Java: Convert all the characters in a string to lowercase

Last update on May 21 2025 12:49:21 (UTC/GMT +8 hours)

29. Convert to Lowercase

Write a Java program to convert all characters in a string to lowercase.

Visual Presentation:

Sample Solution:

Java Code:

// Define a public class named Exercise29.
public class Exercise29 {
    
    // Define the main method.
    public static void main(String[] args) {
        // Declare and initialize a string variable.
        String str = "The Quick BroWn FoX!";

        // Convert the above string to all lowercase.
        String lowerStr = str.toLowerCase();

        // Display the original and lowercase strings for comparison.
        System.out.println("Original String: " + str);
        System.out.println("String in lowercase: " + lowerStr);
    }
}

Sample Output:

Original String: The Quick BroWn FoX!                                                                         
String in lowercase: the quick brown fox!

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to convert a string to lowercase without using the built-in toLowerCase() method.
• Write a Java program to convert a mixed-case string to lowercase and then count the occurrences of each letter.
• Write a Java program to convert a string to lowercase and compare it with another string for equality.
• Write a Java program to transform a string to lowercase and then output the string in reverse.

Go to:

• Java String Exercises Home ↩
• Java Exercises Home ↩

PREV : Char Array from String.
NEXT : Convert to Uppercase.

Java Code Editor:

Improve this sample solution and post your code through Disqus