Free Java Interview Question And Answers Pdf [Quiz -6 ]

Java Interview Question And Answers Pdf ( Quiz -6 )

Find the Largest Element: Write a function that finds and returns the largest element in an array of integers.

public class FindLargestElement {
    public static int findLargestElement(int[] array) {
        if (array == null || array.length == 0) {
            throw new IllegalArgumentException("Array must not be empty or null");
        }

        int maxElement = array[0];
        for (int element : array) {
            if (element > maxElement) {
                maxElement = element;
            }
        }
        return maxElement;
    }

    public static void main(String[] args) {
        int[] array = {12, 5, 27, 8, 18};
        System.out.println("Largest Element: " + findLargestElement(array));
    }
}

Check 50+ JAVA Projects with Source Code

Check for Anagrams: Create a program or function that checks if two given strings are anagrams of each other (contain the same characters with the same frequencies).

import java.util.Arrays;

public class AnagramChecker {
    public static boolean areAnagrams(String str1, String str2) {
        char[] charArray1 = str1.replaceAll("[\\s]", "").toLowerCase().toCharArray();
        char[] charArray2 = str2.replaceAll("[\\s]", "").toLowerCase().toCharArray();
        Arrays.sort(charArray1);
        Arrays.sort(charArray2);

        return Arrays.equals(charArray1, charArray2);
    }

    public static void main(String[] args) {
        String word1 = "listen";
        String word2 = "silent";
        System.out.println("Are Anagrams: " + areAnagrams(word1, word2));
    }
}

Check 100+ JAVA Spring Boot Projects with Source Code

Calculate Fibonacci Sequence: Write a function to generate the Fibonacci sequence up to a specified limit. The Fibonacci sequence starts with 0 and 1, and each subsequent number is the sum of the two preceding ones.

public class FibonacciSequence {
    public static void generateFibonacci(int limit) {
        int a = 0, b = 1;
        System.out.print(a + " " + b + " ");

        for (int i = 2; i < limit; i++) {
            int next = a + b;
            System.out.print(next + " ");
            a = b;
            b = next;
        }
    }

    public static void main(String[] args) {
        int sequenceLimit = 10; // Example limit
        generateFibonacci(sequenceLimit);
    }
}

Binary to Decimal Converter: Implement a program or function that converts a binary number (in string or integer form) to its decimal equivalent.

public class BinaryToDecimalConverter {
    public static int binaryToDecimal(String binary) {
        return Integer.parseInt(binary, 2);
    }

    public static void main(String[] args) {
        String binaryNumber = "1101"; // Example binary number
        System.out.println("Decimal Equivalent: " + binaryToDecimal(binaryNumber));
    }
}

Find Common Elements: Write a function that takes two arrays as input and returns a new array containing the common elements present in both arrays.

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class FindCommonElements {
    public static Integer[] findCommonElements(int[] array1, int[] array2) {
        List<Integer> commonElements = new ArrayList<>();

        for (int element1 : array1) {
            for (int element2 : array2) {
                if (element1 == element2) {
                    commonElements.add(element1);
                    break;
                }
            }
        }

        return commonElements.toArray(new Integer[0]);
    }

    public static void main(String[] args) {
        int[] array1 = {1, 2, 3, 4, 5};
        int[] array2 = {3, 5, 7, 9};
        System.out.println("Common Elements: " + Arrays.toString(findCommonElements(array1, array2)));
    }
}