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我想知道是否有任何类似 toUpperCase 的东西用于 StringBuilder？下面是我的代码，我试图接受用户输入的短语并将其转换为首字母缩写词。有人通过建议 StringBuilder 帮助了我，但我不知道是否有办法使首字母缩写词大写。任何帮助是极大的赞赏。

public class ThreeLetterAcronym {

public static void main(String[] args) {
    String threeWords;
    int count = 0;
    int MAX = 3;
    char c;
    //create stringbuilder
    StringBuilder acronym = new StringBuilder();

    Scanner scan = new Scanner(System.in);

    //get user input for phrase
    System.out.println("Enter your three words: ");
    threeWords = scan.nextLine();

    //create an array to split phrase into seperate words.
    String[] threeWordsArray = threeWords.split(" ");

    //loop through user input and grab first char of each word.
    for(String word : threeWordsArray) {
        if(count < MAX) {
            acronym.append(word.substring(0, 1));
            ++count;

        }//end if
    }//end for  

    System.out.println("The acronym of the three words you entered is: " + acronym);
    }//end main
}//end class
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2 回答 2

7

只需将大写字符串附加到它：

acronym.append(word.substring(0, 1).toUpperCase())

或从 StringBuilder 获取 String 时将 String 转换为大写：

System.out.println("The acronym of the three words you entered is: " + acronym.toString().toUpperCase());
于 2015-06-26T04:19:01.310 回答
1

只需将大写字符串附加到 StringBuilder。

//loop through user input and grab first char of each word.
for(String word : threeWordsArray) {
    if(count < MAX) {
        acronym.append(word.substring(0, 1).toUpperCase());
        ++count;
    }//end if
}//end for

或者从 StringBuilder 获取字符串时将其大写。

System.out.println("The acronym of the three words you entered is: " + acronym.toString().toUpperCase());

如果您需要一个库，请查看 Apache Common Lang WordUtils，.WordUtils.capitalize(str)

于 2015-06-26T04:24:54.570 回答