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多线程练习,深刻体会了一次变量的BUG.

  1 package ltb20180106;
  2 
  3 public class TestBankThread {
  4     
  5     private int deposit=0;//注意全局变量的摆放.
  6     
  7     public TestBankThread() {
  8         
  9         
 10     }
 11 
 12      
 13     
 14       class BankThread implements Runnable{ 
 15           
 16          
 17           
 18           public BankThread() {
 19               
 20               
 21           }
 22           
 23           public void setDeposit(int money) {
 24               
 25               deposit+=money;
 26               
 27           }
 28           
 29           public int getMoney(int m) { 
 30               
 31               deposit=deposit-m;
 32               
 33               if(deposit<0) {
 34                   
 35                   System.out.println("ATM余额不足!!!"+deposit);
 36                   
 37               }
 38               
 39               return m;
 40           }
 41           
 42           public int getBank() {
 43               
 44               return deposit;
 45           }
 46           
 47           public void run() {
 48               
 49               this.setDeposit(200);
 50             
 51               System.out.println("ATM现有存款"+this.getBank());
 52               
 53               
 54             
 55           }
 56       }
 57 
 58      class A extends BankThread {
 59          
 60          private int a=0;
 61          
 62          public A() {
 63              
 64          }
 65          
 66          public void setA(int i) {
 67              
 68              a=a+i;
 69          }
 70          
 71          public int getA() {
 72              
 73              return a;
 74          }
 75          
 76          
 77          public void run() {
 78              
 79              this.setA(super.getMoney(200));
 80              System.out.println("A从ATM取出:"+this.getA());
 81              System.out.println("ATM现在是"+this.getBank());
 82              this.setA(100);
 83              System.out.println("在存入A100元最后是:"+a);
 84              super.setDeposit(getA());  
 85              System.out.println("存入ATM后:"+super.getBank());
 86          }
 87          
 88      }
 89     
 90      class B  extends BankThread {
 91          
 92          private int b=0;//余额
 93          private int k=0;//取款数额
 94          public B() {
 95              
 96          }
 97          
 98        public void setB(int i) {
 99              
100              b=b+i;
101          }
102          
103        public int getB(int j) {
104           
105            b=b-j;
106            
107            if(j>b) {
108                  
109                System.out.println("类B:余额不足了");
110            }
111            
112             k=j;
113             
114            return j;
115        }
116        
117          public int getB() {
118              
119              return b;
120              
121          }
122          
123          public int getK() {
124              
125              return k;
126          }
127          
128          public void run() {
129              
130             this.setB(super.getMoney(300));
131             System.out.println("B从ATM取走"+this.getB()+"元");
132             this.getB(50);
133             super.setDeposit(this.getB());
134             System.out.println("B取款"+this.getK()+"元,花掉了.");
135             System.out.println("ATM当前存款:"+super.getBank());
136              
137          }
138          
139         
140         
141      }
142     
143     public static void main(String[] args) {
144         
145      TestBankThread tb=new TestBankThread();
146      
147        Thread t1=new Thread(tb.new BankThread());
148         t1.start();
149        Thread t2=new Thread(tb.new A());
150        t2.start();
151        Thread t3=new Thread(tb.new B());
152         t3.start();
153        
154     }
155 
156 }

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原文地址：https://www.cnblogs.com/ltb6w/p/8470582.html