首先來一個命令的接口：

package mode.command;/*** * 定義一個命令接口，其中有一個抽象的執行方法，參數人命令接收器* * */ public interface Command {public void execute(CommandReceiver commandReceiver); }
定義一個命令接受者的接口：

package mode.command;/*** * 命令接收類，包涵要執行的各種動作* * * */ public interface CommandReceiver {public void doSometingA();public void doSomethingB(); }
兩個Command接口的實現類：

package mode.command;public class CommandA implements Command {@Overridepublic void execute(CommandReceiver commandReceiver) {commandReceiver.doSometingA();}}
package mode.command;public class CommandB implements Command {@Overridepublic void execute(CommandReceiver commandReceiver) {commandReceiver.doSomethingB();}}
定義一個命令接收者的實現類，這里使用單例模式來設計這個類

package mode.command;public class CommandReceiverImplSingliton implements CommandReceiver {private static CommandReceiverImplSingliton commandReceiverImplSingliton;public static CommandReceiverImplSingliton getCommandSingliton() {if (null == commandReceiverImplSingliton) {commandReceiverImplSingliton = new CommandReceiverImplSingliton();return commandReceiverImplSingliton;} else {return commandReceiverImplSingliton;}}@Overridepublic void doSometingA() {System.out.println("dodoododododododoodoAAAAA");}@Overridepublic void doSomethingB() {System.out.println("dododoodododoodododoBBBBB");} }

創建命令執行器：

package mode.command;public class CommandExecutor {public void execute(Command command) {command.execute(CommandReceiverImplSingliton.getCommandSingliton());} }

用client類來測試：

package mode.command;public class Client {public static void main(String[] args) {Command commandA = new CommandA();Command commandB = new CommandB();CommandExecutor executor = new CommandExecutor();executor.execute(commandA);executor.execute(commandB); } }

轉載于:https://www.cnblogs.com/qzmpc/p/6339576.html

總結

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