三、命令模式Commond（行为型模式）

package commond;

import java.util.ArrayList;

import java.util.List;

publicclass CommondTest {

}

class MM {

String name;

public String getName() {

returnname;

}

publicvoid setName(String name) {

this.name = name;

}

publicvoid order(Boy b){

Command c=new Shopping();

b.addCommand(c);

c=new Hug();

b.addCommand(c);

b.executeCommands();

}

}

class Boy {

String name;

List<Command> commands=new ArrayList<Command>();

public String getName() {

returnname;

}

publicvoid executeCommands() {

for(Command c:commands){

c.execute();

}

}

publicvoid addCommand(Command c) {

commands.add(c);
}

publicvoid setName(String name) {

this.name = name;
}

publicvoid doSomething() {

}
}

abstractclass Command{

publicabstractvoid execute();

publicabstractvoid unDo();

}

class Shopping extends Command{

@Override

publicvoid execute() {

System.out.println("去购物");

}

@Override

publicvoid unDo() {
System.out.println("回家");
}

}

class Hug extends Command{

@Override

publicvoid execute() {
System.out.println("抱抱");
}

@Override

publicvoid unDo() {
System.out.println("走人");
}

}