Java 8 Streams - Finding largest & smallest element in an Array, List & Set

Example 1: Finding the largest element in an array

import java.util.Arrays;
/*
Java Program to find the largest number from an Array.
 */
public class DriverClass {
    public static void main(String[] args) {

        int[] numbers = {2, 6, 7, 9, 5, 155, 66, 99};
        int largestNumber = Arrays.stream(numbers).
                                       max().getAsInt();
        System.out.println("Largest Number= " + largestNumber);
    }
}

Output:

Largest Number= 155

Example 2: Finding the largest element in a List

import java.util.Arrays;
import java.util.Comparator;
import java.util.List;

/*
Java Program to find the largest number from a List.
 */
public class DriverClass {
    public static void main(String[] args) {
        List<Integer> numbers = Arrays.
                         asList(2, 6, 7, 9, 5, 155, 66, 99);
        int largestNumber = numbers.stream().
                             max(Comparator.comparing
                                (Integer::valueOf)).get();
        System.out.println("Largest Number= " + largestNumber);
    }
}

Output:

Largest Number= 155

Example 3: Finding the smallest element in an Array

import java.util.Arrays;
/*
Java Program to find the smallest number from an array 
 */
public class DriverClass {
    public static void main(String[] args) {

        int[] numbers = {12, 6, 7, 9, 5, 55, 4, 99};
        int smallestNumber = Arrays.stream(numbers).
                                    min().getAsInt();
        System.out.println("Smallest Number= " + smallestNumber);
    }
}

Output:

Smallest Number= 4

Example 4: Finding the smallest element in a List

import java.util.Arrays;
import java.util.Comparator;
import java.util.List;

/*
Java Program to find the smallest number from a List 
 */
public class DriverClass {
    public static void main(String[] args) {
        List<Integer> numbers = Arrays.
                         asList(2, 6, 7, 9, 5, 55, 4, 99);
        int smallestNumber = numbers.stream().
            min(Comparator.comparing(Integer::valueOf)).get();
        System.out.println("Smallest Number= " + smallestNumber);
    }
}

Output:

Smallest Number= 2

Example 5: Finding the smallest element in a Set

import java.util.Arrays;
import java.util.Comparator;
import java.util.Set;

/*
Java Program to find the smallest number from a Set 
 */
public class DriverClass {
    public static void main(String[] args) {
        Set<Integer> numbers = Set.of(2, 6, 7, 9, 5, 55, 4, 99);
        int smallestNumber = numbers.stream().
            min(Comparator.comparing(Integer::valueOf)).get();
        System.out.println("Smallest Number= " + smallestNumber);
    }
}

Output:
Smallest Number= 2


Example 6: Finding the largest element in a Setimport java.util.Arrays;
import java.util.Comparator;
import java.util.Set;

/*
Java Program to find the largest number from a Set.
 */
public class DriverClass {
    public static void main(String[] args) {
        Set<Integer> numbers = Set.of(2, 6, 7, 9, 5, 155, 66, 99);
        int largestNumber = numbers.stream().max(Comparator.
                        comparing(Integer::valueOf)).get();
        System.out.println("Largest Number= " + largestNumber);
    }
}

Output:
Largest Number= 155