Question

Maximum value and its index in an array

java program that:

• Receive as input in command line the size of an array (n)
• Generate an array with numbers between 1 and 100 (inclusive 1 and 100) with the given size (a)
• Print the array with the format: {a, b, c, ..., x}, for instance {1, 2}
• Compute and print in the console the following:
  • maximum value in the array
  • one index on which the maximum value appears (a number from 0 to n-1)

Answer 1

Given below is the code for the question. Please do rate the answer if it helped. Thank you.
import java.util.Random;
import java.util.Scanner;

public class FindMax {
   public static void main(String[] args) {
       int n;
       if(args.length != 1) {
           System.out.println("No. of elements not specified as command line argument");
           Scanner input = new Scanner(System.in);
           System.out.print("How many elements? ");
           n = input.nextInt();
       }
       else {
           n = Integer.parseInt(args[0]);
       }
      
       int[] arr = new int[n];
       Random rand = new Random();
       for(int i = 0; i < n; i++) {
           arr[i] = 1 + rand.nextInt(100);
       }
      
      
       //find the max and its index
       int maxIndex = 0;
       for(int i = 1; i < n; i++) {
           if(arr[i] > arr[maxIndex]){
               maxIndex = i;
           }
       }
      
       System.out.println("The array elements are ");
       System.out.print("{");
       for(int i = 0; i < n; i++) {
           if(i != 0)
               System.out.print(", ");
           System.out.print(arr[i]);
       }
       System.out.println("}");
      
       System.out.println("The max element is " + arr[maxIndex] + " at index " + maxIndex);
   }
}