多线程练习,深刻体会了一次变量的BUG.

 package ltb20180106;

 public class TestBankThread {

     private int deposit=0;//注意全局变量的摆放.

     public TestBankThread() {

     }

       class BankThread implements Runnable{ 

           public BankThread() {

           }

           public void setDeposit(int money) {

               deposit+=money;

           }

           public int getMoney(int m) { 

               deposit=deposit-m;

               if(deposit<0) {

                   System.out.println("ATM余额不足!!!"+deposit);

               }

               return m;
} public int getBank() { return deposit;
} public void run() { this.setDeposit(200); System.out.println("ATM现有存款"+this.getBank()); }
} class A extends BankThread { private int a=0; public A() { } public void setA(int i) { a=a+i;
} public int getA() { return a;
} public void run() { this.setA(super.getMoney(200));
System.out.println("A从ATM取出:"+this.getA());
System.out.println("ATM现在是"+this.getBank());
this.setA(100);
System.out.println("在存入A100元最后是:"+a);
super.setDeposit(getA());
System.out.println("存入ATM后:"+super.getBank());
} } class B extends BankThread { private int b=0;//余额
private int k=0;//取款数额
public B() { } public void setB(int i) { b=b+i;
} public int getB(int j) { b=b-j; if(j>b) { System.out.println("类B:余额不足了");
} k=j; return j;
} public int getB() { return b; } public int getK() { return k;
} public void run() { this.setB(super.getMoney(300));
System.out.println("B从ATM取走"+this.getB()+"元");
this.getB(50);
super.setDeposit(this.getB());
System.out.println("B取款"+this.getK()+"元,花掉了.");
System.out.println("ATM当前存款:"+super.getBank()); } } public static void main(String[] args) { TestBankThread tb=new TestBankThread(); Thread t1=new Thread(tb.new BankThread());
t1.start();
Thread t2=new Thread(tb.new A());
t2.start();
Thread t3=new Thread(tb.new B());
t3.start(); } }

多线程练习,深刻体会了一次变量的BUG.

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