Quick Answer: Can an ArrayList have different data types in Java?

The ArrayList class implements a growable array of objects. ArrayList cannot hold primitive data types such as int, double, char, and long.

Can an ArrayList have multiple data types?

It is more common to create an ArrayList of definite type such as Integer, Double, etc. But there is also a method to create ArrayLists that are capable of holding Objects of multiple Types. We will discuss how we can use the Object class to create an ArrayList. Object class is the root of the class hierarchy.

Can ArrayList contain different types?

Yes you can. But you need a common class to your object types.

Can Java List have different data types?

You can use Object for storing any type of value for e.g. int, float, String, class objects, or any other java objects, since it is the root of all the class. For e.g. main function code, which creates the new person object, int, float, and string type, and then is added to the List, and iterated using for loop.

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Can an ArrayList store multiple object types?

Unlike simple arrays, an ArrayList can hold data of multiple data types. It permits all elements, including null . Elements in the ArrayList are accessed via an integer index.

Can we add heterogeneous data in ArrayList?

It is designed to hold heterogeneous collections of objects. The capacity of an ArrayList is the number of elements the ArrayList can hold. As elements are added to an ArrayList, the capacity is dynamically increased as required through reallocation.

Can List have different data types?

Answer. A list in Python CAN contain different types of data. Each item in the list is separated by a comma and the entire list is enclosed in square brackets [] .

How do you add multiple elements to an ArrayList in Java?

Add Multiple Items to an Java ArrayList

  1. List<Integer> anotherList = Arrays. asList(5, 12, 9, 3, 15, 88); list. …
  2. List<Integer> list = new ArrayList<>(); Collections. addAll(list, 1, 2, 3, 4, 5);
  3. List<Integer> list = new ArrayList<>(); Integer[] otherList = new Integer[] {1, 2, 3, 4, 5}; Collections.

Can ArrayList store different data types in C#?

Yes, you can store objects of different types in an ArrayList but, like pst mentioned, it’s a pain to deal with them later. If the values are related in some way you are probably better off writing a class to hold them.

Can an ArrayList contain elements that are objects?

contains(Object o) method of ArrayList class returns true if this list contains the specified element. More formally, returns true if and only if this list contains at least one element e such that Objects. equals(o, e).

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Is ArrayList a class data type?

The ArrayList class implements a growable array of objects.

ArrayLists cannot hold primitive data types such as int, double, char, and long (they can hold String since String is an object, and wrapper class objects (Double, Integer). Like an array, it contains components that can be accessed using an integer index.

What is difference between ArrayList and LinkedList?

ArrayList internally uses a dynamic array to store its elements. LinkedList uses Doubly Linked List to store its elements. ArrayList is slow as array manipulation is slower. LinkedList is faster being node based as not much bit shifting required.

Is ArrayList same as List Java?

List interface is used to create a list of elements(objects) that are associated with their index numbers. ArrayList class is used to create a dynamic array that contains objects. List interface creates a collection of elements that are stored in a sequence and they are identified and accessed using the index.

Which two Cannot be stored in an ArrayList?

ArrayLists cannot hold primitive data types such as int, double, char, and long (they can hold String since String is an object, and wrapper class objects (Double, Integer).

Can we store heterogeneous data in ArrayList in Java?

ArrayList can hold both homogeneous and heterogeneous data elements (i.e. ArrayList elements may be of different type).

Can we store different datatypes in a single array example?

Yes, We can use mixed datatypes in a single array. struct {enum { is_int, is_float, is_char } type;union {int ival;float fval;char cval;} val; } my_array[10]; 1.