如何使字符串的首字母大写和其他小写

Question

I am trying to convert String first letter as capital and remaining should be small. I tried below code. It's working fine with convert first letter capital but it's converting remaining letter as small.

String str = "hiGh";
// capitalize first letter
String output = str.substring(0, 1).toUpperCase() + str.substring(1)

Output should be: High

Answer 1

You could manipulate the characters of a String to make sure that only the first one is uppercase,

String capitalizeFirstOf(String s){
 char[] chars = s.toCharArray();
  for (int i=0; i<s.length(); i++){
   if (i==0){
    chars[i] = Character.toUpperCase(chars[i]);
   }else{
    chars[i] = Character.toLowerCase(chars[i]);
   }
  }

  return new String(chars);
}

Answer 2

You need to change the later substring to the lowercase. Use the following code:

String name  = "hiGH"; 
name = name.substring(0,1).toUpperCase() + name.substring(1).toLowerCase();

Answer 3

If your doing much string converting i would recomend using a libary like: apache commons 3

They have eg UpperCase/LowerCase/SwapCase/Capitalize/Uncapitalize etc.

So you don't have to put you time on simple string methods.