Java?? ?????? ???? ???? ? ??? ????. ??? Thread ???? ???? ???, ?? ??? Runnable ?????? ???? ????. Thread ???? java.lang ???? ???? ????. ???? Thread ???? ???? ? ???? run() ???? ????? ? ?? ??? ??? ??? ? ????. ??? ???? ??? ?? ???? ??? ? ??? ?? ? ???? ?? ?????.

?? ?? ???:

package?org.thread.demo;??class?MyThread?extends?Thread{??private?String?name;??public?MyThread(String?name)?{??super();??this.name?=?name;??}??public?void?run(){??for(int?i=0;i<10;i++){  System.out.println("線程開(kāi)始："+this.name+",i="+i);  }  }  }  package org.thread.demo;  public class ThreadDemo01 {  public static void main(String[] args) {  MyThread mt1=new MyThread("線程a");  MyThread mt2=new MyThread("線程b");  mt1.run();  mt2.run();  }  }

??? ?? ??? ?? ??????. ?? ? ?? ??? ??? ?? ? ?? ??? ???? ?? ???? ????. start() ???? ???? JVM? ?? run() ???? ????? ?? JDK ???? ?? ? ????. ???? ????? ?? start() ???? ?????.

package org.thread.demo;  public class ThreadDemo01 {  public static void main(String[] args) {  MyThread mt1=new MyThread("線程a");  MyThread mt2=new MyThread("線程b");  mt1.start();  mt2.start();  }  };

??? ???? ????? ??? ??? ????? ??? ? ????. ???? ? ?? ???? ???? ?? start() ???? ???? ????

JDK ?? ???? src.zip? ?? Java ?? ???????. ? ??? ?? Thread?? start() ???? ??? ??? ? ????? private Native void start0()? ???? ?? ??? ? ????. ???? ?? ?? ??? ?? ??? ??? ? ??, ?? ??? JNI ??(java Native Interface)? ??? ?????.

Runnable ?????

?? ???? ?? ??? ????? Thread ?????? Runnable ????? Finish? ?????.

public interface Runnable{  public void run();  }

?:

package org.runnable.demo;  class MyThread implements Runnable{  private String name;  public MyThread(String name) {  this.name = name;  }public void run(){  for(int i=0;i<100;i++){  System.out.println("線程開(kāi)始："+this.name+",i="+i);  }  }  };

??? Runnable? ???? ??? ?? ????? start() ???? ?? Thread ????? ????. ?? Thread ???? ???? public Thread(Runnable targer)?? ???? ???, ? ???? Runnable? ?? ??? ????? ??????, ?? Runnable? ???? ?????? Thread ???? ?? ??? ? ??? ???. (start()? ??? ???? ??? ? ????):

package org.runnable.demo;  import org.runnable.demo.MyThread;  public class ThreadDemo01 {  public static void main(String[] args) {  MyThread mt1=new MyThread("線程a");  MyThread mt2=new MyThread("線程b");  new Thread(mt1).start();  new Thread(mt2).start();  }  }

? ?? ?? ??? ???? ??:

???? ???? ?? ???? ? Runnable ?????? ??? ?? ?? ?????. Runnable ????? ??? ??? ? Thread ???? ???? ??? ?? ??? ?? ?????.

• ??? ??? ??? ????. ???? ?? ?????? ??? ? ????.

• ?? ??? ??

Thread ???? ?? ???? ?? ?? ????? ?? ?? ?????.

package org.demo.dff;  class MyThread extends Thread{  private int ticket=10;  public void run(){  for(int i=0;i<20;i++){  if(this.ticket>0){??System.out.println("賣票：ticket"+this.ticket--);??}??}??}??};

??? ? ?? ??? ??? ?? ??? ??? ???? ? ?????.

package?org.demo.dff;??public?class?ThreadTicket?{??public?static?void?main(String[]?args)?{??MyThread?mt1=new?MyThread();??MyThread?mt2=new?MyThread();??MyThread?mt3=new?MyThread();??mt1.start();//每個(gè)線程都各賣了10張，共賣了30張票??mt2.start();//但實(shí)際只有10張票，每個(gè)線程都賣自己的票??mt3.start();//沒(méi)有達(dá)到資源共享??}??}

Runnable? ???? ??? ??? ?????. ?? ?? ???.

package?org.demo.runnable;??class?MyThread?implements?Runnable{??private?int?ticket=10;??public?void?run(){??for(int?i=0;i<20;i++){  if(this.ticket>0){??System.out.println("賣票：ticket"+this.ticket--);??}??}??}??}??package?org.demo.runnable;??public?class?RunnableTicket?{??public?static?void?main(String[]?args)?{??MyThread?mt=new?MyThread();??new?Thread(mt).start();//同一個(gè)mt，但是在Thread中就不可以，如果用同一??new?Thread(mt).start();//個(gè)實(shí)例化對(duì)象mt，就會(huì)出現(xiàn)異常??new?Thread(mt).start();??}??};

?? ?????? 3?? ???? ??? ? 10?? ??? ???????. ?? Runnable? ???? ?????? ????? ?????. ?? ??? ??? ? ????.

Runnable ?????? Thread ?? ??:

public ??? Thread? Runnable? ???? ??? ?????.

Thread ???? Runnable ?????? ?? ???? ??? ??????.

? ??? Java?? Runnable? Thread? ???? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!