這段程式碼是一個簡單的多執行緒同時買票的案例，建立三個執行緒買票，當票數賣完後另外一個執行緒負責將票數補回到100。
附上程式碼：
public class ThreadShare {
public static void main(String[] args) {
ShareDatas shareData = new ShareDatas();
new Thread(new ThreadRunnable1(shareData)).start();
new Thread(new ThreadRunnable2(shareData)).start();
new Thread(new ThreadRunnable2(shareData)).start();
new Thread(new ThreadRunnable2(shareData)).start();
}
}
class ThreadRunnable1 implements Runnable{
private ShareDatas shareData;
public ThreadRunnable1(ShareDatas shareData){
this.shareData = shareData;
}
@Override
public void run() {
while(true){
shareData.increatment();
}
}

}
class ThreadRunnable2 implements Runnable{
private ShareDatas shareData;
public ThreadRunnable2(ShareDatas shareData){
this.shareData = shareData;
}
@Override
public void run() {
while(true){
shareData.decreatment();
}
}

}
class ShareDatas{
private static int data;
public synchronized void increatment(){
System.out.println(“票已經售完請補充”);
while(data>0){
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
data = 100;
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
this.notify();
}
public synchronized void decreatment(){
while(data<=0){
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
data–;
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()+”號視窗正在售票 “+”當前餘票是: “+data);
this.notify();
}
}
執行效果：

首先main方法建立四個執行緒，一個實現ThreadRunnable1，另外三個實現ThreadRunnable2。ThreadRunnable1和ThreadRunnable2都是共享一個ShareDatas類，並且都重寫了構造器（添加了共享引數data票數）和run（）方法。在ShareDatas類中有票數data以及對data操作的兩個方法售票的decreatment（）以及補票的increatment（）。ThreadRunnable1的run()方法中呼叫的是increatment（），ThreadRunnable2呼叫了decreatment()。