Java:
การทำให้ตัวอักษรเป็นตัวพิมพ์ใหญ่ในสตริง

public class CapitalizeString {
    public static void main(String[] args) {
        String text = "hello, world!";
        String capitalizedText = capitalizeWords(text);
        System.out.println(capitalizedText); // แสดงผล: "Hello, World!"
    }

    public static String capitalizeWords(String str) {
        char[] chars = str.toLowerCase().toCharArray();
        boolean found = false;
        for (int i = 0; i < chars.length; i++) {
            if (!found && Character.isLetter(chars[i])) {
                chars[i] = Character.toUpperCase(chars[i]);
                found = true;
            } else if (Character.isWhitespace(chars[i]) || chars[i]=='.' || chars[i]=='\'') { 
                found = false;
            }
        }
        return String.valueOf(chars);
    }
}

// เพิ่มการอ้างอิง: org.apache.commons:commons-lang3:3.12.0

import org.apache.commons.text.WordUtils;

public class CapitalizeString {
    public static void main(String[] args) {
        String text = "hello, world!";
        String capitalizedText = WordUtils.capitalizeFully(text);
        System.out.println(capitalizedText); // แสดงผล: "Hello, World!"
    }
}