FirstChar.java

//Q. 91:                                                                                              
//FirstChar(GenericsandCollections)
/*
Given an array of non-empty strings, return a Map<String, String> with a key for every different first character seen, with the value of all the strings starting with that character appended together in the order they appear in the array.
Mandatory:
1. Use Scanner Class to get input from the user
2. The Instance for Scanner Class is "sc"
3. Create a Map and the instance for Map class is "map" that takes two arguments
Hint:
Map<String,String> map = new TreeMap<String,String>();
4.Create an array of String datatype and the instance of the array is "keys" and use charAt() method to find the the stings at  particular position.
5.Then use map.put() method to append the first character of the string before the string.
6.Use getKey and getValue methods of Map Class to get the keys and values of the keys to print the result using System.out.println class.
Note: If any one of the above condition is not satisfied, then it will not show 100%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
*/

import java.io.*;
import java.util.*;
public class TestClass {
	 public static void main(String[] args) { 
	   
       Map<String,String> map = new TreeMap<String,String>();
       Scanner sc = new Scanner(System.in);
       String temp = sc.nextLine();
       String keys[] = temp.split(" ");
       
       for (String s:keys) 
       {
          if (!map.containsKey(s.substring(0,1))) 
          {  
              map.put(s.substring(0,1), s);

          }
          else
          {
             String existing = map.get(s.substring(0,1));
              map.put(s.substring(0,1), existing+s);
          }

       }
       for (Map.Entry<String, String> entry : map.entrySet()) {
            String k = entry.getKey();
            String v = entry.getValue();
            System.out.println(k + " " + v);
        } 
	}
}