Chapter 18, Problem 13RE

Explanation of Solution

Explanation:

• The raw ArrayList parameter is known as legacy method.
• One can pass a parameterized type like “ArrayList<DataType>” to the legacy method.
• The legacy method is not completely safe, it might add an object of the wrong type. But the program will compile without a warning.
• A warning is thrown for a legacy method when a wrong element is added, no error happens at this time.
• The error is thrown when the element with wrong type is retrieved after adding an element, in this scenario a “ClassCastException” occurs.
• Consider the following example:

Program:

//Header file

import java.util.ArrayList;

//Defining the class

public class Main

{

  //Defining the main()

  public static void main(String args[])

  {

    //Creating ArrayList

    ArrayList<String> strList = new ArrayList<String>();

    //Adding elements to the list

    strList...