personalinfotest.java

金旭亮的java教案

 
public class PersonalInfoTest {
    public static void main(String[] args) {
        final PersonalInfo person = new PersonalInfo(); 

        // 假设会有两个线程可能更新person对象
        Thread thread1 = new Thread(new Runnable() { 
           public void run() { 
              while(true) 
                  person.setNameAndID("Justin Lin", "J.L"); 
           } 
        }); 
         
        Thread thread2 = new Thread(new Runnable() { 
            public void run() { 
               while(true) 
                   person.setNameAndID("Shang Hwang", "S.H");    
            } 
        }); 
         
        System.out.println("开始测试....."); 
        
        thread1.start(); 
        thread2.start();
    }
}

 class PersonalInfo {
    private String name; 
    private String id; 
    private int count; 
     
     //要求Name和ID的第一个字必须一样
    public PersonalInfo() { 
       name = "nobody"; 
       id = "N/A"; 
    } 
     
   synchronized 
   public void setNameAndID(String name, String id) { 
       this.name = name; 
       this.id = id; 
       if(!checkNameAndIDEqual()) 
           System.out.println("("+count + ") illegal name or ID.....");
       else;
            // System.out.println("("+count + ")太平无事.....");
                  
        
       count++; 
    } 
     
    private boolean checkNameAndIDEqual() { 
       return (name.charAt(0) == id.charAt(0)) ? 
                             true : false; 
    } 
}