Thread synchronization(스레드 동기화)

package com.basic;//스레드 동기화 Synchronized

class ATM implements Runnable{
	//공유 자원
	private long depositeMoney = 10000;
	public void run(){
		synchronized (this){
			for(int i=0;i<5;i++){
				try{
					Thread.sleep(1000);
				}catch(InterruptedException e){
					e.printStackTrace();
				}
				if(getDepositeMoney() <= 0)
					break;
				//임계 영역 : 공유자원을 변경하는 코드영역
				withDraw(1000);
			}
		}
	}
	public void withDraw(long howMuch){
		if(getDepositeMoney()>0){
			depositeMoney -= howMuch;
			System.out.println(Thread.currentThread().getName()+" , "+getDepositeMoney());
		}else{
			System.out.print(Thread.currentThread().getName()+" , ");
			System.out.println("잔액이 부족하다");
		}
	}
	public long getDepositeMoney(){
		return depositeMoney;
	}
}
public class SynchronizedEx {
	public static void main(String[] args) {
		ATM atm = new ATM();
		Thread mother = new Thread(atm,"mother");
		Thread son = new Thread(atm,"son");
		mother.start();
		son.start();
	}
}

mother , 9000

mother , 8000

mother , 7000

mother , 6000

mother , 5000

son , 4000

son , 3000

son , 2000

son , 1000

son , 0