Convert String into Title Case

Question

I am a beginner in Java trying to write a program to convert strings into title case. For example, if String s = \"my name is milind\", then the output should b

Answer 1

import java.util.Scanner;

public class TitleCase {
    public static void main(String[] args) {
        System.out.println("please enter the string");
        Scanner sc1 = new Scanner(System.in);
        String str = sc1.nextLine();
        //whatever the format entered by user, converting it into lowercase
        str = str.toLowerCase();
        // converting string to char array for 
        //performing operation on individual elements
        char ch[] = str.toCharArray();
        System.out.println("===============");
        System.out.println(str);
        System.out.println("===============");
        //First letter of senetence must be uppercase
        System.out.print((char) (ch[0] - 32));
        for (int i = 1; i < ch.length; i++) {
            if (ch[i] == ' ') {
                System.out.print(" " + (char) (ch[i + 1] - 32));
                //considering next variable after space
                i++;
                continue;
            }
            System.out.print(ch[i]);
        }
    }
}

Answer 2

You can use lamda instead-

String titalName = Arrays.stream(names.split(" "))
                                       .map(E -> String.valueOf(E.charAt(0))+E.substring(1))
                                       .reduce(" ", String::concat);

Answer 3

Using Java 8 streams:

String titleCase = (new ArrayList<>(Arrays.asList(inputString.toLowerCase().split(" "))))
                   .stream()
                   .map(word -> Character.toTitleCase(word.charAt(0)) + word.substring(1))
                   .collect(Collectors.joining(" "));

Answer 4

By the way: Unicode distinguishes between three cases: lower case, upper case and title case. Although it does not matter for English, there are other languages where the title case of a character does not match the upper case version. So you should use

Character.toTitleCase(ch)

instead of Character.toUpperCase(ch) for the first letter.

There are three character cases in Unicode: upper, lower, and title. Uppercase and lowercase are familiar to most people. Titlecase distinguishes characters that are made up of multiple components and are written differently when used in titles, where the first letter in a word is traditionally capitalized. For example, in the string "ljepotica",[2] the first letter is the lowercase letter lj(\u01C9 , a letter in the Extended Latin character set that is used in writing Croatian digraphs). If the word appeared in a book title, and you wanted the first letter of each word to be in uppercase, the correct process would be to use toTitleCase on the first letter of each word, giving you "Ljepotica" (using Lj, which is \u01C8). If you incorrectly used toUpperCase, you would get the erroneous string "LJepotica" (using LJ, which is \u01C7).

[The Java™ Programming Language, Fourth Edition, by James Gosling, Ken Arnold, David Holmes (Prentice Hall). Copyright 2006 Sun Microsystems, Inc., 9780321349804]

Answer 5

You are trying to capitalize every word of the input. So you have to do following steps:

1. get the words separated
2. capitalize each word
3. put it all together
4. print it out

Example Code:

  public static void main(String args[]){
     Scanner in = new Scanner(System.in);
     System.out.println("ent");

     String s=in.nextLine();

     //now your input string is storred inside s.
     //next we have to separate the words.
     //here i am using the split method (split on each space);
     String[] words = s.split(" ");

     //next step is to do the capitalizing for each word
     //so use a loop to itarate through the array
     for(int i = 0; i< words.length; i++){
        //we will save the capitalized word in the same place again
        //first, geht the character on first position 
        //(words[i].charAt(0))
        //next, convert it to upercase (Character.toUppercase())
        //then add the rest of the word (words[i].substring(1))
        //and store the output back in the array (words[i] = ...)
        words[i] = Character.toUpperCase(words[i].charAt(0)) + 
                  [i].substring(1);
     }

    //now we have to make a string out of the array, for that we have to 
    // seprate the words with a space again
    //you can do this in the same loop, when you are capitalizing the 
    // words!
    String out = "";
    for(int i = 0; i<words.length; i++){
       //append each word to out 
       //and append a space after each word
       out += words[i] + " ";
    }

    //print the result
    System.out.println(out);
 }

Answer 6

Code Golf variation... I challenge anyone to make it any simpler than this:

public String titleCase(String str) {
    return Arrays
            .stream(str.split(" "))
            .map(String::toLowerCase)
            .map(StringUtils::capitalize)
            .collect(Collectors.joining(" "));
}