请输入星期几的第一个字母来判断一下是星期几

package cskaoyan;
 
public class cskaoyan26 {
    @org.junit.Test
    public void days() {
        java.util.Scanner in = new java.util.Scanner(System.in);
        System.out.print("please input:");
        char ch = in.next().charAt(0);
 
        if (ch == 'M' || ch == 'm') {
            System.out.println("Monday");
        } else if (ch == 'T' || ch == 't') {
            System.out.print("please input second letter:");
            ch = in.next().charAt(0);
            if (ch == 'U' || ch == 'u') {
                System.out.println("Tuesday");
            } else if (ch == 'H' || ch == 'h') {
                System.out.println("Thursday");
            } else {
                System.out.println("data error");
            }
        } else if (ch == 'W' || ch == 'w') {
            System.out.println("Wednesday");
        } else if (ch == 'F' || ch == 'f') {
            System.out.println("Friday");
        } else if (ch == 'S' || ch == 's') {
            System.out.print("please input second letter:");
            ch = in.next().charAt(0);
            if (ch == 'A' || ch == 'a') {
                System.out.println("Saturday");
            } else if (ch == 'U' || ch == 'u') {
                System.out.println("Sunday");
            } else {
                System.out.println("data error");
            }
        } else {
            System.out.println("data error");
        }
 
        in.close();
    }
}