Java Multithreading <1>

1. Java Multi-Threading concept:
Line (thread): it refers to a task from the beginning of the execution process to the end.

Threading provides the authority to perform the task. For Java terms. In a program you can start multiple concurrent threads. Waiting to be executed.

在单处理器系统中，多个线程共享CPU时间，而操作系统负责调度及分配资源给它们。当程序作为一个应用程序来执行时。JAVA解释器为main开启一个线程。
当程序为Applet执行时，Web浏览器启动一个线程来执行applet。还能够在程序中创建附加的线程以执行并发任务。
在JAVA中，每一个任务都是Runnable的实例。

2. Creating Tasks and Threads
A task is an object, in order to create a task, a class must be defined for the task, and the task class must implement the Runnable interface. The Runnable interface is simple, such as the following:

publicabstractinterface java.lang.Runnable {  // Method descriptor #1 ()V  publicabstractvoidrun();}

There is only one run method in the interface that requires this method to tell the system how the thread will execute. The following describes how to develop a task class:
1. Once a taskclass is defined, it is possible to create a task with his own method of construction. Like what:

TaskClass task = new TaskClass(參数);

2. The task must be executed in the thread.

Threadthread=newThread(task);

3. Call the Start () method to tell the Java virtual machine that the thread is ready to execute

thread.start();

Let me give you a simple example of this:

Printchar.java

 PackageCom.guigu.zhangxx.main; Public  class Printchar implements Runnable{    Private CharCPrivate intNum Public Printchar(CharCintNUM) { This. C = C; This. num = num; } Public void Run() { for(intI=0; i<num;i++) {System.out.print (c+" "); }    }}

Cmain.java

package com.guigu.zhangxx.main;publicclass CMain {    publicstaticvoidmain(String[] args) {        //创建任务        new PrintChar(‘A‘,10);        //创建线程        new Thread(print1);        //开启线程        thread1.start();    }}

The result is:
A A A A a a a a a a A

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Java Multithreading <1>