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Java 多线程与锁

2024-08-15 11:23:51   224人阅读

多线程

线程和进程的区别

技术分享

 

创建线程

  • 通过实现Runnable 接口
 1 class RunnableDemo implements Runnable{ 2     private Thread t;   // create a thread  3     private String threadName; 4  5     RunnableDemo(String name){ 6         threadName = name; 7         System.out.println("Creating " + threadName); 8         try{ 9             for(int i = 3; i > 0; i--){10                 System.out.println("Thread: " + threadName + ", " + i);11                 // wait for a while.12                 Thread.sleep(50);13             }14         }catch (InterruptedException e){15             System.out.println("Thread " + threadName +" interrupted");16         }17         System.out.println("Thread “ + threadName + " exiting.");18     }  19 2021     public void start(){22         System.out.println("Starting ” + threadName);23         if( t == null){24             t = new Thread(this, threadName);25             t.start();26         }27     }28 29 public class TestThread{30     public static void main(String[] args){31         RunnableDemo R1 = new RunnableDemo("Thread-1");32         R1.start();33 34         RunnableDemo R2 = new RunnableDemo("Thread-2");35         R2.start();36      }37 }

 　　When an object implementing interface Runnable is used to create a thread, starting the thread causes the object‘s run method to be called in that separately executing thread.

 

  • 通过继承Thread类
class ThreadDemo extends Thread {   private Thread t;   private String threadName;      ThreadDemo( String name) {      threadName = name;      System.out.println("Creating " +  threadName );   }      public void run() {      System.out.println("Running " +  threadName );      try {         for(int i = 4; i > 0; i--) {            System.out.println("Thread: " + threadName + ", " + i);            // Let the thread sleep for a while.            Thread.sleep(50);         }      }catch (InterruptedException e) {         System.out.println("Thread " +  threadName + " interrupted.");      }      System.out.println("Thread " +  threadName + " exiting.");   }      public void start () {      System.out.println("Starting " +  threadName );      if (t == null) {         t = new Thread (this, threadName);         t.start ();      }   }}public class TestThread {   public static void main(String args[]) {      ThreadDemo T1 = new ThreadDemo( "Thread-1");      T1.start();            ThreadDemo T2 = new ThreadDemo( "Thread-2");      T2.start();   }   }

 

 java.lang.Thread

public class Threadextends Objectimplements Runnable
　　


锁
同步
 
 
参考：
http://www.tutorialspoint.com/java/java_multithreading.htm
http://docs.oracle.com/javase/7/docs/api/java/lang/Runnable.html
https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html
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