Find sum of squares of numbers in list using stream API.

• Use mapToInt() to convert list of integers to IntStream

• Use map() to square each element of IntStream

• Use sum() to get the sum of squares

import java.util.*;

public class Main {

public static void main(String[] args) {

List<Integer> nums = Arrays.asList(1,2,3,4);

System.out.println("original list - " + nums);

int num_square = nums.stream() //converted list into stream

.mapToInt(Integer::intValue) //converted Integer into int

.map(n -> n*n) // squaring each number using lambda exp

.sum(); // doing sum of squares

System.out.println(num_square);

}

}

import java.util.*;

public class Main {

public static void main(String[] args) {

List<Integer> nums = Arrays.asList(1,2,3);

System.out.println("original list - " + nums);

int num_square = nums.stream() //converted list into stream

.mapToInt(Integer::intValue) //converted Integer into int

.map(n -> n*n) // squaring each number using lambda exp

.sum(); // doing sum of squares

System.out.println(num_square);

}

}