Starting Out with Java: From Control Structures through Objects (7th Edition) (What's New in Computer Science)
Question
Book Icon
Chapter 7, Problem 2FTE
Program Plan Intro

Array:

An array is defined as a group that consists of similar data types.

  • The array size must be specified by an “int” value and not long or short.
  • In Java, all arrays are allocated dynamically.
  • An array is always indexed, starting from 0.

Declaration of an array Variable:

  • An array variable is declared with [] after the data type.
  • The following is the syntax for declaring an array variable.
    • elementType[] arrayRefVar;

      or

    • elementType arrayRefVar[];
  • Both the above given statements can be used, but the former one is mostly used.
  • The element type can be any data type and the same data type must be used by all the elements.
  • The values are given inside the initialization list, the list is given inside the braces.

Example:

int[ ] arr;

char[ ] arr;

Array with initialization list:

int[ ] arr = {1, 2, 3, 4};

Declaring an array reference and creating an array:

  • To insert elements to an array, first an array has to be created by using new operator and then the reference variable is assigned.
  • The syntax is as follows,

arrayRefVar = new elementType[arraySize]

  • From the above statement it is clear that, an array is created using new elementType[arraySize] and then the reference to the newly created array is assigned to the variable arrayRefVar.
  • It is possible to declare an array variable, create an array and assign the reference to a variable in a single statement itself.

The syntax will be as follows,

elementType[]arrayRefVar = new elementType[arraySize];

elementType arrayRefVar[]= new elementType[arraySize);

Example:

double myFile = new double[20];

  • The statement given above declares an array variable myFile and then creates an array that consists of 20 elements which are of the datatype double and at last assign the reference to myFile.

Blurred answer
Students have asked these similar questions
Change the following code so that there is always at least one way to get from the left corner to the top right, but the labyrinth is still randomized. The player starts at the bottom left corner of the labyrinth. He has to get to the top right corner of the labyrinth as fast he can, avoiding a meeting with the evil dragon. Take care that the player and the dragon cannot start off on walls. Also the dragon starts off from a randomly chosen position   public class Labyrinth {    private final int size;    private final Cell[][] grid;     public Labyrinth(int size) {        this.size = size;        this.grid = new Cell[size][size];        generateLabyrinth();    }     private void generateLabyrinth() {        Random rand = new Random();        for (int i = 0; i < size; i++) {            for (int j = 0; j < size; j++) {                // Randomly create walls and paths                grid[i][j] = new Cell(rand.nextBoolean());            }        }        // Ensure start and end are…
Change the following code so that it checks the following 3 conditions: 1. there is no space between each cells (imgs) 2. even if it is resized, the components wouldn't disappear 3. The GameGUI JPanel takes all the JFrame space, so that there shouldn't be extra space appearing in the frame other than the game.   Main():         Labyrinth labyrinth = new Labyrinth(10);         Player player = new Player(9, 0);        Dragon dragon = new Dragon(9, 9);         JFrame frame = new JFrame("Labyrinth Game");        GameGUI gui = new GameGUI(labyrinth, player, dragon);         frame.add(gui);        frame.setSize(600, 600);        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        frame.setVisible(true);   public class GameGUI extends JPanel {    private final Labyrinth labyrinth;    private final Player player;    private final Dragon dragon; //labyrinth, player, dragon are just public classes     private final ImageIcon playerIcon = new ImageIcon("data/images/player.png");…
Make the following game user friendly with GUI, with some simple graphics. The GUI should be in another seperate class, with some ImageIcon, and Game class should be added into the pane. The following code works as this: The objective of the player is to escape from this labyrinth. The player starts at the bottom left corner of the labyrinth. He has to get to the top right corner of the labyrinth as fast he can, avoiding a meeting with the evil dragon. The player can move only in four directions: left, right, up or down. There are several escape paths in all labyrinths. The player’s character should be able to moved with the well known WASD keyboard buttons. If the dragon gets to a neighboring field of the player, then the player dies. Because it is dark in the labyrinth, the player can see only the neighboring fields at a distance of 3 units.  Cell Class: public class Cell { private boolean isWall; public Cell(boolean isWall) { this.isWall = isWall; } public boolean isWall() { return…

Chapter 7 Solutions

Starting Out with Java: From Control Structures through Objects (7th Edition) (What's New in Computer Science)

