[JAVA]在Java中switch-case除了可以比较int外，还可以用来比较String

 

 

/*
典型的Switch-case程序题：
成绩等级划分：
>= 90 A
>= 80 B
>= 70 C
>= 60 D
< 60 E
*/
import java.util.Scanner;
public class SwitchInt
{
    public static void main(String[] args)
    {
        double score;
        Scanner scan = new Scanner(System.in);
        score = scan.nextDouble();
        switch ((int) (score / 10))
        {
            case 10: case 9: System.out.println("A"); break;
            case 8: System.out.println("B"); break;
            case 7: System.out.println("C"); break;
            case 6: System.out.println("D"); break;
            default: System.out.println("E"); //default下，就不用break了
        }
    }
}

 

 

//在Java中switch-case除了可以比较int外，还可以用来比较String:

import java.util.Scanner;
public class SwitchString
{
    public static void main(String[] args)
    {
        String month;
        Scanner scan = new Scanner(System.in);
        System.out.print("input month (january, march, etc): ");
        month = scan.next();
        switch (month)
        {
            case "december": case "january": case "february":
                System.out.println("winter"); break;
            case "march": case "april": case "may":
                System.out.println("spring"); break;
            case "june": case "july": case "august":
                System.out.println("summer"); break;
            case "september": case "october": case "november":
                System.out.println("autumn/fall"); break;
            default:
                System.out.println("invalid month, check again.");
        }
    }
}