronized methodThu Oct 29 13:44:28 CST 2020
  69. not synchronized methodThu Oct 29 13:44:28 CST 2020
  70. synchronized methodThu Oct 29 13:44:28 CST 2020
  71. not synchronized methodThu Oct 29 13:44:28 CST 2020
  72. synchronized methodThu Oct 29 13:44:28 CST 2020
  73. not synchronized methodThu Oct 29 13:44:28 CST 2020
  74. synchronized methodThu Oct 29 13:44:28 CST 2020
  75. not synchronized methodThu Oct 29 13:44:28 CST 2020
  76. synchronized methodThu Oct 29 13:44:28 CST 2020
  77. not synchronized methodThu Oct 29 13:44:28 CST 2020
  78. synchronized methodThu Oct 29 13:44:28 CST 2020
  79. not synchronized methodThu Oct 29 13:44:28 CST 2020
  80. synchronized methodThu Oct 29 13:44:28 CST 2020
  81. not synchronized methodThu Oct 29 13:44:28 CST 2020
  82. synchronized methodThu Oct 29 13:44:28 CST 2020
  83. not synchronized methodThu Oct 29 13:44:28 CST 2020
  84. synchronized methodThu Oct 29 13:44:28 CST 2020
  85. not synchronized methodThu Oct 29 13:44:28 CST 2020
  86. synchronized methodThu Oct 29 13:44:28 CST 2020
  87. not synchronized methodThu Oct 29 13:44:28 CST 2020