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The program to find the number of vowels and consonants present in a String in java is simple. It checks each of the characters in strings and compares it with vowels (i.e. a, e, i, o, u).

When the program finds the character equals to vowel then it increases the vow integer else cons integer increases. And at last, the result is displayed.

You may also take the user input instead of declaring the String in a Program. Following the below to take a user input.

• How to take user’s input as a String in Java.
• For loop in java

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Java Program to Find the Number of Vowels and Consonants in a String

 //number of vowels and consonants in a string 

 public class CountVowelConsonants
 {
   public static void main(String[] args)
   {
     String str = "Learning To Code";
     int vow = 0, cons = 0;
     str = str.toLowerCase();

     for (int i = 0; i < str.length(); ++i)
     {
       char ch = str.charAt(i);
       if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u')
       {
         ++vow;
       }
       else if ((ch >= 'a' && ch <= 'z'))
       {
         ++cons;
       }
     }

     System.out.println("Number of Vowels : " + vow);
     System.out.println("Number of Consonants: " + cons);
   }
 }

Output:

Number of Vowels : 6
Number of Consonants: 8

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In this tutorial, we will see how to Count Total Characters in a String in java.

The program below counts the number of letters present in the sentence (String) and displays the total character present in number.

The program checks for spaces present in the Strings and if gets space while checking each character then it will skip the spaces, charAt() function is used in the following java program.

Although if you want to know about the String and loop that are used in the program below. you may click the link below:

• Strings in java
• for loop in java
• data-types in java

We will see two Example:

1. Where the String is already defined in the program.
2. Where the string is taken as an input from the user.

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1. Program to Count Total Character in a String in Java

 //count total character in a string

 public class CountCharString
 {    
  public static void main(String[] args) 
  {    
    String str = "I am learning java";    
    int count = 0;  
      
    //counting String
    for(int i = 0; i < str.length(); i++) 
    {    
      if(str.charAt(i) != ' ')    
          count++;    
    }    
          
    //Displays the total character, space exclused    
    System.out.println("Total character in a given string: " + count);    
  }    
 }

Output:

Total character in a given string: 15

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2. Program to Count Total Character in a String in Java

We will see the example where we will get the String from the user inputs in the program as shown below:

//count total character in a string (user inputs)
 
 import java.util.Scanner;

 public class CountCharString
 {    
   public static void main(String[] args) 
   {    
     String str;    
     int count = 0;  
     
     Scanner in = new Scanner(System.in);
  
      //User Input
      System.out.println("Enter a string: ");
      str = in.nextLine();
             
      //Excluding Space  
      for(int i = 0; i < str.length(); i++) 
      {    
         if(str.charAt(i) != ' ')    
            count++;    
      }    
             
      //Displays the total character, space exclused    
      System.out.println("Total character in a entered string: " + count);    
     }    
 }

Output:

Enter a string:
I am learning java
Total character in a entered string: 15

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In this tutorial, we will write a program to calculate the frequency of Characters present in a String in java.

Frequency refers to the number of times that have occurred. In this program, we will count how many times each character is repeated in a String and display the result for each word’s frequency.

The program splits each word with space count present after every word, toCharArray() function is used in the following java program.

Although if you want to know about the String and loop that are used in the program below. you may click the link below:

• Strings in java
• for loop in java
• data-types in java

We will see two examples:

1. Where the String is already defined in the program.
2. Where the string is taken as an input from the user.

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1. Program to find the frequency of Words in Java

//find a frequency of a character 

public class FrequencyOfCharacter
{
  public static void main(String[] args)
  {
    int i, j;
    String str = "Beautiful Beach";
    int[] frequency = new int[str.length()];

    char string[] = str.toCharArray();

    for (i = 0; i < str.length(); i++)
    {
      frequency[i] = 1;
      for (j = i + 1; j < str.length(); j++)
      {
        if (string[i] == string[j])
        {
          frequency[i]++;

