IntListTest.java

// ***************************************************************
// IntListTest.java
//
// Driver to test IntList methods.
// ***************************************************************
import java.util.Scanner;
public class IntListTest {
 private static Scanner scan;
 private static IntList list = new IntList();
 //----------------------------------------------------------------
 // Creates a list, then repeatedly prints the menu and does what
 // the user asks until they quit.
 //----------------------------------------------------------------
 public static void main(String[] args) {
   scan = new Scanner(System.in);
   printMenu();
   int choice = scan.nextInt();
   while (choice != 0) {
    dispatch(choice);
    printMenu();
    choice = scan.nextInt();
   }
  }
  //----------------------------------------
  // Does what the menu item calls for.
  //----------------------------------------
 public static void dispatch(int choice) {
   int newVal;
   switch (choice) {
    case 0:
     System.out.println("Bye!");
     break;
    case 1: //add to front
     System.out.println("Enter integer to add to front");
     newVal = scan.nextInt();
     list.addToFront(newVal);
     break;
    case 2: //add to end
     System.out.println("Enter integer to add to end");
     newVal = scan.nextInt();
     list.addToEnd(newVal);
     break;
    case 3: //remove first element
     list.removeFirst();
     break;
    case 4: //print
     list.print();
     break;
    case 5:
     System.out.println("The length of the linked list is: " + list.length());
     break;
    case 6:
      list.removeLast();
      break;
    case 7:
      System.out.println("Please enter a number to replace, and the number it's replacing:");
      newVal = scan.nextInt();
      int oldVal = scan.nextInt();
        list.replace(oldVal, newVal);
      break;
    default:
     System.out.println("Sorry, invalid choice");
   }
  }
  //-----------------------------------------
  // Prints the user's choices
  //-----------------------------------------
 public static void printMenu() {
  System.out.println("\n Menu ");
  System.out.println(" ====");
  System.out.println("0: Quit");
  System.out.println("1: Add an integer to the front of the list");
  System.out.println("2: Add an integer to the end of the list");
  System.out.println("3: Remove an integer from the front of the list");
  System.out.println("4: Print the list");
  System.out.println("5: Print the length of the list");
  System.out.println("6: Remove the last integer from the list");
  System.out.println("7: Replace one integer in the list with another");
  System.out.print("\nEnter your choice: ");
 }
}