子线程业务:循环10次
主线程业务:循环20次
这两个循环(业务)需要交替执行共50次
要用到共同数据的(包括同步锁)或共同算法(加密解密)的若干个方法应该归在同一个类上，这种设计正好体现了高内聚和程序的健壮性
while (bShouldSub) {
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
中使用while防止假唤醒，使用if就不行
虚假唤醒就是一些obj.wait()会在除了obj.notify()和obj.notifyAll()的其他情况被唤醒，而此时是不应该返回的，所以要加条件判断。
synchronized (obj) {
while (<condition does not hold>)
obj.wait();
... // Perform action appropriate to condition
}
public class TraditionalThreadCommunication {
final Business business = new Business();
public static void main(String[] args) {
new TraditionalThreadCommunication().init();
}
private void init() {
new Thread(new Runnable() {
@Override
public void run() {
for (int i = 0; i <= 50; i++) {
business.sub(i);
}
}
}).start();
for (int i = 0; i <= 50; i++) {
business.main(i);
}
}
//业务对象
class Business {
private boolean bShouldSub = true;
public synchronized void sub(int i) {
while (!bShouldSub) {
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
for (int j = 1; j <= 10; j++) {
System.out.println("sub thread sequence of" + j + ",loop of "
+ i);
}
bShouldSub = false;
this.notify();
}
public synchronized void main(int i) {
while (bShouldSub) {
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
for (int j = 1; j <= 20; j++) {
System.out.println("main thread sequence of" + j + ",loop of "
+ i);
}
bShouldSub = true;
this.notify();
}
}
}
使用lock和condition改写代码
http://tianxingzhe.blog.51cto.com/3390077/1716805
本文出自 “点滴积累” 博客，请务必保留此出处http://tianxingzhe.blog.51cto.com/3390077/1716473
时间： 2024-10-30 16:08:28