publicclassReceiver{ // 真正执行命令相应的操作 publicvoid action(){ System.out.println("执行操作"); }}public interface Command{ // 执行方法 void execute();}publicclassConcreteCommand implements Command{ //持有相应的接收者对象 privateReceiver receiver = null; publicConcreteCommand(Receiver receiver){ this.receiver = receiver; } @Override publicvoid execute(){ //通常会转调接收者对象的相应方法，让接收者来真正执行功能 receiver.action(); } }publicclassInvoker{ //持有命令对象 privateCommand command = null; publicInvoker(Command command){ this.command = command; } // 行动方法 publicvoid action(){ command.execute(); }}publicclassClient{ publicstaticvoid main(String[] args){ //创建接收者 Receiver receiver =newReceiver(); //创建命令对象，设定它的接收者 Command command =newConcreteCommand(receiver); //创建请求者，把命令对象设置进去 Invoker invoker =newInvoker(command); //执行方法 invoker.action(); } }
public interface Runnable{ public abstract void run();}
//命令模式在调用者这里不需要继承Runnable接口，但是这里考虑到实际情况，比如方便性等，继承了Runnable接口，实现了run方法，这个是Thread自身的运行run的方法classThread implements Runnable{ privateRunnable target; publicThread(Runnable target){ this.target = target; } public synchronized void start(){ if(threadStatus !=0||this!= me) thrownewIllegalThreadStateException(); group.add(this); start0();//这个是本地方法，调用run方法 if(stopBeforeStart){ stop0(throwableFromStop); } } //可选 publicvoid run(){ if(target != null){ target.run(); } }}
原文：http://www.cnblogs.com/Doing-what-I-love/p/5621165.html