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Chapter 7: Problem 23

What import statement must you include in your code in order to use the Array List class?

Short Answer

Expert verified
Answer: To use the ArrayList class, include the following import statement at the beginning of the Java program: ```java import java.util.ArrayList; ```

Step by step solution

01

Locate the ArrayList class

The ArrayList class is in the java.util package.
02

Write the import statement

To use the ArrayList class in your code, add the following import statement at the beginning of your Java program: ```java import java.util.ArrayList; ```

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Import Statement
In Java programming, an import statement is a key aspect of using pre-written classes and interfaces located within various packages. Import statements allow you to bring specific classes or entire packages into your programming file, enabling you to use their functionalities without writing them from scratch. For example, to utilize the `ArrayList` class, you would include an import statement at the very top of your Java file:
  • This import allows Java to recognize the `ArrayList` class.
  • Without this statement, Java will not understand any references to `ArrayList` in your code.
Adding the correct import statement helps organize your code and makes it more efficient by leveraging pre-existing code packaged in built-in classes.
java.util Package
Java organizes its standard library classes into a hierarchical structure composed of packages. The `java.util` package is a part of this structure, and it contains a collection of utility classes that provide additional functionality to Java developers.
  • This package includes data structures like lists, maps, sets, and queues.
  • The `ArrayList` class, a fundamental data structure in Java programming, is also a part of the `java.util` package.
By importing the `java.util.ArrayList`, you gain access to a dynamic array that is part of Java's wealth of utility functionalities, allowing for more advanced data handling and manipulation in applications.
Java Programming
Java programming is a widely-used object-oriented programming language, renowned for its platform independence and extensive library support. One of the language's key strengths is its robust set of core libraries and the organization into packages.
  • In Java programming, you can enhance your applications by leveraging these ready-made components.
  • Classes like `ArrayList` are part of Java's fundamental offerings, providing developers with powerful tools to manage collections of objects easily.
Learning to effectively utilize these built-in classes and interfaces, through import statements and package usage, is crucial for any Java programmer aiming to write clean, efficient, and functional code.

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Most popular questions from this chapter

a) Write a statement that declares a string array initialized with the following strings: "Mercury", "Venus", "Earth", and "Mars". b) Write a loop that displays the contents of cach element in the array you declared in A. c) Write a loop that displays the first character of the strings stored in cach element of the array you declared in A. (Hint: Use the string class's charat method discussed in Chaprer \(2 .\)

Write a statement that creates an Array list object and assigns its address to a variable named 1 lards. The Array list should be able to store string objects only.

If a sequential search is performed on an array, and it is known that some items are searched for more frequently than others, how can the contents of the array be reordered to improve the average performance of the search?

What happens in Java when a program trics to use a subscript that is out-of bounds?

Write a method named zero, which accepts an int array as an argument and stores the value 0 in cach element.
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