Java TreeMaps 1). Use a Java TreeMap 2). Count the number of times each word in

Question

Java TreeMaps
1). Use a Java TreeMap 2). Count the number of times each word in a sentence or paragraph (case-sensitive) shows up from System.in. 3). If a blank line is entered, use System.exit(0); 4). Print each word on a separate line, along with its count, in case-sensitive lexicographical order. 5). You must do this entirely in a single main method.
The output should look something like this:

art is a fancy thing that a cat likes to eat cheese thing banana art art art I LIKE LIKE: 1 a: art 4 banana: 1 cat1 cheese: 1 eat 1 fancy: 1 is 1 likes 1 that: 1 thing: 2 to: 1

Explanation / Answer

/**The java program TreeMapTester that prompts user to enter the line of text and then press ente key. Then the program finds the count of occurrences of each word.*/
//TreeMapTester.java
import java.util.Map;
import java.util.Scanner;
import java.util.TreeMap;
public class TreeMapTester {

   public static void main(String[] args) {

       //Create a Scanner class object
       Scanner scanner=new Scanner(System.in);
       //Create TreeMap object of String key and integer value
       TreeMap<String, Integer>treemap=new TreeMap<>();

       System.out.println("Enter a input of text : ");
       //read a line of text
       String text=scanner.nextLine();

       //Check if the text input is empty
       if(text.isEmpty())
       {
           System.out.println("Program closed");
           //terminate the program
           System.exit(0);
       }
       else
       {
           //Create a list of array strings from text line input
           String[] words=text.trim().split(" ");

           //Run for each loop on words array
           for (String word : words)
           {
               //Check if treemap contains word
               if (treemap.containsKey(word))
               {
                   //Increment the count of the word by one
                   //at key location word.
                   treemap.put(word, treemap.get(word) + 1);
               }
               else
               {
                   //Otherwise put the word and set value 1
                   treemap.put(word, 1);
               }
           }
       }

       //Print the key and count of each word to console
       //Create an entry set on treemap and call getKey and getValue
       for (Map.Entry<String, Integer> entry : treemap.entrySet())
       {
           System.out.println(entry.getKey() +" : "+entry.getValue());
       }
   }
}//end of the class

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Sample Output:

Enter a input of text :
art is a fancy thing that a cat likes to eat cheese thing banana art art art I LIKE
I : 1
LIKE : 1
a : 2
art : 4
banana : 1
cat : 1
cheese : 1
eat : 1
fancy : 1
is : 1
likes : 1
that : 1
thing : 2
to : 1

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