// 13. charAt()

public class CharAtExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        char character = str.charAt(4);
        System.out.println("Character at index 4: " + character);
    }
}

// 14. toCharArray()

public class ToCharArrayExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        char[] charArray = str.toCharArray();
        System.out.println("Character array: " + Arrays.toString(charArray));
    }
}

// 15. split()

public class SplitExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        String[] parts = str.split(", ");
        System.out.println("Split string: " + Arrays.toString(parts));
    }
}

// 16. concat()

public class ConcatExample {
    public static void main(String[] args) {
        String str1 = "Hello, ";
        String str2 = "World!";
        String concatenatedString = str1.concat(str2);
        System.out.println("Concatenated string: " + concatenatedString);
    }
}

// 17. equalsIgnoreCase()

public class EqualsIgnoreCaseExample {
    public static void main(String[] args) {
        String str1 = "hello";
        String str2 = "HELLO";
        boolean isEqualIgnoreCase = str1.equalsIgnoreCase(str2);
        System.out.println("Are strings equal ignoring case? " + isEqualIgnoreCase);
    }
}

// 18. lastIndexOf()

public class LastIndexOfExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        int lastIndex = str.lastIndexOf('o');
        System.out.println("Last index of 'o': " + lastIndex);
    }
}

// 19. substring(int beginIndex, int endIndex)

public class SubstringWithIndicesExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        String substring = str.substring(7, 12);
        System.out.println("Substring from index 7 to 12: " + substring);
    }
}

// 20. replaceAll()

public class ReplaceAllExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        String replacedString = str.replaceAll("[aeiou]", "*");
        System.out.println("String after replacement: " + replacedString);
    }
}

// 21. matches()

public class MatchesExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        boolean matches = str.matches("^[a-zA-Z0-9]*$");
        System.out.println("Matches the pattern? " + matches);
    }
}

// 22. valueOf()

public class ValueOfExample {
    public static void main(String[] args) {
        int number = 42;
        String convertedNumber = String.valueOf(number);
        System.out.println("Converted number to string: " + convertedNumber);
    }
}

// 23. codePointAt()

public class CodePointAtExample {
    public static void main(String[] args) {
        String str = "Hello";
        int codePoint = str.codePointAt(1);
        System.out.println("Code point at index 1: " + codePoint);
    }
}

// 24. codePointBefore()

public class CodePointBeforeExample {
    public static void main(String[] args) {
        String str = "Hello";
        int codePoint = str.codePointBefore(3);
        System.out.println("Code point before index 3: " + codePoint);
    }
}

// 25. codePointCount()

public class CodePointCountExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        int codePoints = str.codePointCount(0, str.length());
        System.out.println("Number of Unicode code points: " + codePoints);
    }
}

// 26. offsetByCodePoints()

public class OffsetByCodePointsExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        int index = str.offsetByCodePoints(0, 7);
        System.out.println("Index after moving 7 code points forward: " + index);
    }
}

// 27. intern()

public class InternExample {
    public static void main(String[] args) {
        String str1 = new String("Hello");
        String str2 = str1.intern();
        System.out.println("Interned string: " + str2);
    }
}

// 28. strip()

public class StripExample {
    public static void main(String[] args) {
        String str = "  Hello, World!  ";
        String strippedString = str.strip();
        System.out.println("Stripped string: '" + strippedString + "'");
    }
}

// 29. repeat()

public class RepeatExample {
    public static void main(String[] args) {
        String str = "Hello! ";
        String repeatedString = str.repeat(3);
        System.out.println("Repeated string: " + repeatedString);
    }
}

// 30. lines()

public class LinesExample {
    public static void main(String[] args) {
        String str = "Hello\nWorld\nWelcome";
        String[] lines = str.lines().toArray(String[]::new);
        System.out.println("Individual lines:");
        for (String line : lines) {
            System.out.println(line);
        }
    }
}

// 31. stripLeading()

public class StripLeadingExample {
    public static void main(String[] args) {
        String str = "  Hello, World!  ";
        String strippedString = str.stripLeading();
        System.out.println("Leading stripped string: '" + strippedString + "'");
    }
}

// 32. stripTrailing()

public class StripTrailingExample {
    public static void main(String[] args) {
        String str = "  Hello, World!  ";
        String strippedString = str.stripTrailing();
        System.out.println("Trailing stripped string: '" + strippedString + "'");
    }
}

// 33. isBlank()

public class IsBlankExample {
    public static void main(String[] args) {
        String str = "   ";
        boolean isBlank = str.isBlank();
        System.out.println("Is the string blank? " + isBlank);
    }
}