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: Efficient use of StringBuilder for string manipulation and Streams for data processing.

import java.util.HashMap; public class TwoSum public static int[] findTwoSum(int[] list, int sum) HashMap map = new HashMap<>(); for (int i = 0; i < list.length; i++) int complement = sum - list[i]; if (map.containsKey(complement)) return new int[] map.get(complement), i ; map.put(list[i], i); return null; Use code with caution. Copied to clipboard testdome java questions and answers

// name1 and name2 could still be null if getName() returns null return (name1 != null ? name1 : "") + (name2 != null ? name2 : ""); : Efficient use of StringBuilder for string manipulation

import java.util.*;