Trying to swap min and max values in an array java

Question

import java.util.Arrays;
public class Swap
{
public static void main(String args[])
     {        
     Scanner console = new Scanner(System.in);        
     
     System.out.print("What is the size of your array? ");        
     int myArray = console.nextInt();                
     int[] size = new int[myArray];         
     int sum = 0;
     int max = 0;
     int min = 100;   
     int temp = 0;
        for (int i = 0; i < size.length; i++) 
        {              
        System.out.print("Array index " + (i) + ": ");            
        size[i] = console.nextInt();            
        sum += size[i];
        
        
        if (size[i] > max) max = size [i];
        if (size[i] < min) min = size [i];  
        
        
        }

        System.out.println ("\nmaximum value is: " + max);
        System.out.println ("\nminimum value is: " + min);
        System.out.println (Arrays.toString(size));
        
        temp = size[max];
        size[max] = size[min];
        size[min] = temp;

        
        System.out.println (Arrays.toString(size));

    }

}

I am having trouble swapping the min and max value in the array, I am able to find those values fine, and I even found a way to swap in with the temp variable, but I can't translate that into the array.

Answer 1

Only the part for max and min.

 int max = Integer.MIN_VALUE;
 int min = Integer.MAX_VALUE;
 int iAtMax = -1;
 int iAtMin = -1;   
 for (int i = 0; i < size.length; i++) {              
     if (iAtMax == -1 || max < size[i]) {
         iAtMax = i;
         max = size[i];
     }
     if (min <= size[i]) {
         iAtMin = i;
         min = size[i];  
     }
 }
 if (iAtMax != -1) {
     int temp = size[iAtMax];
     size[iAtMax] = size[iAtMin];
     size[iAtMin] = temp;
 }

You could initialize max and min so that an update in the loop always updates. Then you have to use <= max resp. >= min to update the indices. (See min above) or you can check whether there already is a max and min.

If the array is empty (or size 1) you cannot (resp. need not) swap.