leetcode-algorithms/src/ToLowerCase.java at master · anishLearnsToCode/leetcode-algorithms · GitHub

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public class ToLowerCase {

public String toLowerCase(String s) {

StringBuilder result = new StringBuilder();

for (int index = 0 ; index < s.length() ; index++) {

result.append(toLowerCase(s.charAt(index)));

}

return result.toString();

}

private char toLowerCase(char character) {

return isUpperCase(character) && isAlphabet(character) ? (char) (character + 32) : character;

}

private boolean isAlphabet(char character) {

return isUpperCase(character) || isLowerCase(character);

}

private boolean isLowerCase(char character) {

return 97 <= character && character <= 122;

}

private boolean isUpperCase(char character) {

return 65 <= character && character <= 90;

}

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