Write a java program that asks the user to enter a sentence

Write a java program that asks the user to enter a sentence. The program should output

1. How many characters are in the sentence

2. How many letters are in the sentence

3. The letter with the most frequency in the sentence

4. How many words are in the sentence

5. How many words start with a vowel in the sentence

Solution

/**************Sentence.java****************/

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Sentence {
   /*
   * This method will check only character of English a-z or A-Z If you want
   * check for all language supported by java then use isLetter method
   */
   public static void countLetters(String sentence) {
       int countLetters = 0;
       /* ForEach loop start */
       for (int i = 0; i < sentence.length(); i++) {
           if (Character.isDigit(sentence.charAt(i)) || Character.isWhitespace(sentence.charAt(i))) {

           } else {
               countLetters++;
           }
       } /* forEach loop End */
       System.out.println(\"Total number of Letters: \" + countLetters);
   }

   public static void frequencyWord(String sentence) {
       /* Storing Character and their count */
       Map<Character, Integer> chMap = new HashMap<>();
       char[] charArray = sentence.toCharArray();
       /* ForEach loop start */
       for (char ch : charArray) {
           /*
           * If key already exist in map then we will increase value by 1 else
           * we insert count as 1
           */
           if (chMap.containsKey(ch)) {
               chMap.put(ch, chMap.get(ch) + 1);
           } else {
               chMap.put(ch, 1);
           }

       }
       /* Getting max frequency letter in sentence */
       // iterating over keys only
       Integer max = 0;
       String ch = \"\";
       for (Character key : chMap.keySet()) {
           int val = chMap.get(key);
           if (!Character.isWhitespace(key)) {
               if (max < val) {
                   max = val;
                   ch = key + \"\";
               }
           }
       }
       /* Printing max frequency letter */
       System.out.println(\"max frequency Character is: \" + ch);

   }

   public static void checkCharacter(String sentence) {

       int cntCharacters = 0;
       /*
       * for loop start to count number of letters we used isLetter function
       */
       for (int i = 0; i < sentence.length(); i++) {
           if (Character.isLetter(sentence.charAt(i))) {
               cntCharacters++;
           }
       }
       /* For loop End */

       System.out.println(\"Total number of Characters: \" + cntCharacters);

   }

   public static void countWords(String sentence) {
       /* splitting sentence based on space for words */
       String words[] = sentence.split(\" \");
       /*
       * calculating size of words array it will give total number of words in
       * an array
       */
       int count = words.length;

       System.out.println(\"Number of words in sentence: \" + count);

   }

   public static void countWordsStartWithVowles(String sentence) {

       /* splitting sentence based on space for words */
       String words[] = sentence.split(\" \");
       /*
       * calculating size of words array it will give total number of words in
       * an array
       */
       int count = words.length;
       int cntWords = 0;
       for (int i = 0; i < count; i++) {
           /* getting string from words array */
           String word = words[i];
           /* Getting first character from string */
           String character = word.charAt(0) + \"\";

           if (character.equalsIgnoreCase(\"a\") || character.equalsIgnoreCase(\"e\") || character.equalsIgnoreCase(\"i\")
                   || character.equalsIgnoreCase(\"o\") || character.equalsIgnoreCase(\"u\")) {
               cntWords++;
           }

       }
       System.out.println(\"Total number of Words that start with Vowels: \" + cntWords);

   }

   public static void main(String[] args) {

       /* Creating Scanner class object */
       Scanner input = new Scanner(System.in);
       System.out.println(\"Please Enter an sentence\");
       String sentence = input.nextLine();
       /* Methods testing */
       Sentence.checkCharacter(sentence);
       Sentence.countLetters(sentence);
       Sentence.countWords(sentence);
       Sentence.countWordsStartWithVowles(sentence);
       Sentence.frequencyWord(sentence);

       input.close();
       /* closing input */
   }

}

/****************output start****************/

Please Enter an sentence
Hello i am good. How r u?
Total number of Characters: 17
Total number of Letters: 19
Number of words in sentence: 7
Total number of Words that start with Vowels: 3
max frequency Character is: o

/*****************output End*****************/

If you have any query please feel free to ask

Thanks a lot