Android学习笔记--设计模式--工厂

首先是简单工厂

先建立一个抽象类

package gongchang;

public abstract class Formlaf {
    
    public abstract void getColor();
}

之后建立产品1

package gongchang;

public class Cilck extends Formlaf{

    @Override
    public void getColor() {
        System.out.println("苹果是红色的");
    }
    
}

产品2

package gongchang;

public class Clicks extends Formlaf{

    @Override
    public void getColor() {
        System.out.println("橘子是橙色的");
    }
}

建立一个单例来返回实例

package gongchang;

public class Fromf  {
    private static Formlaf fromlaf;//所有文件的父类
    private Fromf(){};
    
    public static Formlaf getIntss(int a){
        if(fromlaf == null){
            synchronized (Fromf.class) {
                if(fromlaf == null){
                    switch (a) {
                    case 1:
                        //等于1的时候new苹果，
                        return fromlaf = new Cilck();
                    case 2:
                        //等于2的时候new橘子，
                        return fromlaf = new Clicks();
                    default:
                        break;
                    }
                }
            }
        }
        return null;
    }
    
}

建立客户端

package gongchang;

public class kaigong {
    private static int PING = 1;
    private static int JU = 2;
    public static void main(String[] args) {
        //根据传入的值来判断new什么文件
        Formlaf formlams = Fromf.getIntss(1);
        formlams.getColor();
        
    }
}