Can we add String and Integer in ArrayList in Java?

Can we add String and Integer in ArrayList in Java?

Yeah, you can create an ArrayList but having said that, my advice for you is this: don’t. Don’t create Lists with mixed types since this suggests that your program design is broken and needs to be improved so that this sort of monster isn’t needed.

How do you store a String and Integer together in an ArrayList?

For example, to add elements to the ArrayList , use the add() method:

  1. import java. util.
  2. public class Main { public static void main(String[] args) { ArrayList cars = new ArrayList(); cars. add(“Volvo”); cars.
  3. Create an ArrayList to store numbers (add elements of type Integer ): import java. util.

Can ArrayList have integers?

For int data type, the wrapper class is called Integer . So, to create an ArrayList of ints, we need to use the Integer wrapper class as its type. We can now add integers to the ArrayList by using the class’s add() method. ArrayList , just like normal arrays, follow zero-based indexing.

Can Arraylists hold numbers and strings?

First, I am not a fan of storing different types in a collection, but if you have to do it Integers and String classes have a common ancestor, so technically, you can store them in an ArrayList collection.

Can ArrayList have different 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.

How do you add two values to an ArrayList in Java?

Add Multiple Items to an Java ArrayList

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

Can we store multiple data types in ArrayList?

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. Indexes are zero-based.

Can ArrayList store different 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.

Can array lists hold different data types?

No, we cannot store multiple datatype in an Array, we can store similar datatype only in an Array.

Can you store both String and integer in the same array?

Arrays can contain any type of element value (primitive types or objects), but you can’t store different types in a single array. You can have an array of integers or an array of strings or an array of arrays, but you can’t have an array that contains, for example, both strings and integers.

How do you create an ArrayList of strings?

In Java, we can create ArrayList by creating this simple statement: ArrayList arlist = new ArrayList( ); In above syntax, list is of “String” type, so the elements are that going to be added to this list will be string type. The type decide which type of elements list will have.

How do you add multiple strings to an ArrayList?

To initialize an ArrayList with multiple items in a single line can be done by creating a List of items using Arrays. asList(), and passing the List to the ArrayList constructor. In the given example, we are adding two strings “a” and “b” to the ArrayList.

Can an ArrayList have multiple data types?

How do you add an Integer array to an ArrayList in Java?

An array can be converted to an ArrayList using the following methods: Using ArrayList. add() method to manually add the array elements in the ArrayList: This method involves creating a new ArrayList and adding all of the elements of the given array to the newly created ArrayList using add() method.

Can we use string in array?

We can have an array with strings as its elements. Thus, we can define a String Array as an array holding a fixed number of strings or string values. String array is one structure that is most commonly used in Java.

How to create ArrayList in Java?

Create one ArrayList of ArrayList myList.

  • Create two integer variables: arrayListCount to hold the total count of ArrayList and itemCount to hold the total count of strings for each ArrayList.
  • Ask the user to enter the total number of ArrayList to add.
  • Ask the user to enter the total elements for each ArrayList.
  • How do I Declare and initialize an array in Java?

    How do you declare and initialize an array? We declare an array in Java as we do other variables, by providing a type and name: int[] myArray; To initialize or instantiate an array as we declare it, meaning we assign values as when we create the array, we can use the following shorthand syntax: int[] myArray = 13, 14, 15;

    What are the different types of arrays in Java?

    – Print 2D array in Java – Program to Print 3×3 Matrix – Sum of matrix elements in Java – Sum of Diagonal Elements of Matrix – Row sum and Column sum of Matrix – Matrix Addition in Java – Subtraction of two matrices in Java – Transpose of a Matrix in Java – Matrix Multiplication in Java – Menu-driven program for Matrix operations

    How do I search an array in Java?

    JavaScript does not support associative arrays.

  • You should use objects when you want the element names to be strings (text).
  • You should use arrays when you want the element names to be numbers.