Top 5 Array Program
1.) find the second largest number in an array of integers?
import java.util.Scanner;
public class SecondLargest {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print
("Enter the size of the array: ");
int size = scanner.nextInt();
int[] arr = new int[size];
System.out.println
("Enter the elements of the array: ");
for (int i = 0; i < size; i++) {
arr[i] = scanner.nextInt();
}
int max = Integer.MIN_VALUE;
int secondMax = Integer.MIN_VALUE;
for (int i = 0; i < size; i++) {
if (arr[i] > max) {
secondMax = max;
max = arr[i];
} else if (arr[i] >
secondMax && arr[i] != max) {
secondMax = arr[i];
}
}
if (secondMax == Integer.MIN_VALUE) {
System.out.println
("There is no second largest element");
} else {
System.out.println
("The second largest element is: "
+ secondMax);
}
scanner.close();
}
}
2.) How do you reverse an array in-place?
import java.util.Arrays;
public class ReverseArray {
public static void main(String[] args) {
int[] arr = {1, 2, 3, 4, 5};
System.out.println
("Original array:"
+Arrays.toString(arr));
reverseArray(arr);
System.out.println
("Reversed array: " +
Arrays.toString(arr));
}
public static void
reverseArray(int[] arr) {
int i = 0;
int j = arr.length - 1;
while (i < j) {
int temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
i++;
j--;
}
}
}
3.) How do you remove duplicates from an array?
import java.util.Arrays;
public class RemoveDuplicates {
public static void main(String[] args) {
int[] arr = {1, 2, 2, 3, 4, 4, 4, 5};
System.out.println
("Original array: "
+ Arrays.toString(arr));
int[] uniqueArr = removeDuplicates(arr);
System.out.println
("Array with duplicates removed: "
+ Arrays.toString(uniqueArr));
}
public static int[]
removeDuplicates(int[] arr) {
int n = arr.length;
int j = 0;
for (int i = 0; i < n - 1; i++) {
if (arr[i] != arr[i+1]) {
arr[j++] = arr[i];
}
}
arr[j++] = arr[n-1];
int[] uniqueArr = new int[j];
for (int i = 0; i < j; i++) {
uniqueArr[i] = arr[i];
}
return uniqueArr;
}
}
4.) How do you find the sum of all elements in an array?
import java.util.Arrays;
public class ArraySum {
public static void main(String[] args) {
int[] arr = {1, 2, 3, 4, 5};
System.out.println("Array: " +
Arrays.toString(arr));
int sum = getArraySum(arr);
System.out.println
("Sum of all elements: " + sum);
}
public static int getArraySum(int[] arr) {
int sum = 0;
for (int i = 0; i < arr.length; i++) {
sum += arr[i];
}
return sum;
}
}
5.) How do you check if an array contains a specific element?
import java.util.Arrays;
public class ArrayContains {
public static void main(String[] args) {
int[] arr = {1, 2, 3, 4, 5};
System.out.println("Array: "
+ Arrays.toString(arr));
int x = 3;
boolean containsX =
arrayContains(arr, x);
if (containsX) {
System.out.println
("Array contains " + x);
} else {
System.out.println
("Array does not contain " + x);
}
}
public static boolean
arrayContains(int[] arr, int x) {
for (int i = 0; i < arr.length; i++) {
if (arr[i] == x) {
return true;
}
}
return false;
}
}
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