Java Development in Eclipse
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Questions and Answers

What must be included in the multi-line comment block at the top of each source code file?

  • Program version and last compiled date
  • My full name and professor's name
  • Description of the program and environment setup
  • All of the above (correct)

Where are .java files located after creating a project in Eclipse?

  • bin folder
  • src folder (correct)
  • documents folder
  • api folder

What is the default file extension for UMLet diagrams?

  • .uxf (correct)
  • .class
  • .java
  • .txt

Which perspective in Eclipse is used for editing and compiling code?

<p>Java perspective (D)</p> Signup and view all the answers

How do you add a horizontal line in a UML Class Diagram in UMLet?

<p>Enter two hyphens in the properties for the diagram (B)</p> Signup and view all the answers

Is there an installer for Eclipse after downloading and extracting the installer?

<p>No, it is a standalone application (A)</p> Signup and view all the answers

What is the difference between double and Double?

<p>double is a primitive type, Double is a wrapper class (B)</p> Signup and view all the answers

What folder does Eclipse use to store all projects?

<p>workspace (A)</p> Signup and view all the answers

What data type does the format specifier %d work with?

<p>int (A)</p> Signup and view all the answers

During the hybrid 2 activity, what was the output of a specific program?

<p>0.9999999999999999 (A)</p> Signup and view all the answers

What does %n do when used in a format String?

<p>Writes an operating system appropriate line terminator into the output (C)</p> Signup and view all the answers

How do you set a breakpoint in Eclipse?

<p>Double click on the grey margin on the left side of the source code view (D)</p> Signup and view all the answers

In UMLet, what type of diagram are we currently learning to use?

<p>UML Class Diagram (C)</p> Signup and view all the answers

Who created Git?

<p>Linux Torvalds and the Linux community (C)</p> Signup and view all the answers

What is Git?

<p>Git is a distributed (local and remote) version control system (B)</p> Signup and view all the answers

What is the Git command git init used for?

<p>To create a new repository (B)</p> Signup and view all the answers

What is the primary purpose of adding a file to the staging area in Git?

<p>To take a snapshot of the file that has changes (C)</p> Signup and view all the answers

Where are reference types (objects) stored in memory during program execution?

<p>Heap (D)</p> Signup and view all the answers

What does a method call within the Method Call Stack refer to?

<p>Stack frame (B)</p> Signup and view all the answers

Which setting is recommended for the HOME system environment variable when working with Git in Windows?

<p>%USERPROFILE% (C)</p> Signup and view all the answers

To start tracking changes to project files in Eclipse, what submenu should be used?

<p>Team &gt; Add to Index (A)</p> Signup and view all the answers

Which project folder should be included in the .gitignore settings file?

<p>/bin/ (B)</p> Signup and view all the answers

What is the primary use of the Heap in memory management?

<p>Storing reference types (objects) (D)</p> Signup and view all the answers

After modifying a source code file, how do you commit the changes with Git in Eclipse?

<p>Right-click and select Team &gt; Commit (D)</p> Signup and view all the answers

What is placed into the box representing a variable of a reference-type that does not reference an object?

<p>null (A)</p> Signup and view all the answers

What is placed into the box representing a variable of a primitive type?

<p>the literal value (C)</p> Signup and view all the answers

Are Strings in Java classified as a reference type?

<p>yes (A)</p> Signup and view all the answers

When memory mapping a reference type, what notation is used to annotate the class name?

<p>{ and } (A)</p> Signup and view all the answers

What representation is used to illustrate array elements in memory mapping?

<p>a column, or row of contiguous boxes (C)</p> Signup and view all the answers

What would a memory map look like for the code 'Sheep[] sheeps = null'?

<p>A box with null in it (A)</p> Signup and view all the answers

For the code 'Sheep[] sheeps = new Sheep[2];', what does the memory map illustrate?

<p>A variable with ref pointing to an array, but each element is null (A)</p> Signup and view all the answers

Given 'Sheep[] sheeps = { new Sheep(), new Sheep() };', how is this represented in memory mapping?

<p>A variable with ref pointing to an array with initialized Sheep objects (D)</p> Signup and view all the answers

What is the outcome of writing 'Sheep[] sheeps = new Sheep[200000];' when 'sheeps' is not initialized?

<p>A syntax error occurs due to the empty array. (C)</p> Signup and view all the answers

Which statement accurately describes the memory map of 'Sheep[] sheeps = new Sheep[200000];'?

<p>The memory map will show an array object with null in each element. (A)</p> Signup and view all the answers

What should constructors avoid in terms of console input/output?

<p>Including print statements during object instantiation. (C)</p> Signup and view all the answers

Why is it advisable to avoid using static for every variable or method?

<p>Static usage restricts the multi-instance capabilities of classes. (C)</p> Signup and view all the answers

What design problem is associated with the createReport() method in class orange?

<p>It performs excessive tasks that confuse functionality. (C)</p> Signup and view all the answers

What is the benefit of marking fields as private?

<p>It protects the class from unintended external modifications. (A)</p> Signup and view all the answers

What is a consequence of not using 'this' in static methods?

<p>It leads to ambiguity in variable access. (D)</p> Signup and view all the answers

What should be avoided when using accessors and mutators?

<p>Including user input through console. (B)</p> Signup and view all the answers

Flashcards

Eclipse project location

Java source files are stored in the project's 'src' folder within Eclipse.

Eclipse development environment

Eclipse's 'Java perspective' is used for editing, compiling, and debugging Java code.

Floating-point imprecision

Calculations with floating-point numbers (like 0.1 + 0.2) might produce slightly unexpected results due to how computers store these numbers.

Eclipse project storage

Eclipse stores projects within a workspace folder.

