Java - 将小写转换为大写而不使用 toUppercase()

问题描述

我正在尝试创建一个简短的程序，它将所有大写字母转换为小写字母(从命令行输入).

I'm trying to create a short program that would convert all letters that are uppercase to lowercase (from the command line input).

以下编译但没有给我我期望的结果.这会是什么原因??

The following compiles but does not give me the result I am expecting. What would be the reason for this??

例如)java toLowerCase BANaNa -> 给出香蕉的输出

Eg) java toLowerCase BANaNa -> to give an output of banana

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

            toLowerCase(args[0]);
        }

        public static void toLowerCase(String a){

            for (int i = 0; i< a.length(); i++){

                char aChar = a.charAt(i);
                if (65 <= aChar && aChar<=90){
                    aChar = (char)( (aChar + 32) ); 
                }

                System.out.print(a);
            }
         }   
    }

推荐答案

对我来说看起来像是作业，只是一个提示.您正在打印字符串 a，而您正在修改 char 类型 aChar，而不是修改原始字符串 a.(记住字符串是不可变的).

Looks like homework to me, Just a hint. You are printing string a whereas you are modifying the char type aChar, its not modifying the original string a. (Remember strings are immutable).

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