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1)Examine the above code that creates the array:    a)How is the base type of the array specified?     b)How is the length of the array specified?    c)How many Strings are actually stored in the array after the array has been created?    d)How is the base type of the ArrayList specified?     e)How is the capacity of the ArrayList specified?    f)What is the capacity of the ArrayList?    g)What is the size of the ArrayList?

1)Examine the above code that creates the array:    a)How is the base type of the array specified?     b)How is the length of the array specified?    c)How many Strings are actually stored in the array after the array has been created?    d)How is the base type of the ArrayList specified?     e)How is the capacity of the ArrayList specified?    f)What is the capacity of the ArrayList?    g)What is the size of the ArrayList?

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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1)Examine the above code that creates the array:

   a)How is the base type of the array specified? 

   b)How is the length of the array specified?

   c)How many Strings are actually stored in the array after the array has been created?

   d)How is the base type of the ArrayList specified? 

   e)How is the capacity of the ArrayList specified?

   f)What is the capacity of the ArrayList?

   g)What is the size of the ArrayList?

**Creating Arrays and ArrayLists in Java** ### Creating an Array of Strings Recall that the code to create an array of Strings is: ```java String[] array = new String[3]; ``` ### Understanding ArrayLists An `ArrayList` is similar to an array, except it is: - **Resizable**, meaning that it will automatically grow when needed. Unlike an array that only has unchangeable length, an `ArrayList` has: - **size**: the number of items currently in the `ArrayList` - **capacity**: the number of positions currently in the `ArrayList` - A Java class with methods. We cannot use `[]` notation with an `ArrayList`. ### Creating an ArrayList of Strings Here is the code that creates an `ArrayList` of Strings: ```java ArrayList<String> list = new ArrayList<String>(3); ``` ### Visualizing the ArrayList Below is a diagram showing how we might visualize that `ArrayList` of Strings: ``` [_____] [_____] [_____] ``` This diagram represents an `ArrayList` with an initial capacity of 3, but unlike an array, the `ArrayList` can grow dynamically as more elements are added beyond this capacity.
Transcribed Image Text:**Creating Arrays and ArrayLists in Java** ### Creating an Array of Strings Recall that the code to create an array of Strings is: ```java String[] array = new String[3]; ``` ### Understanding ArrayLists An `ArrayList` is similar to an array, except it is: - **Resizable**, meaning that it will automatically grow when needed. Unlike an array that only has unchangeable length, an `ArrayList` has: - **size**: the number of items currently in the `ArrayList` - **capacity**: the number of positions currently in the `ArrayList` - A Java class with methods. We cannot use `[]` notation with an `ArrayList`. ### Creating an ArrayList of Strings Here is the code that creates an `ArrayList` of Strings: ```java ArrayList<String> list = new ArrayList<String>(3); ``` ### Visualizing the ArrayList Below is a diagram showing how we might visualize that `ArrayList` of Strings: ``` [_____] [_____] [_____] ``` This diagram represents an `ArrayList` with an initial capacity of 3, but unlike an array, the `ArrayList` can grow dynamically as more elements are added beyond this capacity.
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