在字符数组转换为小写字符为大写字符（JAVA） [英] Converting a lowercase char in a char array to an uppercase char (java)

问题描述

您好，我想写code的一个小片段来检查，如果每个字符在字符数组是小写或大写。现在它使用字符的ASCII码才能检查。它检查后应的炭转换为大写如果它已不那么

Hello I am trying to write a little segment of code that checks if each char in a char array is lower case or uppercase. Right now it uses the char's ASCII number to check. After it checks it should convert the char to upper case if it is not already so:

for (int counter = 0; counter < charmessage.length; counter++) {
    if (91 - charmessage[counter] <= 0 && 160 - charmessage[counter] != 0) {
    charmessage[counter] = charmessage[counter].toUpperCase();
    } 
}

charmessage 已经在程序初始化previously。 160部分，以确保它不会一个空间转换为大写。我如何获得 .toUpperCase 方法来工作？

charmessage is already initialized previously in the program. The 160 part is to make sure it doesn't convert a space to uppercase. How do I get the .toUpperCase method to work?

推荐答案

我会做这种方式。首先检查是否字符是字母，如果是小写。在此之后只使用Character.toUpperCase（CHAR CH）

I would do it this way. First check if the character is a letter and if it is lowercase. After this just use the Character.toUpperCase(char ch)

if(Character.isLetter(charmessage[counter]) && Character.isLowerCase(charmessage[counter])){
    charmessage[counter] = Character.toUpperCase(charmessage[counter]);
}

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