Java设计模式----命令模式

解决什么样的问题

自定义按键

代码讲解

紧密耦合关系

public class NBAGameHandler {

    public void pushA(){
        System.out.println("投篮");
    }    
    public void pushB(){
        System.out.println("封盖");
    }    
    public void pushC(){
        System.out.println("抢断");
    }
    public void pushD(){
        System.out.println("挡拆");
    }
}

以物件来代表实际行动。也就是说方法的内容抽象到一个对象中。把按键和动作解耦。

public interface Command {

    public abstract void excute();
}

public class NBAGameHandler {

    private Command[] command = new Command[4];
    public void setA(Command command){
        this.command[0]=command;
    }
    public void setB(Command command){
        this.command[1]=command;
    }
    public void setC(Command command){
        this.command[2]=command;
    }
    public void setD(Command command){
        this.command[3]=command;
    }
    
    public void pushA(){
        command[0].excute();
    }    
    public void pushB(){
        command[1].excute();
    }
    
    public void pushC(){
        command[2].excute();
    }
    public void pushD(){
        command[3].excute();
    }
}

public static void main(String[] args) {
        NBAGameHandler handler = new NBAGameHandler();
        handler.setA(new ShootCommand());
        handler.setB(new BlockCommand());
        handler.setC(new PickAndRollCommand());
        handler.setD(new StealCommand());
        
        handler.pushA();
        handler.pushB();
        handler.pushC();
        handler.pushD();
    }

public class BlockCommand implements Command{
//真实项目往往在这里会封装一个对象，完成具体的业务！！！而不会简单的打印一句话哦。
    @Override
    public void excute() {
        System.out.println("封盖");
    }

}