生產者和消費者多執行緒模擬
package yn.ngems.cn;
class Message{
private String title;
private String content;
private boolean flag = true;//true,生產,不消費;false,消費,不生產
public synchronized void set(String title,String content) {
if(this.flag == false) {
try {
super.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
this.title = title;
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
this.content = content;
this.flag = false;
super.notify();
}
public synchronized String get() {
if(this.flag == true) {
try {
super.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
try {
return this.title + " -- " + this.content;
}finally {
this.flag = true;
super.notify();
}
}
}
class Productor implements Runnable{
private Message msg;
public Productor(Message msg) {
this.msg = msg;
}
@Override
public void run() {
for(int x = 0;x < 50;x ++) {
if(x % 2 == 0) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
this.msg.set("AAA", "aaa");
}else {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
this.msg.set("BBBB", "bbbbbbbb");
}
}
}
}
class Consumer implements Runnable{
private Message msg;
public Consumer(Message msg) {
this.msg = msg;
}
@Override
public void run() {
for(int x = 0;x < 50;x ++) {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(this.msg.get());
}
}
}
public class ThreadDemo {
public static void main(String[] args) {
Message msg = new Message();
new Thread(new Productor(msg)).start();
new Thread(new Consumer(msg)).start();
}
}
思路:Message類是生產者和消費者的連結,從初次的簡單Java類來做,會出現很多問題,一步步分析,資料是否同步,鎖機制,生產和消費不能同時進行,需要有等待,設定開關進行等待判斷和喚醒,增加休眠時間,為了更好的展現問題所在。