         	//Set string[j] to 0  
          string[j] = '0';
        }
      }
    }

    //Displays the characters with their frequency    
    System.out.println("Following Lists the characters and their frequency:");
    for (i = 0; i < frequency.length; i++)
    {
      if (string[i] != ' ' && string[i] != '0')
        System.out.println(string[i] + "->" + frequency[i]);
    }
  }
}

Output:

Following Lists the characters and their frequency:
B->2
e->2
a->2
u->2
t->1
i->1
f->1
l->1
c->1
h->1

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2. Program to find the frequency of Words in Java, user’s input

//find a frequency of a character 

import java.util.Scanner;

public class FrequencyOfCharacter
{
  public static void main(String[] args)
  {
    int i, j;
    String str;
    Scanner sc = new Scanner(System.in);

    //User Input
    System.out.println("Enter a string: ");
    str = sc.nextLine();

    int[] frequency = new int[str.length()];

    char string[] = str.toCharArray();

    for (i = 0; i < str.length(); i++)
    {
      frequency[i] = 1;
      for (j = i + 1; j < str.length(); j++)
      {
        if (string[i] == string[j])
        {
          frequency[i]++;

          //Set string[j] to 0  
          string[j] = '0';
        }
      }
    }

    //Displays the characters with their frequency    
    System.out.println("Following Lists the entered characters and their frequency:");
    for (i = 0; i < frequency.length; i++)
    {
      if (string[i] != ' ' && string[i] != '0')
        System.out.println(string[i] + "->" + frequency[i]);
    }
  }
}

Output:

Enter a string: 
Beautiful Beach
Following Lists the characters and their frequency:
B->2
e->2
a->2
u->2
t->1
i->1
f->1
l->1
c->1
h->1

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In this tutorial, we will see how to calculate the frequency of words present in a String in java.

Frequency refers to the number of times that have occurred. In this program, we will count how many time each word are repeated and display the result for each word’s frequency.

The program splits each word with space count present after every word, split() and equals() functions are used in the following java program.

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Java Program to Find a Frequency of Words

//find a frequency of words

 public class RepeatedWord
 {
 
  public static void main(String[] args)
  {
      String input="Welcome to java java Simle2code to java";  //String
      
      String[] words = input.split(" ");  //Split the word from String
      int wc = 1;    //word count initiated
      
      for(int i=0; i < words.length;i++)  
      {
        for(int j = i+1; j < words.length;j++) 
        {
         if(words[i].equals(words[j]))  //Checking for both strings are equal
         {
           wc = wc+1;    //if equal increment the count
           words[j]="0"; //Replace repeated words by zero
         }
        }
        if(words[i]!="0")
        System.out.println(words[i]+"--"+wc); //Display
        wc=1;
        
      }  
  }
}

Output:

Welcome--1
to--2
java--3
Simle2code--1

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In this tutorial, we will see the example of how to count the number of words present in a text file in java.

First, create a text file with any name you like. In this example, inputInfo.txt is the file name. Then insert some sentences in that text file. The following java code will count the number of words present in that file.

Before we start, it is important that you have an idea of the following, as this program uses them.

• String in Java
• file in Java
• while loop

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Java Program to count the number of words present in a file

//count the number of words present in a text file 

 import java.io.BufferedReader;  
 import java.io.FileReader;  
   
 public class CountNoOfWords
 {  
    public static void main(String[] args) throws Exception 
    {  
    String str;  
    int count = 0;  

    //file in read mode  
    FileReader f = new FileReader("inputInfo.txt ");  
    BufferedReader br = new BufferedReader(f);  

  
    while((str= br.readLine()) != null) 
    {  
      //Splits into words  
      String words[] = str.split(""); 

      //Counts each word  
      count = count + words.length;  

    }  

    System.out.println("Number of words present in given file: " + count);  
    br.close();  
    }  
 }

Output:

Number of words present in given file: 72

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