Java program: Capitalize first letter of each word in a string

A string is a class of 'java.lang' package that stores a series of characters. Those characters are actually String-type objects. We must enclose the value of string within double quotes . Generally, we can represent characters in lowercase and uppercase in Java. And, it is also possible to convert lowercase characters into uppercase. This article aims to discuss a Java program to convert the first character of each word into uppercase in a string.

Java program to Capitalize the first character of each word in a String

Before making a Java program to convert the first lowercase character of a string into uppercase, let's understand the problem statement first with the help of an example −

Example

Input String

simply easy learning tutorialspoint

Output string

Simply Easy Learning Tutorialspoint

To capitalize the first letter of each word in a string, Java provides a built-in method called 'toUpperCase()', which accepts a lowercase character and returns the corresponding uppercase character.

The Chinese translation of

Example 1

is:

Example 1

The following example demonstrates how we can capitalize the first character of each word in a string.

method

• First, declare and initialize a String. Then, convert that string into a character array using an in-built method named 'toCharArray()'.

• Next, take a for loop that will run up to the size of the character array.

• Inside this for loop, define an if block to check whether the character array contains spaces. If the compiler encounters a space, it converts the next character to uppercase and updates the array.

• Now, we need to convert the character array back to a string.

• In the end, print the result and exit.

public class Capitalize {
   public static void main(String[] args) {
      String myinput = "simply easy learning tutorialspoint";
      // store each character to a char array
      char[] charAray = myinput.toCharArray();
      System.out.println("Before capitalizing: " + myinput);
      // for loop to capitalize first letter 
      for(int i = 0; i < charAray.length; i++) {
         // capitalizing first letter of first word
         charAray[0] = Character.toUpperCase(charAray[0]);
         // loop to check if there is space between two letters
         if(charAray[i] == ' ') {
            // capitalizing first letter of rest of the word
            charAray[i+1] = Character.toUpperCase(charAray[i+1]);
         }
      }
      // converting the character array to the string
      myinput = String.valueOf(charAray);
      // to print the final result
      System.out.println("After capitalizing the first letter: " + myinput);
   }
}

Output

Before capitalizing: simply easy learning tutorialspoint
After capitalizing the first letter: Simply Easy Learning Tutorialspoint

Example 2

Translated into Chinese:

Example 2

In the following example, we will use user-defined methods to perform the same tasks and logic.

public class Capitalize {
   public static void Capital(String myinput) { // user-defined method
      // store each character to a char array
      char[] charAray = myinput.toCharArray();
      // for loop to capitalize first letter 
      for(int i = 0; i < charAray.length; i++) {
         // capitalizing first letter of first word
         charAray[0] = Character.toUpperCase(charAray[0]);
         // loop to check if there is space between two letters
         if(charAray[i] == ' ') {
            // capitalizing first letter of rest of the word
            charAray[i+1] = Character.toUpperCase(charAray[i+1]);
         }
      }
      // converting the character array to the string
      myinput = String.valueOf(charAray);
      // to print the final result
      System.out.println("After capitalizing the first letter: " + myinput); 
   }
   public static void main(String[] args) {
      String myinput = "simply easy learning tutorialspoint";
      System.out.println("Before capitalizing: " + myinput);
      Capital(myinput); // calling the method to capitalize
   }
}

Output

Before capitalizing: simply easy learning tutorialspoint
After capitalizing the first letter: Simply Easy Learning Tutorialspoint

in conclusion

In this article, we discussed two methods to capitalize the first letter of each word in a string. However, one thing both methods have in common is the built-in method 'toUpperCase()', which converts lowercase characters to uppercase characters.

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