• Find Second largest element in an array
• Find the first repeated word in a string

Find Second largest element in an array

import java.io.*;
import java.util.*;

class JavaProgramming {
      static int print2largest(int arr[], int n) {
         int i, first, second;
      first = second = Integer.MIN_VALUE;
      for (i = 0; i < n; i++) {
         if (arr[i] > first) {
            second = first;
            first = arr[i];
         }
         else if (arr[i] > second && arr[i] != first)
            second = arr[i];
      }
      if (second == Integer.MIN_VALUE)
         return -1;
      else
         return second;
    }

   public static void main(String[] args)
   {
      int arr[] = { 12, 35, 1, 10, 34, 1 };
      int n = arr.length;
      System.out.print(print2largest(arr, n));
   }
}

Find the first repeated word in a string

import java.util.HashMap;
import java.util.Map;
public class Main {
    public static String firstRepeatedWord(String sentence)
    {
        String[] lis = sentence.split(" ");
        Map<String, Integer> frequency = new HashMap<>();
        for (int i = 0; i < lis.length; i++)
        {
            String word = lis[i];
            if (!frequency.containsKey(word))
            {
                frequency.put(word, 1);
            }
            else
            {
                return word;
            }
        }

        return "No repeated word found";
    }
    public static void main(String[] args) {
        String sentence = "hello hello word word hello";
        System.out.println(firstRepeatedWord(sentence));
    }
}