How to clear the Scanner buffer in Java?

How to clear the Scanner buffer in Java?

In Java, the Scanner class doesn't have a built-in method to clear its input buffer. However, you can handle this situation by consuming and discarding unwanted input in the buffer. Here are a couple of approaches you can use to clear the Scanner buffer:

  • Use Scanner.next() in a loop:
import java.util.Scanner; public class ClearScannerBuffer { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); // Consume and discard any remaining input in the buffer while (scanner.hasNext()) { scanner.next(); } // Now the buffer is clear System.out.println("Scanner buffer is clear."); // Rest of your code // ... } }

In this approach, you continuously call scanner.next() until there is no more input left in the buffer, effectively clearing it.

  • Use Scanner.nextLine() to clear the buffer:
import java.util.Scanner; public class ClearScannerBuffer { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); // Consume and discard the current line of input scanner.nextLine(); // Now the buffer is clear System.out.println("Scanner buffer is clear."); // Rest of your code // ... } }

In this approach, you call scanner.nextLine() to read and discard the current line of input. This is useful if you want to clear the buffer after a specific input, such as a line of text.

Choose the approach that best suits your needs based on when and how you want to clear the Scanner buffer in your code.

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