【Map】MapTest，mapmaptest

【Map】MapTest，mapmaptest

 1 package cn.itcast.p1.map.test; 2  3 import java.util.HashMap; 4 import java.util.Map; 5  6 public class MapTest2 { 7  8     public static void main(String[] args) { 9         /*10          * Map在有映射關係時，可以優先考慮。11          * 12          * 在查表法中的應用較為多見。13          */14         String week = getWeek(1);15         16         System.out.println(week);17         18         System.out.println(getWeekByMap(week));19 20     }21 22     public static String getWeekByMap(String week) {23         Map<String,String> map = new HashMap<String,String>();24         25         map.put("星期一", "Mon");26         map.put("星期二", "Tus");27         map.put("星期三", "Wes");28         map.put("星期日", "Sun");29         30         31         return map.get(week);32     }33 34     public static String getWeek(int i) {35         if (i<1 || i>7)36             throw new RuntimeException("沒有對應的星期");37         38         String[] weeks = {"","星期一","星期二","星期三","星期四"};39         40         return weeks[i];41     }42 43 }