享元模式

package ink.yql.flyweight;


public interface Flyweight {

    
    String say();

}

package ink.yql.flyweight;

public class FlyweightImpl01 implements  Flyweight{

    private String name;

    @Override
    public String say() {
        return name;
    }

    public FlyweightImpl01(String name){
        this.name = name;
    }

}

package ink.yql.flyweight;

import java.util.HashMap;
import java.util.Map;

public class FlyweihtFactory {
    
  private  static  Map<String, Flyweight> map = new HashMap<>();
    
    static Flyweight  getInstance(String name){
        Flyweight flyweight = map.get(name);
        if (flyweight == null){
            FlyweightImpl01 flyweightImpl01 = new FlyweightImpl01(name);
            map.put(name,flyweightImpl01);
            return  flyweightImpl01;
        }
        return  flyweight;
    }
}

测试

package ink.yql.flyweight;

import ink.yql.factory02.FlipPhoneFactory;

public class Test01 {
    public static void main(String[] args) {
        Flyweight a1 = FlyweihtFactory.getInstance("a");
        Flyweight a2 = FlyweihtFactory.getInstance("a");
        Flyweight a3 = FlyweihtFactory.getInstance("a3");
        Flyweight b = FlyweihtFactory.getInstance("b");
        System.out.println(a1);
        System.out.println(a2);
        System.out.println(a3);
        System.out.println(b);

    }
}