スレッドの実験 その5

public class ThreadTest{
    public static void main(String args[]){
        Bank bnk = new Bank();

        ThreadA tha = new ThreadA(bnk);
        ThreadB thb = new ThreadB(bnk);

        tha.start();  //スレッド A 開始
        thb.start();  //スレッド B 開始

        try{
            tha.join();	//thaの終了待ち
            thb.join();	//thbの終了待ち
        }catch(Exception e){
            System.err.println(e);
            System.exit(1);
        }

        System.out.println(bnk.RefMoney());
    }
}

//Bankクラス
class Bank{
    private int Account;

    public Bank(){
        Account = 500;
    }

    public int RefMoney(){
        return Account;
    }

    public void Deposit(int d){
        Account = d;
    }
}

class ThreadA extends Thread{
    int tmp = 0;
    Bank bk;
    public ThreadA(Bank b){bk = b;}

    public void run(){

        //今回のポイント
        synchronized(bk){
            tmp = bk.RefMoney();  //参照
            try{Thread.sleep(200);}catch(Exception e){}
            tmp = tmp + 1000;     //計算
            bk.Deposit(tmp);      //格納
        }
    }
}

class ThreadB extends Thread{
    Bank bk;
    int tmp = 0;
    public ThreadB(Bank b){bk = b;}

    public void run(){
        synchronized(bk){
            tmp = bk.RefMoney();
            try{Thread.sleep(600);}catch(Exception e){}
            tmp = tmp + 2000;
            bk.Deposit(tmp);
        }
    }
}

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