Boolean flag=false；为啥!flag为false，flag为true

public class Queue {

private int n;

boolean flag=false;

public synchronized int get() {

if(!flag){

try {

wait();

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

System.out.println("消费："+n);

return n;

}

public synchronized void set(int n) {

if(flag){

try {

wait();

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

System.out.println("生产："+n);

this.n = n;

}

}