Apply capitalization of one string to another

Question

I want to take the capitalization of one string and apply it to another.

For example: take Apple and orange and turn that into Orange.

This is the solution I implemented. Is there a more efficient way of doing this?

public static String applyCapitalization(String to, String from) {
 int[] capArray = toCapitalizationArray(to);
 char[] charCap = from.toCharArray();
 for (int i = 0; i < capArray.length; i++) {
 if (capArray[i] == 1) {
 charCap[i] = Character.toUpperCase(charCap[i]);
 } else {
 charCap[i] = Character.toLowerCase(charCap[i]);
 }
 }
 return new String(charCap);
}
private static int[] toCapitalizationArray(String to) {
 int[] arr = new int[to.length()];
 for (int i = 0; i < to.length(); i++) {
 char c = to.toCharArray()[i];
 if (Character.isUpperCase(c)) {
 arr[i] = 1;
 } else {
 arr[i] = 0;
 }
 }
 return arr;
}

• Ankit Soni: What if both the strings are of different length?

Answer 1

We can do this in single traversal rather then two

for (int i = 0; i < min(apple.length(),orange.length()); i++) {
 if (Character.isUpperCase(apple.toCharArray()[i]) &&
 Character.isLowercase(oranger.toCharArray()[i])){
 orange[i] = Character.toUppercase(oranger.toCharArray()[i]);
 }elseif(Character.isLowerCase(apple.toCharArray()[i]) && 
 Character.isUppercase(oranger.toCharArray()[i])){
 orange[i] = Character.toLowercase(oranger.toCharArray()[i]);
 }
}

• Teddy: And some length check for safety
• rbishnoi: Updated with min(apple.length(),orange.length())

Answer 2

For example: take Apple and orange and turn that into Orange.

I don't understand this statement

However if you want to capitalize any string, you only have to use the replace function of the String class

 public static String capitalize(String word){
 String capitalizedString = null;
 if (word != null && word.getClass() == String.class) {
 try {
 capitalizedString = word.replace(String.valueOf(word.charAt(0)), 
 String.valueOf(word.toUpperCase().charAt(0)));
 } catch (Exception exc) {
 System.out.print(exc);
 }
 }
 return capitalizedString;
 }