171113 Thread.wait(), Thread.notify() - RYUDONGJIN/Memo_wiki GitHub Wiki

Thread.wait() , Thread.notify()

• wait()메소드가 호출되면 실행중이던 thread는 block 상태로 들어간다.
• block 상태가 된 thread는 notify()메소드를 만나면 다시 running 상태로 돌아간다.

public class practice  {
    
	private String knife = "공용 칼";
	private String board = "공용 도마";
	private boolean useAble = false;
	
    public static void main(String[] args) {
    	
    	practice p = new practice();
    	
    	Thread mother = new Thread(new Runnable() {
    		@Override
    		public void run() {
    			synchronized(p.knife) {
    				System.out.println("엄마" + p.knife + "준비완료");
    				p.useAble = true;
    				if(p.useAble) {
    					try {
							p.knife.wait();
						} catch (InterruptedException e) {
							e.printStackTrace();
						}
    				}
    				synchronized (p.board) {
    					System.out.println("엄마" + p.board + "준비완료");
    				}
    			}
    		}
    	});
    	
    	Thread son = new Thread(new Runnable() {
    		@Override
    		public void run() {
    			synchronized(p.board) {
    				System.out.println("아들" + p.board + "준비완료");
    				synchronized(p.knife) {
    					System.out.println("아들" + p.knife + "준비완료");
    					p.knife.notify();
    				}
    			}
    		}
    	});
    	mother.start();
    	son.start();
    }
}