Java线程同步锁的选择

Java线程同步锁的选择 public class SyncTest { private String name = "name"; public void method(String flag) { synchronized (name) { System.out.println(flag + ", invoke method ...."); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } public static void main(String[] args) { SyncTest test1 = new SyncTest(); SyncTest test2 = new SyncTest(); MyThread1 myThread1 = new MyThread1(); MyThread1 myThread2 = new MyThread1(); myThread1.syncTest = test1; myThread2.syncTest = test1; MyThread1 myThread3 = new MyThread1(); MyThread1 myThread4 = new MyThread1(); myThread3.syncTest = test2; myThread4.syncTest = test2; myThread1.start(); myThread2.start(); myThread3.start(); myThread4.start(); } } ?ß?????? public class MyThread1 extends Thread { SyncTest syncTest; @Override public void run() { syncTest.method(this.getName()); } }????Ó?ø??ē???µ?Ö?ß??thread1??thread2???,???ß??thread3??thread4??? ,µÄ??µ?,??ūÄ??æ package com.rcx.thread; public class SyncTest { // ???āµÄinstance?ä?æ,Ó?Ó??äµ????,??µÄ?ō?ó private byte[] lock = new byte[0]; public void method(String flag) { synchronized (lock) { System.out.println(flag + ", invoke method f...."); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } public static void main(String[] args) { SyncTest test1 = new SyncTest(); SyncTest test2 = new SyncTest(); MyThread1 myThread1 = new MyThread1(); MyThread1 myThread2 = new MyThread1(); myThread1.syncTest = test1; myThread2.syncTest = test1; MyThread1 myThread3 = new MyThread1(); MyThread1 myThread4 = new MyThread1(); myThread3.syncTest = test2; myThread4.syncTest = test2; myThread1.start(); myThread2.start(); myThread3.start(); myThread4.start(); }