调用方法后，Java切换大小写不会中断

Question

在测试用例的以下代码中，当我从case内调用scrollDown（）方法时，还将执行默认case。当我不调用scrollDown方法时，一切运行正常。你能帮忙吗？

导入java.util。*;

public class Front
{
    public static void main(String[] args)
    {
    Scanner kb = new Scanner(System.in);
    String command;
    boolean run = true;
    System.out.println("\n\n\n\n\n\n\n\n\n\n\n\nWelcome. Type help for a list of commands.");

    while(run == true)
    {
        System.out.print("Enter a command: ");
        command = kb.nextLine();
        command = command.toLowerCase();

            switch(command)
            {
                case "help":
                    System.out.println("\n\n\n\n\n\n\n\n\n\n\n\nThis is the help menu.");
                    System.out.println("Commands are \n help \n exit \n test \n");
                    break;

                case "exit":
                    System.out.println("\n\n\n\n\n\n\n\n\n\n\n\nThank you. Goodbye.");
                    run = false;
                    break;

                case "test":
                    System.out.print("Enter an interger for the test: ");
                    scrollDown(kb.nextInt());/* when I call this method the default gets executed also. When I don't call this method it works fine*/
                    System.out.println("Why?????");
                    break;

                default:
                    System.out.println("\n\n\n\n\n\n\n\n\n\n\n\nNot a recognized command. Type help for list of commands or exit to quit.");
                    break;
                }
    }




    }

    public static void scrollDown(int num)
    {
        for (int count = 1; count <= num; count++) /* counts to the number you enter on the test case option */
        System.out.println(count);
    }

}