Single Thread Execution-优快云博客

本文介绍了一个使用Java实现的简单示例，通过synchronized关键字确保了多个线程在访问共享资源时的线程安全性。示例中定义了一个Gate类来模拟门禁系统，该系统记录通过的人名及其地址，并检查两者首字母是否一致。

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class Gate
{
   private int counter = 0;
   private String name="nobody";
   private String address = "nowhere";
   public synchronized void pass(String name,String address)
   {
       this.counter++;
       this.name = name;
       this.address = address;
       check();
   }
   public synchronized String toString()
   {
       return "No."+counter+":"+name+","+address;
   }
   private void check()
   {
       if(name.charAt(0)!=address.charAt(0))
       {
           System.out.println("BROKEN"+this.toString());
           System.out.println("name[0]"+name.charAt(0));
           System.out.println("address[0]"+address.charAt(0));
       }else
       {
           System.out.println("yes");
       }
   }
}
class UserThread extends Thread
{
   private final Gate gate;
   private final String myName;
   private final String myAddress;

   public UserThread(Gate gate,String myName,String myAddress)
   {
       this.gate = gate;
       this.myAddress = myAddress;
       this.myName = myName;
   }
   public void run()
   {
       System.out.println(myName+"BEGIN");
       while(true)
       {

           gate.pass(myName, myAddress);
       }
   }
}

public class Test {

   public synchronized static void main(String[] args) throws UnsupportedEncodingException, IOException, InterruptedException {

       Gate gate = new Gate();
       new UserThread(gate,"Alice","Alaska").start();
       new UserThread(gate,"Bobby","Brazil").start();
       new UserThread(gate,"Chris","Canda").start();
   }
}