Java program to Capitalize the First and Last letter of Each Word of a String

February 14, 2022

Capitalize the First and Last letter

Today we will look at java program, we’re going to capitalize all the first and last character of the words in a string.

Lets understand with the help of an example.
Input String:- prepinsta
Output String:- PrepinstA

Capitalize The First and Last Letter in java

Algorithm

  • Take a string input from the user and store it in the variable called “s”.
  • Take a “newstr” variable initialize with an empty string.
  • Split the string into words and store it in the String array using regex.
  • Take a for-each loop and store the first character by using subString() and store it in the “firstchar” and rest of the string store in “restchar” .
  • Then add the “firstchar” and “restchar” string in “newstr”.

Code in Java

import java.util.Scanner;
public class CapitalizeTheFirstAndLastLetterOfString {
   public static void main(String[] args) {
     Scanner sc =new Scanner(System.in);
     System.out.print("Enter String : "); 
     String s = sc.nextLine();
     String newstr = "";

     String[] str = s.split("\\s"); // splitting sentence into word converted to String array

    for (String string : str) {     
      int length = string.length();
      String firstchar = string.substring(0, 1);
      String restchar = string.substring(1, length - 1);
      String lastchar = Character.toString(string.charAt(length - 1));
      newstr = newstr+firstchar.toUpperCase()+restchar+" ";
    } 
    System.out.println(newstr); 
  }
}

Output

Enter String : prep inst is best
PreP InstA IS BesT

Method 2 (Capitalize the First and Last letter)

class Main {
    static String FirstAndLast(String str)
    {
        // Create an equivalent char array of given string
        char[] ch = str.toCharArray();
        for (int i = 0; i < ch.length; i++) {

            // k stores index of first character and i is going to store index of last character.
            int k = i;
            while (i < ch.length && ch[i] != ' ')
                i++;

            // Check if the character is a small letter If yes, then Capitalise
            ch[k] = (char)(ch[k] >= 'a' && ch[k] <= 'z'
                               ? ((int)ch[k] - 32)
                               : (int)ch[k]);
            ch[i - 1] = (char)(ch[i - 1] >= 'a' && ch[i - 1] <= 'z'
                                   ? ((int)ch[i - 1] - 32)
                                   : (int)ch[i - 1]);
        }
        return new String(ch);
    }

    public static void main(String args[])
    {
        String str = "Prep insta";
        System.out.println("Input String:- "+str);
        System.out.println("String after Capitalize the first and last character of each word in a string:- "+FirstAndLast(str));
    }
}

Output

Input String:- Prep insta
String after Capitalize the first and last character of each word in a string:- PreP InstA

6 comments on “Java program to Capitalize the First and Last letter of Each Word of a String”


  • Sameer

    wrong code
    Refer below
    package Strings;

    import java.util.Scanner;

    public class Capitalize_the_first_and_last_character_of_each_word_of_a_string_2 {
    public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    System.out.print(“Enter String : “);
    String s = sc.nextLine();
    String newstr = “”;

    String[] str = s.split(“\\s”);

    for (int i = 0; i 1) {
    firstchar = string.substring(0, 1);
    restchar = string.substring(1, length – 1);
    lastchar = Character.toString(string.charAt(length – 1));
    }else {
    singlechar = string.toUpperCase();
    }
    newstr = newstr + firstchar.toUpperCase() + restchar + lastchar.toUpperCase() + singlechar + ” “;
    }
    System.out.println(newstr);
    }
    }

    0

  • Souhardya

    Scanner sc=new Scanner(System.in); String str=sc.nextLine(); String [] arr = str.split(” “); String res=””;
    res+=Character.toUpperCase(str.charAt(0));
    for(int i=1;i<str.length()-1;i++){
    if(str.charAt(i+1)==' '|| str.charAt(i-1)==' ') {
    res+=Character.toUpperCase(str.charAt(i));
    }
    else
    res+=str.charAt(i);
    }
    res+=Character.toUpperCase(str.charAt(str.length()-1));
    System.out.println(res);

    0

  • SIDDHANT

    String s=”prep insta is best”;
    String temp=””;
    String str[]=s.split(” “);
    for(String s1:str)
    {
    for(int i=0;i<s1.length();i++)
    {
    if(i==0 || i==s1.length()-1)
    {
    temp+=String.valueOf(s1.charAt(i)).toUpperCase();
    }
    else
    {
    temp+=s1.charAt(i);
    }
    }
    }
    System.out.println(temp);

    0

  • Jyotiram

    public static void main(String[] args) {
    Scanner sc =new Scanner(System.in);
    System.out.print(“Enter String : “);
    String s = sc.nextLine();
    StringBuilder newString = new StringBuilder();
    String[] str = s.split(“\\s”);
    for (String string : str) {
    int len = string.length();
    String firstChar = string.substring(0,1).toUpperCase();
    String restChar = string.substring(1, len-1);
    char lastChar = Character.toUpperCase(string.charAt(len-1));
    newString.append(firstChar).append(restChar).append(lastChar).append(” “);
    }
    System.out.println(newString);
    }

    0

  • Ganesh

    public static void main(String[] args) {
    String str=”hai preinsta”;
    String[] x=str.split(” “);
    for(int i=0;i<x.length;i++)
    {
    String y=x[i];
    System.out.print(y.substring(0,1).toUpperCase()+y.substring(1,y.length()-1)+y.substring(y.length()-1,y.length()).toUpperCase());
    }
    }

    1

  • chetan

    String s = sc.nextLine();

    String newstr = “”;

    String[] str = s.split(” “); // splitting sentence into word converted to String array

    for (int i=0; i<str.length;i++) {

    newstr = newstr + Character.toUpperCase(str[i].charAt(0));

    for(int j=1; j<str[i].length()-1;j++)

    newstr = newstr + str[i].charAt(j);
    newstr = newstr + Character.toUpperCase(str[i].charAt(str[i].length()-1))+" ";

    }System.out.println(newstr);

    0