Question

我是java的初学者，我们被要求将这个词的第一个和最后一个字母大写。

[提示：将字母捕获为字符串（使用子字符串方法），然后使用toUpperCase（）方法。]

到目前为止我所拥有的只是这个，

import java.util.Scanner;

public class Excercise6 {
   public static void main (String [] args){

    Scanner keyboard = new Scanner (System.in);
    System.out.print("Please Type a word: ");
    String word = keyboard.nextLine();

    int stringLength = word.length();
   String letter1 = word.substring (0,1);
   String lastletter = word.substring ((stringLength-1),(stringLength));
   String newWord =letter1.toUpperCase() + lastletter.toUpperCase();


    System.out.println("The word with first letter capitalized is: " + newWord );

   }
}

如何在第一个和最后一个字母之间添加单词？

Answer 1

代码看起来很好，只需进行一些更改

String newWord = letter1.toUpperCase()
                + word.substring(1, word.length() - 1)
                + lastletter.toUpperCase();

第一封信 - letter1.toUpperCase()

中间字符串 - word.substring(1, word.length() - 1)

最后一封信 - lastletter.toUpperCase();

<强>输出

Please Type a word: ankur
The word with first letter capitalized is: AnkuR

Answer 2

尝试这样的事情：

String a = "java";
String first = a.substring(0, 1).toUpperCase();
String last = a.substring((a.length() - 1), a.length()).toUpperCase();
String middle = a.substring(1, a.length() - 1);
System.out.println(first + middle + last);

Answer 3

您可以尝试以下

String letter1 = word.substring (0,1);
String lastletter = word.substring ((stringLength-1),(stringLength));
String newWord =letter1.toUpperCase() + word.subString(1, stringLength-1) + lastletter.toUpperCase();

这应该给你这个词的“中间”，没有第一个和最后一个字母

Answer 4

String。substring()方法将为您提供子字符串。因此，将这个词分成几部分，就像你已经部分地做了一样： -

String startChar = word.substring(0, 1);
String endChar = word.substring(word.length()-1); //If you leave out the last argument, it goes all the way to the end of the String
String middle = word.substring(1, word.length()-1);

然后只需构建你的新单词（第一个字符，加上中间部分，加上最后一个字符），并使用字符串转换大写的相关部分。upperCase()方法

 String newWord = startChar.toUpperCase() + middle + endChar.toUpperCase();

Answer 5

你可以简单地做

String st="singhakash";
System.out.println(st.substring(0,1).toUpperCase()+st.substring(1,st.length()-1)+st.substring(st.length()-1).toUpperCase());

输出

SinghakasH

DEMO

Answer 6

因为每个人都提出了可行的建议;我正在调整一个更有效和更安全的建议。

String word = keyboard.nextLine();

这不保证一个字。它会返回一行，这意味着在换行符之前的任何内容＆＃39; \ n＆＃39;。

要获得这些词语，您应该使用：

String[] words = keyboard.nextLine().split(new char[] { ' ', '\t', '\r' });

这将分割字符的行：空格，制表符和回车符（注意：不是换行符）。

接下来，我们需要使用for-each循环遍历每个单词：

for(String word : words)
{
int wordLength = word.length(); // Get length, because we're gonna use       it multiple times
if(wordLength > 0) // Ignore empty words
{
    // Only get the first character and convert it to uppercase (better than using substring)
    // Also note that we don't have to check if there's a character at 0, because we already did with wordLength > 0
    char firstCharacter = Character.toUpperCase(word.charAt(0)); 

    StringBuilder builder = new StringBuilder(firstCharacter); // We use StringBuilder class because it is efficient in concatenating objects to a string

    if(wordLength == 2) // We only got 2 characters, so no inbetween
    {
        char lastCharacter = Character.toUpperCase(word.charAt(1)); // We know this character is at index 1

        builder.append(lastCharacter); // Append last character
    }
    else // More than 2
    {
        String inbetweenCharacters = word.substring(1, wordLength - 2); // Get the words in between using substring
        char lastCharacter = Character.toUpperCase(word.charAt(wordLength - 1)); // Get the last character

        builder.append(inbetweenCharacters); // Append inbetween characters
        builder.append(lastCharacter); // Append last character
    }

    System.out.println(builder.toString()); // Print complete converted word
}
}

我做到了这一点，我希望它没有任何拼写错误

Answer 7

/ **代码添加字符串句子的第1个到第1个，第2个到第2个到第3个到第3个和第3个的字作者：deependra singh patel * /

import java.util.Scanner;

public class ReverseStringWordConcate {

  public static void main(String[] args) {
    Scanner scn = new Scanner(System.in);
    System.out.println("Enter The Sentence");
    String s1 = scn.nextLine();
    String []s2 = s1.split(" ");
    int i1 = 0;
    for(int i =s2.length-1;i>=0;i--) {
        if(s2[i]==s2[i1] ){
            char [] arr = s2[i].toCharArray();
            System.out.print(arr.length+s2[i1]);
            break;
        }
        else {
        //System.out.print(s2[i]+s2[i1]+" ");
        char [] arr = s2[i].toCharArray();
        char arr1[] = s2[i1].toCharArray();
        System.out.print((arr.length+arr1.length)+s2[i]+s2[i1]+" ");

        }
        i1++;
}






}
}

/ *样本输入：deependra singh patel thegun singhraur

   expected output :18singhraurdeependra 11thegunsingh 5patel

* /

使用String方法在java中大写第一个和最后一个字母

7 个答案: