capitalize each word in string java

                                    String str = "java";
String cap = str.substring(0, 1).toUpperCase() + str.substring(1);

                                    import org.apache.commons.text.WordUtils;

public class WordUtilsCapitalizeFullyExample {
    public static void main(String[] args) {
        String result1 = WordUtils.capitalizeFully("how to CAPITALIZE first letter words");
        System.out.println(result1);
    }
}

                                    String str = "hello world!";

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

// print the string
System.out.println(output);
// Hello world!