Can an ArrayList contain multiple references to the same object in Java?

Can an object have multiple references?

Yes, two or more references, say from parameters and/or local variables and/or instance variables and/or static variables can all reference the same object.

Can you add the same object twice to an ArrayList?

5 Answers. No, ArrayList doesn’t attempt to detect duplicates at all – you can have an ArrayList with the exact same reference appearing multiple times.

Can an ArrayList contain multiple 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. … The above list can hold values of any type.

Can two variables can refer to the same ArrayList?

Syntax: Two variables refer to the same ArrayList: ArrayList<Integer> secondList = list; Now when assigned the ‘list’ to the ‘secondList’ then the ‘secondList’ also starts pointing to the same ArrayList inside the memory. Notice here simply create a new instance.

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When two references point to the same object they are called?

Object reference equality: when two object references point to the same object. Object value equality: when two separate objects happen to have the same values/state.

Can an object have more than one reference point?

Objects can be located with different combinations of distances and directions from a singular point or multiple points. (one point as a reference object can be used to locate another point or object with a distance and direction.)

How do you add multiple objects to an ArrayList?

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 you add an ArrayList to an ArrayList?

Add all the Elements of an ArrayList to another ArrayList

To add all the elements of an ArrayList to this ArrayList in Java, you can use ArrayList. addAll() method. … addAll() returns a boolean value if the elements of other ArrayList are appended to this ArrayList.

How do you pass multiple values in an ArrayList in Java?

Add multiple items to ArrayList in Java

  1. Add multiple items to arraylist – ArrayList. addAll() To add all items from another collection to arraylist, use ArrayList. …
  2. Add only selected items to arraylist. This method uses Java 8 stream API.

Can ArrayList contain different object types?

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.

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What is the difference between array and ArrayList?

Array is a fixed length data structure whereas ArrayList is a variable length Collection class. We cannot change length of array once created in Java but ArrayList can be changed. We cannot store primitives in ArrayList, it can only store objects. But array can contain both primitives and objects in Java.

Can list contain different 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 [] .

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