线程死锁情况和while在线程的作用

public class printDemo04 {
    public static void main(String[] args) {
        Resource01 resource01 = new Resource01();
        Producer producer = new Producer(resource01);
        Producers  producers = new Producers(resource01);
        Thread thread0 = new Thread(producer);
        Thread thread1 = new Thread(producer);
        Thread thread2 = new Thread(producers);
        Thread thread3 = new Thread(producers);
        thread0.start();
        thread1.start();
        thread2.start();
        thread3.start();
    }
}
class Resource01{
    private String name;
    private int sex = 1;
    private boolean flag = false;
    public synchronized void setSth(String name){
        while(flag){
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        this.name = name+sex;
        sex++;
        System.out.println(Thread.currentThread().getName()+"----"+"生产者..."+this.name);
        flag = true;
        this.notifyAll();
    }
    
    public synchronized void getSth(){
        while(!flag){
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println(Thread.currentThread().getName()+"--"+"消费者..."+name);
        flag = false;
        this.notifyAll();
    }
}
class Producer implements Runnable{
    Resource01 resource01;
    public Producer(Resource01 resource01) {
        this.resource01 = resource01;
    }
    int i = 1;
    @Override
    public void run() {
        while(true){
            if(i==1){
                resource01.setSth("烤鸭");
            }
            i = (i+1)%2;
        }
    }
}
class Producers implements Runnable{
    Resource01 resource01;
    public Producers(Resource01 resource01) {
        this.resource01 = resource01;
    }
    
    @Override
    public void run() {
        while(true){
            resource01.getSth();
        }
    }
}