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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.

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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.

  • When the  //importing package java. util.ArrayList to use ArrayList in the program.  
  • Then the import java. util.ArrayList;
  • Also, they import java. util.Date;

   When the public class test_array_list {

  • Which are the // Main method
  • So, the public static void main(String[] args) {
  • It // Create an array list of objects
  • Formula are: ArrayList<Object> s = new ArrayList<Object>();
  1. s.add(new Loan());  
  2. s.add(new Date());  
  3. s.add(new String("String class"));
  4. s.add(new Circle());  
  • Then next will be  // Display all the elements in the list by  
  • // invoking the object’s to String() method
  • Then, for (int element = 0; element < o.size(); element++) {
  • The System.out.println((s.get(element)).toString());

}

}

}

The code is mention

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