1.在类中方法上加上
synchronized关键字，是对整个对象加锁，当一个线程访问带有synchronized的方法时，其他带有synchronized的方法的访问就都会阻塞。
样例：
public class ThreadTest { public static void main(String[] args) { Stu stu = new Stu(); StuThread1 t1 = new StuThread1(stu); t1.start(); StuThread2 t2 = new StuThread2(stu); t2.start(); } } class StuThread1 extends Thread { Stu stu; public StuThread1(Stu stu) { this.stu = stu; } public void run() { stu.read1(); } } class StuThread2 extends Thread { Stu stu; public StuThread2(Stu stu) { this.stu = stu; } public void run() { stu.read2(); } } class Stu { public synchronized void read1() { System.out.println("read1 begin"); try { Thread.currentThread().sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("read1 end"); } public synchronized void read2() { System.out.println("read2 begin"); try { Thread.currentThread().sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("read2 end"); } } |
