Java经典习题26

/*
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 Class26 {

public static void main(String[] args) {
System.out.println("输入第一个字母:");
Scanner sc1 = new Scanner(System.in);
String s1 = sc1.nextLine();
char ch1 = s1.charAt(0);
if(ch1 < 'A' || ch1 > 'Z' || ch1 < 'a' || ch1 > 'z'){
//System.out.println("输入有误!");
}
switch(ch1){
case 'M':
System.out.println("星期一");
break;
case 'm':
System.out.println("星期一");
break;
case 'W':
System.out.println("星期三");
break;
case 'w':
System.out.println("星期三");
break;
case 'F':
System.out.println("星期五");
break;
case 'f':
System.out.println("星期五");
break;
case 'T':
System.out.println("请输入第二个字母:");
Scanner sc2 = new Scanner(System.in);
String s2 = sc2.nextLine();
char ch2 = s2.charAt(0);
if(ch2 < 'A' || ch2 > 'Z' || ch2 < 'a' || ch2 > 'z'){
//System.out.println("输入有误!");
}else if(ch2 == 'U'){
System.out.println("星期二");
}else if(ch2 == 'H'){
System.out.println("星期四");
}else{
System.out.println("输入有误!");
}
break;
case 't':
System.out.println("请输入第二个字母:");
Scanner sc3 = new Scanner(System.in);
String s3 = sc3.nextLine();
char ch3 = s3.charAt(0);
if(ch3 < 'A' || ch3 > 'Z' || ch3 < 'a' || ch3 > 'z'){
//System.out.println("输入有误!");
}else if(ch3 == 'u'){
System.out.println("星期二");
}else if(ch3 == 'h'){
System.out.println("星期四");
}else{
System.out.println("输入有误!");
}
break;
case 'S':
System.out.println("请输入第二个字母:");
Scanner sc4 = new Scanner(System.in);
String s4 = sc4.nextLine();
char ch4 = s4.charAt(0);
if(ch4 < 'A' || ch4 > 'Z' || ch4 < 'a' || ch4 > 'z'){
//System.out.println("输入有误!");
}else if(ch4 == 'A'){
System.out.println("星期六");
}else if(ch4 == 'U'){
System.out.println("星期日");
}else{
System.out.println("输入有误!");
}
break;
case 's':
System.out.println("请输入第二个字母:");
Scanner sc5 = new Scanner(System.in);
String s5 = sc5.nextLine();
char ch5 = s5.charAt(0);
if(ch5 < 'A' || ch5 > 'Z' || ch5 < 'a' || ch5 > 'z'){
//System.out.println("输入有误!");
}else if(ch5 == 'u'){
System.out.println("星期六");
}else if(ch5 == 'h'){
System.out.println("星期日");
}else{
System.out.println("输入有误!");
}
break;
default:
System.out.println("输入有误!");

}

}

}