- How do you declare an ArrayList?
- What is namespace C#?
- Which is better linked list or ArrayList?
- What is strongly typed in C#?
- Why do we use generics in C#?
- Does C# have ArrayList?
- What is the difference between ADD and addAll in ArrayList?
- What is difference between list and ArrayList?
- Why ArrayList addAll () method is used?
- Which is faster ArrayList or list?
- Is ArrayList sorted by default?
- What is non generic collection in C#?
- Why is linked list better than ArrayList?
- What is the advantage of generic collection?
- Should I use list or ArrayList?
- Is order maintained in ArrayList?
- What is addAll in Java?
- What does .remove do in Java?
How do you declare an ArrayList?
To create an array list in Java, you declare an ArrayList variable and call the ArrayList constructor to instantiate an ArrayList object and assign it to the variable: ArrayList friends = new ArrayList(); You can optionally specific a capacity in the ArrayList constructor: ArrayList friends = new ArrayList(100);.
What is namespace C#?
Advertisements. A namespace is designed for providing a way to keep one set of names separate from another. The class names declared in one namespace does not conflict with the same class names declared in another.
Which is better linked list or ArrayList?
LinkedList is implemented as a double linked list. Its performance on add and remove is better than Arraylist, but worse on get and set methods. Vector is similar with ArrayList, but it is synchronized. ArrayList is a better choice if your program is thread-safe.
What is strongly typed in C#?
C# is a strongly-typed language. It means we must declare the type of a variable that indicates the kind of values it is going to store, such as integer, float, decimal, text, etc. The following declares and initialized variables of different data types.
Why do we use generics in C#?
Generics in C# is its most powerful feature. It allows you to define the type-safe data structures. … Generic types perform better than normal system types because they reduce the need for boxing, unboxing, and type casting the variables or objects. Parameter types are specified in generic class creation.
Does C# have ArrayList?
In C#, the ArrayList is a non-generic collection of objects whose size increases dynamically. It is the same as Array except that its size increases dynamically. An ArrayList can be used to add unknown data where you don’t know the types and the size of the data.
What is the difference between ADD and addAll in ArrayList?
The method addAll() adds all items from one ArrayList to another. add is used when you need to add single element into collection. addAll is used when you want to add all elements from source collection to your collection.
What is difference between list and ArrayList?
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. ArrayList creates an array of objects where the array can grow dynamically.
Why ArrayList addAll () method is used?
ArrayList addAll() method is used to append all of the elements of argument collection to the list at the end. The order of appended elements is that they are returned by the argument collection’s Iterator. … Use generics for compile time type safety while adding the element to arraylist.
Which is faster ArrayList or list?
Array is faster and that is because ArrayList uses a fixed amount of array. … However because ArrayList uses an Array is faster to search O(1) in it than normal lists O(n). List over arrays. If you do not exceed the capacity it is going to be as fast as an array.
Is ArrayList sorted by default?
Approach: An ArrayList can be Sorted by using the sort() method of the Collections Class in Java. This sort() method takes the collection to be sorted as the parameter and returns a Collection sorted in the Ascending Order by default.
What is non generic collection in C#?
Non-Generic collection in C# is defined in System.Collections namespace. It is a general-purpose data structure that works on object references, so it can handle any type of object, but not in a safe-type manner. Non-generic collections are defined by the set of interfaces and classes.
Why is linked list better than ArrayList?
Manipulation with LinkedList is faster than ArrayList because it uses a doubly linked list, so no bit shifting is required in memory. 3) An ArrayList class can act as a list only because it implements List only. LinkedList class can act as a list and queue both because it implements List and Deque interfaces.
What is the advantage of generic collection?
Code that uses generics has many benefits over non-generic code: Stronger type checks at compile time. A Java compiler applies strong type checking to generic code and issues errors if the code violates type safety. Fixing compile-time errors is easier than fixing runtime errors, which can be difficult to find.
Should I use list or ArrayList?
The main reason you’d do this is to decouple your code from a specific implementation of the interface. This is preferable because rest of the code only knows that data is of type List and hence you can switch between different implementations of the List interface with ease. List list = new ArrayList();
Is order maintained in ArrayList?
Both ArrayList and LinkedList are implementation of List interface. They both maintain the elements insertion order which means while displaying ArrayList and LinkedList elements the result set would be having the same order in which the elements got inserted into the List.
What is addAll in Java?
The addAll() is a method of Java Collections class which adds all of the specified elements to the specified collection. The elements to be added may be specified individually or as an array.
What does .remove do in Java?
remove(int index) method removes the element at the specified position in this list. Shifts any subsequent elements to the left (subtracts one from their indices).