【Map】MapTest

package cn.itcast.p1.map.test;

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

public class MapTest2 {

    public static void main(String[] args) {
        /*
         * Map在有映射关系时，可以优先考虑。
         * 
         * 在查表法中的应用较为多见。
         */
        String week = getWeek(1);
        
        System.out.println(week);
        
        System.out.println(getWeekByMap(week));

    }

    public static String getWeekByMap(String week) {
        Map<String,String> map = new HashMap<String,String>();
        
        map.put("星期一", "Mon");
        map.put("星期二", "Tus");
        map.put("星期三", "Wes");
        map.put("星期日", "Sun");
        
        
        return map.get(week);
    }

    public static String getWeek(int i) {
        if (i<1 || i>7)
            throw new RuntimeException("没有对应的星期");
        
        String[] weeks = {"","星期一","星期二","星期三","星期四"};
        
        return weeks[i];
    }

}