Creating multiple scanners on System.in upsets the predictability of program behavior, especially when System.in has been re-directed.
Noncompliant Code Example
import java.util.Scanner;
public class InputLibrary{
public static int getInt(){
     System.out.println("Please enter an int:");
     Scanner in = new Scanner(System.in);
     return in.nextInt();
  }
public static int getDouble(){
\{ Â Â Â Â Â System.out.println("Please enter a double:");
     Scanner in = new Scanner(System.in);
     return in.nextDouble();
  \}
}
Compliant Code Example
import java.util.Scanner;
public class InputLibrary{
private static Scanner in = new Scanner(System.in);
public static int getInt(){
     System.out.println("Please enter an int:");
     return in.nextInt();
  }
public static int getDouble(){
     System.out.println("Please enter a double:");
     return in.nextDouble();
  }
} | 