Question

Write a program that creates an ArrayList and adds a Loan object, a Date object, a string, and a Circle object to the list, and use a loop to display all the elements in the list by invoking the object’s toString() method. Hint: Remember every class in Java is descended from the java.lang.Object class. Define Generic Type E appropriately for the ArrayList.

Answer 1

Answer:

//importing package java.util.ArrayList to use ArrayList in the program

import java.util.ArrayList;

import java.util.Date;

public class test_array_list {

// Main method

public static void main(String[] args) {

 // Create an array list of objects

 ArrayList<Object> s = new ArrayList<Object>();

 s.add(new Loan());  

 s.add(new Date());  

 s.add(new String("String class"));

 s.add(new Circle());

 // Display all the elements in the list by

 // invoking the object’s to String() method

 for (int element = 0; element < o.size(); element++) {

  System.out.println((s.get(element)).toString());

 }

}

}

Explanation:

The Above code has proper comments to which is self explanatory.