package?com.multi; public?class?ThreadTest?implements?Runnable?{ private?Integer?ticket?=?10; private?Integer?count?=?0; private?byte[]?lock?=?new?byte[0]; public?void?run()?{ synchronized?(ticket)?{ while?(true)?{ if?(ticket?<=?-100)?{ break; } System.out.println(String.format("thread:?%s?,?tiketnum?=?%d?do?some?thing" ,Thread.currentThread().getName() ,ticket--)); count++; } } } public?static?void?main(String[]?args)?{ ThreadTest?mTh1?=?new?ThreadTest(); Thread[]?th?=?new?Thread[5]; for?(int?i?=?0;?i?<?5;?i++)?{ th[i]=?new?Thread(mTh1,"th"+i); th[i].start(); } try?{ Thread.sleep(1500); }?catch?(InterruptedException?e)?{ //?TODO?Auto-generated?catch?block e.printStackTrace(); } System.out.println(mTh1.count); } } 執行結果 thread:?th4?,?tiketnum?=?6?do?some?thing thread:?th3?,?tiketnum?=?7?do?some?thing thread:?th4?,?tiketnum?=?5?do?some?thing thread:?th3?,?tiketnum?=?4?do?some?thing thread:?th3?,?tiketnum?=?2?do?some?thing thread:?th4?,?tiketnum?=?3?do?some?thing thread:?th4?,?tiketnum?=?0?do?some?thing thread:?th4?,?tiketnum?=?-1?do?some?thing thread:?th4?,?tiketnum?=?-2?do?some?thing thread:?th4?,?tiketnum?=?-3?do?some?thing thread:?th4?,?tiketnum?=?-4?do?some?thing thread:?th4?,?tiketnum?=?-5?do?some?thing thread:?th4?,?tiketnum?=?-6?do?some?thing thread:?th4?,?tiketnum?=?-7?do?some?thing thread:?th4?,?tiketnum?=?-8?do?some?thing thread:?th1?,?tiketnum?=?9?do?some?thing …………………… …………java多線程中，鎖不起作用？