if/else或switch替换为Enum

if else 使用

    /**
     * 调用
     * @param args
     */
    public static void main(String[] args) {
        int type = 8;
        eatFood(type);
    }

    /**
     * 使用if判断
     * @param type
     */
    public static void eatFood(int type){
        if(1 == type){
            System.out.println("火锅");
        } else if (2 == type) {
            System.out.println("烤肉");
        } else if (3 == type) {
            System.out.println("烤鱼");
        }else{
            System.out.println("饿着");
        }
    }

switch 使用

   /**
     * 调用
     * @param args
     */
    public static void main(String[] args) {
        int type = 8;
        eatFood(type);
    }

    /**
     * 使用switch判断
     * @param type
     */
    public static void eatFood(int type){
        switch (type){
            case 1:
                System.out.println("火锅");
                break;
            case 2:
                System.out.println("烤肉");
                break;
            case 3:
                System.out.println("烤鱼");
                break;
            default:
                System.out.println("饿着");
                break;
        }
    }

================================================

Enum

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

public class TestClass {
    private final static Map<Integer, String> map;
    static {
        map = new HashMap<>();
        map.put(1, "TYPE_1");
        map.put(2, "TYPE_2");
        map.put(3, "TYPE_3");
    }
    /**
     * 调用
     * @param args
     */
    public static void main(String[] args) {
        //map种不存在的key默认为TYPE_4
        String type = map.getOrDefault(8,"TYPE_4");
        EatEnum.valueOf(type).eatFood();
    }
}

/**
 * 接口
 */
public interface EatFood {
    void eatFood();
}

/**
 * 枚举类实现EatFood接口
 */
public enum EatEnum implements EatFood{
    TYPE_1(){
        @Override
        public void eatFood() {
            System.out.println("火锅");
        }
    },
    TYPE_2(){
        @Override
        public void eatFood() {
            System.out.println("烤肉");
        }
    },
    TYPE_3(){
        @Override
        public void eatFood() {
            System.out.println("烤鱼");
        }
    },
    TYPE_4(){
        @Override
        public void eatFood() {
            System.out.println("饿着");
        }
    };

}