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代码清单15-16 具体的Command类
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public class ConcreteCommand1 extends Command{
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//对哪个Receiver类进行命令处理
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private Receiver receiver；
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//构造函数传递接收者
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public ConcreteCommand1（Receiver_receiver）{
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this.receiver=_receiver；
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}
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//必须实现一个命令
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public void execute（）{
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//业务处理
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this.receiver.doSomething（）；
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}
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}
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public class ConcreteCommand2 extends Command{
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//哪个Receiver类进行命令处理
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private Receiver receiver；
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//构造函数传递接收者
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public ConcreteCommand2（Receiver_receiver）{
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this.receiver=_receiver；
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}
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//必须实现一个命令
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public void execute（）{
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//业务处理
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this.receiver.doSomething（）；
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