MaxMinOfArray.java

package codingProblems;
import java.util.Arrays;
/**
 * Java program to find largest and smallest number from an array in Java.
 * You cannot use any library method both from Java and third-party library.
 */
public class MaxMinOfArray{

    public static void main(String args[]) {
        largestAndSmallest(new int[]{-20, 34, 21, -87, 92,
                             Integer.MAX_VALUE});
        largestAndSmallest(new int[]{10, Integer.MIN_VALUE, -2});
        largestAndSmallest(new int[]{Integer.MAX_VALUE, 40,
                             Integer.MAX_VALUE});
        largestAndSmallest(new int[]{1, -1, 0});
    }

    public static void largestAndSmallest(int[] numbers) {
        int largest = Integer.MIN_VALUE;
        int smallest = Integer.MAX_VALUE;
        for (int number : numbers) {
            if (number > largest) {
                largest = number;
            } else if (number < smallest) {
                smallest = number;
            }
        }

        System.out.println("Given integer array : " + Arrays.toString(numbers));
        System.out.println("Largest number in array is : " + largest);
        System.out.println("Smallest number in array is : " + smallest);
    }
}