use scanner class in global scope java

It is generally not recommended to use a Scanner object in the global scope in a Java application. This is because Scanner objects are not thread-safe and can cause synchronization issues if accessed concurrently from multiple threads.

Instead of using a Scanner object in the global scope, it is better to create and use a Scanner object locally, within a specific method or block of code where it is needed. This way, you can ensure that the Scanner object is only accessed by a single thread at a time, and avoid potential synchronization issues.

Here is an example of how you might use a Scanner object in a Java application:

public class MyClass {
  public void someMethod() {
    // Create a Scanner object
    Scanner scanner = new Scanner(System.in);

    // Use the Scanner object to read input from the user
    System.out.print("Enter a number: ");
    int number = scanner.nextInt();

    // Do something with the input
    System.out.println("You entered: " + number);

    // Close the Scanner object to release resources
    scanner.close();
  }
}