1.命令接收者
public abstract class Receiver {
public abstract void doSomething();
}
public class Receiver1 extends Receiver {
@Override
public void doSomething() {
System.out.println("hello1");
}
}
public class Receiver2 extends Receiver {
@Override
public void doSomething() {
System.out.print("hello2");
}
}
2.命令
public abstract class Command {
public abstract void execute();
}
public class Command1 extends Command {
private Receiver receiver;
public Command1(Receiver receiver) {
this.receiver = receiver;
}
@Override
public void execute() {
receiver.doSomething();
}
}
public class Command2 extends Command {
private Receiver receiver;
public Command2(Receiver receiver) {
this.receiver = receiver;
}
@Override
public void execute() {
receiver.doSomething();
}
}
3.调用者
public class Invoker {
private Command command;
public void setCommand(Command command) {
this.command = command;
}
public void action() {
command.execute();
}
}
public class Main {
public static void main(String[] args) {
Receiver receiver = new Receiver1();
Command command = new Command1(receiver);
Invoker invoker = new Invoker();
invoker.setCommand(command);
invoker.action();
}
}
设计模式之命令模式
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