Question

I am trying to call a method from another class with list but it is not letting me. Here is my call statement:

case 2:  pm.displayList(list);
        break;

case 3:  pm.searchList(scan, list);
        break;

And here are my methods:

public void displayList(List list){
    System.out.print(list);
}
//search for element
public void searchList(Scanner scan, List list){
    System.out.println("Search for element:\t");
    String p = scan.nextLine();

    if (list.contains(p))
        System.out.println(p + " is in the list");
    else
        System.out.println(p + " is not in the list.");
}

Here is my error:

MyProgram7.java:50: displayList(java.util.List) in Prog7Methods cannot be applied to (MyList<java.lang.String>)
            case 2:  pm.displayList(list);
                                   ^
MyProgram7.java:53: searchList(java.util.Scanner,java.util.List) in Prog7Methods cannot be applied to (java.util.Scanner,MyList<java.lang.String>)
            case 3:  pm.searchList(scan, list);

Answer 1

The functions expect a List, and you’re supplying a MyList<java.lang.String>. Check that MyList implements the List interface (I bet it doesn’t).

Also, you probably shouldn’t be using the raw List type; List<String> — or MyList<String>, as appropriate — would be preferable.