方法檢查第一和最後一個字符，如果等於

Question

我非常非常新的Java，和我有這樣的指令：

定義和測試一個名爲checkString方法，將採取這個詞作爲參數，並檢查是否字符串以相同的字母開頭和結尾。如果兩個字母都相同，則方法返回true，否則返回false（返回布爾值）。該程序將小寫字母和大寫字母視爲等效。

此外，我需要使用printf語句

樣本輸出將是：

類型的字符串：ABBA

ABBA開始，以相同的字母

結束這是我到目前爲止：

import java.util.Scanner; 
public class Excercise5 { 
    public static void main(String[] arg) { 
     Scanner keyboard = new Scanner(System.in); 
     System.out.print("Type a string: "); 
     String word = keyboard.nextLine(); 
     System.out.printf ("%s begins and ends with the same letter." , checkString(word)); 
    } 
    public static boolean checkString (String word) { 
     int length = word.length(); 
     word = word.toUpperCase(); //since you are testing them as upper case 
     char firstLetter = word.charAt(0); 
     char lastLetter = word.charAt(length - 1); 
     return firstLetter == lastLetter; 
    } 
} 

Answer 1

看來你基本上已經知道了，但這裏有一個稍微更新的版本。

import java.util.Scanner; 
public class Excercise5{ 
    public static void main(String[] arg) { 
     Scanner keyboard = new Scanner(System.in); 
     System.out.print("Type a string: "); 
     String word = keyboard.nextLine(); 
     if(checkString(word)) { 
      System.out.printf("%s begins and ends with the same letter.\r\n" , word); 
     } else { 
      System.out.printf("%s does not begin and end with the same letter.\r\n", word); 
     } 
    } 

    public static boolean checkString (String word) { 
     int length = word.length(); 
     word = word.toUpperCase(); //since you are testing them as upper case 
     char firstLetter = word.charAt(0); 
     char lastLetter = word.charAt(length - 1); 
     return firstLetter == lastLetter; 
    } 
}