How do you increase the capacity of an ArrayList object manually?

How do you increase the capacity of an ArrayList object manually?

You can increase the capacity of an ArrayList object manually by calling ensureCapacity( ). By increasing its capacity once, at the start, you can prevent several reallocations later.

Which method is used to determine the number of items stored in an ArrayList object?

The size() method of java. util. ArrayList class is used to get the number of elements in this list. Returns Value: This method returns the number of elements in this list.

Which of the following is the correct header for a method that accepts an integer array as an argument?

public static void pass My Array(int[][]) is a correct method header for receiving a two-dimensional array as an argument.

Which of the following ArrayList class methods is used to insert?

Methods in Java ArrayList

Method Description
addAll(int index, Collection C) Used to insert all of the elements starting at the specified position from a specific collection into the mentioned list.
clear() This method is used to remove all the elements from any list.

Can you change the size of an ArrayList?

ArrayList class is a resizable array, present in java. util package. The difference between an array and an ArrayList in Java, is that the size of an array cannot be modified (i.e. if you want to append/add or remove element(s) to/from an array, you have to create a new array.

How do you insert an item at a specific location in an ArrayList object?

Use ArrayList. add(int index, E element) method to add element to specific index of ArrayList. To replace element at specified index, use ArrayList. set(int index, E element) method.

What is a method header?

The Structure of a Method You have a method header, and a method body. The header is where you tell Java what value type, if any, the method will return (an int value, a double value, a string value, etc). As well as the return type, you need a name for your method, which also goes in the header.

How do you find the size of an ArrayList?

The size of an ArrayList can be obtained by using the java. util. ArrayList. size() method as it returns the number of elements in the ArrayList i.e. the size.

Can ArrayList store different data types?

The ArrayList class implements a growable array of objects. ArrayList cannot hold primitive data types such as int, double, char, and long. Now, in order to hold primitive data such as int and char in ArrayList are explained. Primitive data types cannot be stored in ArrayList but can be in Array.