Finding the lowest and highest numbers in a 2D array?

Question:

How do you find the lowest and highest numbers in a 2D array?

Answer:

You can use a nested for loop.

Code:

import java.util.*;
 
public class LowestNumber {
   public static void main(String[] args) {
      int[][] array = new int[5][2];
 
      // populate array
      Random r = new Random();
      for(int i=0;i<array.length;i++){
         for(int j=0;j<array[i].length;j++){
            array[i][j] = r.nextInt(1000);
         }
      }
      System.out.println("Contents: " + Arrays.deepToString(array));
 
      // find smallest and largest numbers
      int small = array[0][0];
      int large = 0;
      for(int i=0;i<array.length;i++){
         for(int j=0;j<array[i].length;j++){
            if(array[i][j] <= small)
               small = array[i][j];
            if(array[i][j] >= large)
               large = array[i][j];
         }
      }
      System.out.println("Smallest number: " + small);
      System.out.println("Largest number: " + large);
 
   }
}

Output:

$ java LowestNumber
Contents: [[658, 462], [594, 729], [412, 18], [575, 66], [224, 666]]
Smallest number: 18
Largest number: 729