JAVA PROGRAMMING

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//Armstrong number import java.util.Scanner; public class ArmstrongNumbers { // Function to check if a number is Armstrong or not public static boolean isArmstrong(int num) { int originalNum = num; int numDigits = String.valueOf(num).length(); int armstrongSum = 0; while (num > 0) { int digit = num % 10; armstrongSum += Math.pow(digit, numDigits); num /= 10; } return armstrongSum == originalNum; } // Function to print Armstrong numbers within a given range public static void printArmstrongNumbers(int start, int end) { System.out.println("Armstrong numbers between " + start + " and " + end + " are:"); for (int i = start; i <= end; i++) { if (isArmstrong(i)) { System.out.println(i); } } } public static void main(String[] args) { Scanner scanner = new Scanner(System.in); // Input range from the user System.out.print("Enter the start of the range: "); int start = scanner.nextInt(); System.out.print("Enter the end of the range: "); int end = scanner.nextInt(); // Call function to print Armstrong numbers in the given range printArmstrongNumbers(start, end); scanner.close(); } }

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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);
    }
}

// 1. length() /jv 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);     } }

// 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);
    }
}

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// 44. join()

public class JoinExample {
    public static void main(String[] args) {
        String[] words = {"Hello", "World", "Java"};
        String joinedString = String.join(", ", words);
        System.out.println("Joined string: " + joinedString);
    }
}

// 43. offsetByCodePoints()

public class OffsetByCodePointsExample {
    public static void main(String[] args) {
        String str = "Hello World";
        int index = str.offsetByCodePoints(0, 6);
        System.out.println("Index after moving by code points: " + index);
    }
}

// 42. regionMatches()

public class RegionMatchesExample {
    public static void main(String[] args) {
        String str1 = "Hello World";
        String str2 = "WORLD";
        boolean matches = str1.regionMatches(true, 6, str2, 0, 5);
        System.out.println("Do regions match ignoring case? " + matches);
    }
}

// 41. replaceFirst()

public class ReplaceFirstExample {
    public static void main(String[] args) {
        String str = "apple orange apple orange";
        String replacedString = str.replaceFirst("apple", "banana");
        System.out.println("String after replacing first occurrence: " + replacedString);
    }
}

// 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);
    }
}

// 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);
    }
}

// 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);
    }
}