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40+ String methods of java 👇
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// 1. length()

public class StringLengthExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        int length = str.length();
        System.out.println("Length of the string: " + length);
    }
}

// 2. toUpperCase()

public class UpperCaseExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        String upperCaseString = str.toUpperCase();
        System.out.println("Uppercase string: " + upperCaseString);
    }
}

// 3. toLowerCase()

public class LowerCaseExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        String lowerCaseString = str.toLowerCase();
        System.out.println("Lowercase string: " + lowerCaseString);
    }
}

// 4. equals()

public class StringEqualityExample {
    public static void main(String[] args) {
        String str1 = "hello";
        String str2 = "HELLO";
        boolean isEqual = str1.equals(str2);
        System.out.println("Are strings equal? " + isEqual);
    }
}

// 5. substring()

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

// 6. indexOf()

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

// 7. replace()

public class ReplaceExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        String replacedString = str.replace('l', 'z');
        System.out.println("String after replacement: " + replacedString);
    }
}

// 8. contains()

public class ContainsExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        boolean contains = str.contains("World");
        System.out.println("Does the string contain 'World'? " + contains);
    }
}

// 9. trim()

public class TrimExample {
    public static void main(String[] args) {
        String spacedString = "   Some spaces   ";
        String trimmedString = spacedString.trim();
        System.out.println("Trimmed string: '" + trimmedString + "'");
    }
}

// 10. isEmpty()

public class IsEmptyExample {
    public static void main(String[] args) {
        String emptyString = "";
        boolean isEmpty = emptyString.isEmpty();
        System.out.println("Is the string empty? " + isEmpty);
    }
}

// 11. startsWith()

public class StartsWithExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        boolean startsWith = str.startsWith("Hello");
        System.out.println("Does the string start with 'Hello'? " + startsWith);
    }
}

// 12. endsWith()

public class EndsWithExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        boolean endsWith = str.endsWith("World!");
        System.out.println("Does the string end with 'World!'? " + endsWith);
    }
}

// 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);
    }
}