동기화 synchronized

ThreadBankmain.java

package pack.thread;

public class ThreadBankMain {

public static ThreadBank myBank = new ThreadBank();

public static void main(String[] args) {

System.out.println("원금 : " + myBank.getMoney());

ThreadPark park = new ThreadPark();

ThreadParkWife wife = new ThreadParkWife();

park.start();

wife.start();

}

}

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ThreadPark.java

package pack.thread;

public class ThreadPark extends Thread{

@Override

public void run() {

ThreadBankMain.myBank.saveMoney(5000);

System.out.println("남편 입금 후 잔액 : " + ThreadBankMain.myBank.getMoney());

}

}

================================================================================================

ThreadParkWife.java

package pack.thread;

public class ThreadParkWife extends Thread{

@Override

public void run() {

ThreadBankMain.myBank.minusMoney(2000);

System.out.println("아내 출금 후 잔액 : " + ThreadBankMain.myBank.getMoney());

}

}

================================================================================================

ThreadBank.java

package pack.thread;

public class ThreadBank {

private int money = 10000; // 이거슨 공유 자원

public void setMoney(int money) {

this.money = money;

}

public int getMoney() {

return money;

}

//자원 동기화 - synchronized (실행되는 순간 락을 걸어서 해당 메소드가 끝날때까지 기다림)

public synchronized void saveMoney(int save){ //입금

int m = getMoney();

try {

Thread.sleep(2000); // 지연시간(2초 농땡이)

} catch (Exception e) {

}

setMoney(m + save);

}

public synchronized void minusMoney(int mon){ //출금

int m = getMoney();

try {

Thread.sleep(3000);

} catch (Exception e) {

}

setMoney(m - mon);

}

}