Ch. 7.2 - A program has the following declaration: double[]...Ch. 7.2 - Look at the following statements: int[] a = { 1,...Ch. 7.3 - Prob. 7.13CPCh. 7.3 - Write a method named zero, which accepts an int...Ch. 7.6 - Prob. 7.15CPCh. 7.7 - Recall that we discussed a Rectangle class in...Ch. 7.10 - Prob. 7.17CPCh. 7.11 - What value in an array does the selection sort...Ch. 7.11 - How many times will the selection sort swap the...Ch. 7.11 - Prob. 7.20CPCh. 7.11 - Prob. 7.21CPCh. 7.11 - If a sequential search is performed on an array,...Ch. 7.13 - What import statement must you include in your...Ch. 7.13 - Write a statement that creates an ArrayList object...Ch. 7.13 - Write a statement that creates an ArrayList object...Ch. 7.13 - Prob. 7.26CPCh. 7.13 - Prob. 7.27CPCh. 7.13 - Prob. 7.28CPCh. 7.13 - Prob. 7.29CPCh. 7.13 - Prob. 7.30CPCh. 7.13 - Prob. 7.31CPCh. 7 - In an array declaration, this indicates the number...Ch. 7 - Each element of an array is accessed by a number...Ch. 7 - The first subscript in an array is always. a. 1 b....Ch. 7 - The last subscript in an array is always. a. 100...Ch. 7 - Array bounds checking happens. a. when the program...Ch. 7 - This array field holds the number of elements that...Ch. 7 - Prob. 7MCCh. 7 - This search algorithm repeatedly divides the...Ch. 7 - Prob. 9MCCh. 7 - When initializing a two-dimensional array, you...Ch. 7 - Prob. 11MCCh. 7 - To delete an item from an ArrayList object, you...Ch. 7 - To determine the number of items stored in an...Ch. 7 - True or False: java does not allow a statement to...Ch. 7 - True or False: An arrays sitze declarator can be a...Ch. 7 - Prob. 16TFCh. 7 - True or False: The subscript of the last element...Ch. 7 - Prob. 18TFCh. 7 - True or False: The Java compiler does not display...Ch. 7 - Prob. 20TFCh. 7 - True or False: The first size declarator in the...Ch. 7 - Prob. 22TFCh. 7 - Prob. 23TFCh. 7 - int[] collection = new int[-20];Ch. 7 - Prob. 2FTECh. 7 - Prob. 3FTECh. 7 - Prob. 4FTECh. 7 - Prob. 5FTECh. 7 - The variable names references an integer array...Ch. 7 - The variables numberArray1 and numberArray2...Ch. 7 - Prob. 3AWCh. 7 - In a program you need to store the populations of...Ch. 7 - In a program you need to store the identification...Ch. 7 - Prob. 6AWCh. 7 - Prob. 7AWCh. 7 - Prob. 8AWCh. 7 - Prob. 9AWCh. 7 - Prob. 10AWCh. 7 - Prob. 11AWCh. 7 - Prob. 1SACh. 7 - Prob. 2SACh. 7 - Prob. 3SACh. 7 - Prob. 4SACh. 7 - Prob. 5SACh. 7 - Prob. 6SACh. 7 - Prob. 7SACh. 7 - Prob. 8SACh. 7 - Prob. 9SACh. 7 - Rainfall Class Write a RainFall class that stores...Ch. 7 - Payroll Class Write a Payroll class that uses the...Ch. 7 - Charge Account Validation Create a class with a...Ch. 7 - Charge Account Modification Modify the charge...Ch. 7 - Prob. 5PCCh. 7 - Drivers License Exam The local Drivers License...Ch. 7 - Magic 8 Ball Write a program that simulates a...Ch. 7 - Grade Book A teacher has five students who have...Ch. 7 - Grade Book Modification Modify the grade book...Ch. 7 - Average Steps Taken A Personal Fitness Tracker is...Ch. 7 - Array Operations Write a program with an array...Ch. 7 - Prob. 12PCCh. 7 - Sorted List of 1994 Gas Prices Note: This...Ch. 7 - Name Search If you have downloaded this books...Ch. 7 - Population Data If you have downloaded this books...Ch. 7 - World Series Champions If you have downloaded this...Ch. 7 - 2D Array Operations Write a program that creates a...Ch. 7 - Prob. 18PCCh. 7 - Trivia Game In this programming challenge, you...Ch. 7 - Prob. 20PC
Knowledge Booster
Background pattern image
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
EBK JAVA PROGRAMMING
Computer Science
ISBN:9781337671385
Author:FARRELL
Publisher:CENGAGE LEARNING - CONSIGNMENT
Text book image
C++ for Engineers and Scientists
Computer Science
ISBN:9781133187844
Author:Bronson, Gary J.
Publisher:Course Technology Ptr
Text book image
Programming Logic & Design Comprehensive
Computer Science
ISBN:9781337669405
Author:FARRELL
Publisher:Cengage
Text book image
C++ Programming: From Problem Analysis to Program...
Computer Science
ISBN:9781337102087
Author:D. S. Malik
Publisher:Cengage Learning
Text book image
Programming with Microsoft Visual Basic 2017
Computer Science
ISBN:9781337102124
Author:Diane Zak
Publisher:Cengage Learning
Text book image
Microsoft Visual C#
Computer Science
ISBN:9781337102100
Author:Joyce, Farrell.
Publisher:Cengage Learning,