判断一下是星期几

题目：请输入星期几的第一个字母来判断一下是星期几
如果第一个字母一样，则继续   判断第二个字母。

import java.util.*;
public class Test{
    String inpStr="";//输入的字符串
    String[] weeks = {"Monday","Tuesday","Wednesday","Thursday","Friday","Satday","Sunday"};
    //判断第一个字母存在？，不纯在则置inpStr为空
    public boolean isFirst(char c)
    {
        switch(c){
        case 'M':
        case 'T':
        case 'W':
        case 'F':
        case 'S':return true;
        }
        inpStr="";
        System.out.println("Msg: first Character is no allow!inpStr aleardy clear.....");
        return false;
    }
    //判断可否得到唯一一个单词
    public boolean canFind(String str){
        int flag=0;
        for(int i=0;i<weeks.length;i++){
            if(weeks[i].startsWith(str))
            flag++;
        }
        return flag==1;
    }
    //取出那一天
    public String getDay(String str){
        String result="";
        for(int i=0;i<weeks.length;i++){
            if(weeks[i].startsWith(str))
            result=weeks[i];
        }
        return result;
    }
    public static void main(String args[]){
        Test t = new Test();
        String c;
        Scanner scan = new Scanner(System.in);
        //输入
        do{
        System.out.println("input");
        c=scan.nextLine();
        t.inpStr+=c;
        }while(t.isFirst(t.inpStr.charAt(0))!=true||t.canFind(t.inpStr)!=true);
        System.out.println(t.getDay(t.inpStr));
    }
}
    /*-----  运行输出  ----
    C:\>java Test
    input
    y
    Msg: first Character is no allow!inpStr aleardy clear.....
    input
    M
    Monday
    
    C:\>java Test
    input
    T
    input
    u
    Tuesday
    
    C:\>java Test
    input
    S
    input
    u
    Sunday
    */