大写或小写单词“Java"中的特定字符 [英] Uppercase or Lowercase a specific character in a word "Java"

问题描述

我已经研究了大部分问题，但我找不到如何在单词中大写或小写特定字符.

I have look into most of questions but I couldn't find how to uppercase or lowercase specific character inside a word.

示例:

String name = "Robert"

如果我想让b"大写和其余小写怎么办?如何使第一个字母大写和其余小写?

What if I would like to make "b" Uppercase and rest lowercase also how to make first letter Uppercase and rest lowercase?

像约翰">>输出>>约翰"...

Like "john" >> Output >> "John"...

我有 toUppercase() 和 toLowercase().他们转换整个文本.

I have toUppercase() and toLowercase(). They convert the whole text.

我也尝试包含 charAt 但从未与我合作过.

Also I tried to include charAt but never worked with me.

推荐答案

//Try this...

String str = "Robert";

for (int i = 0; i < str.length(); i++) {
    int aChar = str.charAt(i);

    // you can directly use character instead of ascii codes
    if (aChar == 'b') {
        aChar = aChar - 32;
    } else if (aChar >= 'A' && aChar <= 'Z') {
        aChar += 32 ;
    }

    System.out.print((char) aChar);
}

/*
输出将是-roBert

/*
Output will be- roBert

*/

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