Java April 2023 Solution 2nd semester

Q11: Find the Second Largest Integer in an Array

public class SecondLargest {
    public static void main(String[] args) {
        int[] arr = {12, 35, 1, 10, 34, 1};
        int first = Integer.MIN_VALUE, second = Integer.MIN_VALUE;

        for (int num : arr) {
            if (num > first) {
                second = first;
                first = num;
            } else if (num > second && num != first) {
                second = num;
            }
        }

        if (second == Integer.MIN_VALUE) {
            System.out.println("No second largest element.");
        } else {
            System.out.println("The second largest element is: " + second);
        }
    }
}

public class SecondLargest {

public static void main(String[] args) {

int[] arr = {12, 35, 1, 10, 34, 1};

int first = Integer.MIN_VALUE, second = Integer.MIN_VALUE;

for (int num : arr) {

if (num > first) {

second = first;

first = num;

} else if (num > second && num != first) {

second = num;

}

if (second == Integer.MIN_VALUE) {

System.out.println("No second largest element.");

} else {

System.out.println("The second largest element is: " + second);

}

Q12: Use of final Data Member, Method, and Class Final Data Member: Once assigned a value, it cannot be changed. Final Method: Prevents method overriding in subclasses. Final Class: Prevents inheritance of the class.

final class FinalClass {
    final int value = 100;

    final void display() {
        System.out.println("This is a final method.");
    }
}

// This would cause an error as FinalClass cannot be extended
// class Child extends FinalClass {}

final class FinalClass {

final int value = 100;

final void display() {

System.out.println("This is a final method.");

}

// This would cause an error as FinalClass cannot be extended

// class Child extends FinalClass {}

Q13: Why Do We Need Wrapper Classes? Wrapper classes […]