Solved: lowercase in a scanner

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Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. One of the numerous functions that Java carries out is to convert a string to lowercase using a scanner. Recognizing and understanding the correct usage of this function is a crucial step in mastering Java programming. In this article, we will dive into solving the common problem of converting an entry into a Java scanner to lowercase.

Scanner scanner = new Scanner(;
System.out.println("Enter a string: ");
String str = scanner.nextLine();
String lower_str = str.toLowerCase();
System.out.println("Lowercase string: " + lower_str);

Converting string inputs to lowercase can help standardize entries, especially when comparing or checking entries against a set requirement or value.

Understanding the Code: The Step-by-Step Explanation


  • Scanner scanner = new Scanner(;: This line of code sets up a scanner to read the input from the user. Here, is an input stream.
  • System.out.println(“Enter a string: “);: This prints out the prompt for the user to enter a string.
  • String str = scanner.nextLine();: This reads in the string line inputted by the user into the variable str.
  • String lower_str = str.toLowerCase();: Here, the toLowerCase() method is called on the string str. This converts all the characters in the string to lowercase, and the result is stored in the lower_str variable.
  • System.out.println(“Lowercase string: ” + lower_str);: Finally, this prints out the string after it has been converted to lowercase.

Delving Deeper: Understanding Scanner and toLowerCase()

The aforementioned code includes two key components of Java programming: the Scanner class and the toLowerCase() function. The Scanner class is a simple text scanner which can parse primitive types and strings using regular expressions. It provides a way to read user input in Java and is found in the java.util package.

toLowerCase(), on the other hand, is a function that belongs to the Java String Class. It converts all the characters in a given string to lowercase and returns the string. This function does not take any parameters and does not alter the original string.

Expanding the Scope: Similar Functions and Libraries

Aside from toLowerCase(), there are other functions under the Java String Class that deal with letter casing, among these are the toUpperCase() function, which converts all the characters in a given string to uppercase. The equalsIgnoreCase() function, which compares two strings, ignoring the considerations of case, is also worth mentioning.

Java programming language provides a rich and wide variety of libraries and functions that allow developers to accomplish tasks in a more simplified and standard way. Understanding how to use these efficiently is essential to becoming proficient at Java.

By understanding the process and significance of converting string inputs to lowercase in Java using scanner, you are one step ahead towards a deep understanding of Java programming. Happy coding!

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