Must type multiple times, before scanner reads input

Question

If I run this code

Scanner sc = new Scanner();
while (true) {
        if (sc.next().equals(\"1\"))
            System.out.println(\"--1--\");

        else i         


        

Answer 1

You are calling sc.next() multiple times

Solution code :

        Scanner scanner = new Scanner(System.in);
        while(true){
            switch (scanner.next()) {
                case "1":
                    System.out.println("--1--");
                    break;
                case "2":
                    System.out.println("--2--");
                    break;
                case "3":
                    System.out.println("--3--");
                    break;
                case "4":
                    System.out.println("--4--");
                    break;
                case "help":
                    System.out.println("--help--");
                    break;
                default:
                    break;
            }
        }