任何人都可以使用循环缩短这段代码吗？

Question

只是一个简短的程序，可以确定用户输入的天数。我从星期六的第6天开始。有没有一种方法可以使用循环缩短代码？

import java.util.Scanner; 

class Week{ 
    public static void main(String args[]){ 
     Scanner input = new Scanner(System.in); 

     int days[] = {1,2,3,4,5,6,7,8}; 
     String dayNames[] = {"Monday","Tuesday","Wednesday","Thursday","Friday", 
       "Saturday", "Sunday"}; 
     int numdays; 

     System.out.println("Enter how many days from now: "); 
     numdays = input.nextInt(); 

     numdays = (6 + numdays) % 7; 

     if(numdays == 0){ 
      System.out.println(dayNames[6]); 
     } 
     else if(numdays == 1){ 
      System.out.println(dayNames[0]); 
     } 
     else if(numdays == 2){ 
      System.out.println(dayNames[1]); 
     } 
     else if(numdays == 3){ 
      System.out.println(dayNames[2]); 
     } 
     else if(numdays == 4){ 
      System.out.println(dayNames[3]); 
     } 
     else if(numdays == 5){ 
      System.out.println(dayNames[4]); 
     } 
     else if(numdays == 6){ 
      System.out.println(dayNames[5]); 
     } 
    } 
} 

Answer 1

可以使用switch案件不是多个if语句

像

switch(numdays) { 
    case 1: .... break; 
    case 2: ..... break; 
..... 
} 

或

String dayNames[] = {"Sunday", "Monday","Tuesday","Wednesday","Thursday", 
    "Friday","Saturday"}; 

，那么你可以指定索引直接

System.out.println(dayNames[numdays]); 

Answer 2

for(numdays=0;numdays<=6;numdays++){ 
System.out.println(dayNames[(numdays + 6) % 7)]); 
} 

Answer 3

开始星期日：

String dayNames[] = {"Sunday", "Monday","Tuesday","Wednesday","Thursday","Friday", 
      "Saturday"}; 

更换大的if/else与：

System.out.println(dayNames[numdays]); 

Answer 4

以下部分：

if(numdays == 0){ 
    System.out.println(dayNames[6]); 
} 
else if(numdays == 1){ 
    System.out.println(dayNames[0]); 
} 
else if(numdays == 2){ 
    System.out.println(dayNames[1]); 
} 
else if(numdays == 3){ 
    System.out.println(dayNames[2]); 
} 
else if(numdays == 4){ 
    System.out.println(dayNames[3]); 
} 
else if(numdays == 5){ 
    System.out.println(dayNames[4]); 
} 
else if(numdays == 6){ 
    System.out.println(dayNames[5]); 
} 

...是平凡更换与：

System.out.println(dayNames[(numdays + 6) % 7)]); 

Answer 5

没有必要为一个循环

String dayNames[] = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", 
       "Sunday" }; 
int i = (5 + numdays) % 7; 
System.out.println(dayNames[i]);