多线程共享数据

public class MultiThreadShareData {


private static ShareData1 data1 = new ShareData1();

public static void main(String[] args) {
ShareData1 data2 = new ShareData1();
new Thread(new MyRunnable1(data2)).start();
new Thread(new MyRunnable2(data2)).start();

final ShareData1 data1 = new ShareData1();
new Thread(new Runnable(){
@Override
public void run() {
data1.decrement();

}
}).start();
new Thread(new Runnable(){
@Override
public void run() {
data1.increment();

}
}).start();


}


}

class MyRunnable1 implements Runnable{
private ShareData1 data1;
public MyRunnable1(ShareData1 data1){
this.data1 = data1;
}
public void run() {
data1.decrement();

}
}

class MyRunnable2 implements Runnable{
private ShareData1 data1;
public MyRunnable2(ShareData1 data1){
this.data1 = data1;
}
public void run() {
data1.increment();
}
}


class ShareData1 /*implements Runnable*/{
/* private int count = 100;
@Override
public void run() {
// TODO Auto-generated method stub
while(true){
count--;
}
}*/


private int j = 0;
public synchronized void increment(){
j++;
}

public synchronized void decrement(){
j--;
}
}