package demo;

import org.apache.commons.lang3.StringUtils;

public class CapitalizeDemo {

    public static void main(String[] args) {
        String str = "hello";
        System.out.println(StringUtils.capitalize(str));
        String str1 = "World";
        System.out.println(StringUtils.uncapitalize(str1));
    }
}

Hello
world