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Java API

A set of pre-built functions and classes provided by Java, making it easier to use.

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Breakpoint in Eclipse

A breakpoint in Eclipse allows you to pause program execution at a specific line of code to inspect values during debugging.

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UML Class Diagram

A diagram that shows the classes involved in a system, their attributes, and methods.

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UML Diagram template

A pre-made object in UMLet to start a class diagram.

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Staging area in Git

A temporary location where changes are stored before they are committed to the repository.

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Add file to staging area

Command used to prepare files for inclusion in the next commit.

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Git ignore file

Specifies files or directory patterns that Git should not track.

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HOME system environment variable (Windows)

The recommended path for Git when working in both Eclipse and via command line.

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Git Repository

A centralized location for storing project files and their version history.

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Add to index (Git)

Prepares modified files for inclusion in the next commit in Git.

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.gitignore

A file that specified files or directories to be excluded from Git version control.

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Commit (Git)

Saves changes to a Git repository.

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UML Class Diagram Horizontal Line

Adding a horizontal line in a UML Class Diagram in UMLet is done by entering two hyphens in the diagram's properties.

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double vs. Double (Java)

double is a primitive data type in Java, while Double is the corresponding wrapper class.

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Format Specifier %s

The format specifier %s in Java is used for String data type.

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Format Specifier %d

The format specifier %d in Java is used for int data type.

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Format Specifier %f

The format specifier %f in Java is used for double data type.

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Format Specifier %n

The format specifier %n in Java inserts a platform-appropriate line terminator.

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Version Control (Software)

Version control software tracks changes made to files over time, enabling precise historical record-keeping and collaboration.

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Git Creator

Git was created by Linus Torvalds and the Linux development community.

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Memory Mapping a Null Reference Type Variable

When a variable of a reference type does not reference any object, "null" is placed in the box representing the variable in a memory map.

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Memory Mapping a Primitive Type Variable

For a variable of a primitive type, the actual literal value is placed within the box in a memory map.

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Strings in Java - Reference Type?

Strings in Java are considered reference types.

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Reference Type Mapping Annotation

When memory mapping a reference type, the class name of the object it references is written inside the memory container using ">" sign

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Array Memory Map Representation

An array's memory map is visually represented as a column or row of adjacent boxes, each representing an element.

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Memory Map: Sheep[] sheeps = null

The variable 'sheeps' is mapped to 'null', an empty reference.

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Memory Map: Sheep[] sheeps = new Sheep[2];

The variable 'sheeps' is mapped to a reference pointing to an array object of size 2. Each element defaults to null.

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Memory Map: Sheep[] sheeps = {new Sheep(), new Sheep()};

The variable 'sheeps' references an array object with 2 elements, each pointing to allocated Sheep objects.

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Array Memory Map (Empty)

An array declared but not initialized is represented as an empty box with 'ref' inside. This box points to another box with the array's name and size, where each element is 'null'.

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Array Memory Map (Initialized)

An array initialized with a size is shown as a 'ref' box pointing to a box representing the array. This box has the array's name and size, and each element references a specific object or value.

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Array Data Type

The data type of an array is specified within square brackets in the memory map alongside the array name.

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Constructor Input/Output

Constructors should not directly interact with the console, meaning no input or output using 'System.out.println()'.

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Accessor Input/Output

Accessors, which retrieve data, should not directly interact with the console. Focus on getting data, not showing it.

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Mutator Input/Output

Mutators, which modify data, should not directly interact with the console. Focus on changing data, not showing it.

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Design Issue: Overloaded Method

A method with too many responsibilities is considered poorly designed. It should be broken into smaller, focused methods.

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Private Fields

Fields marked 'private' restrict external code from directly accessing and modifying them, protecting data integrity.

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Static Fields

Using 'static' for everything makes all fields shared, preventing unique values for different objects.

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Study Notes

Multi-line Comment Block Requirements

  • Include full name and professor's name
  • Include due date and last modified date
  • Include a description of the program
  • All of the above

Eclipse Project Structure

  • Java files are located in the src folder within the project.
  • documents, bin, and api folders are also part of the project structure.

Eclipse Development Environment

  • To edit and compile code in Eclipse, use the Java perspective.

Eclipse Installer

  • The Eclipse installer does not include a separate installer program.

Eclipse Project Storage

  • Projects are stored in the workspace.

Hybrid 2 Activity Output

  • The output of the hybrid 2 activity program is 1.0.
  • Values that were not assigned as expected: Actual: 0.7999999999999999, Expected: 0.8 Values that were not assigned as expected: Actual: 0.30000000000000004, Expected: 0.3

Debugging in Eclipse

  • Resume: Runs the program.
  • Red Terminate: Ends the program.
  • Step Over: Executes the next line of the current method.

Setting Breakpoints in Eclipse

  • Double-click the grey margin in the left side of the source code view, or
  • Right-click on the grey margin and select "Toggle breakpoint".

UML Diagram Types

  • UML Class Diagram
  • UML Sequence Diagram
  • UML Activity Diagram
  • UML Deployment Diagram

UML Class Diagram Template

  • Simple Class.

UML Diagram File Extension

  • .uxf

Adding Horizontal Lines in UML Class Diagrams

  • Use hyphens in the properties of the diagram, then hit enter.

Primitive vs. Wrapper Classes

  • double is a primitive data type, and Double is a wrapper class.

Format Specifier Usage

  • %s: works with String
  • %d: works with int
  • %f: works with double

Git

  • It tracks changes made to files.
  • Can be local and remote.
  • git init: Creates a new repository.
  • git commit: Used to create snapshots of changes made.
  • When you need to stage file changes, you use git add to prepare files that have changed for commitment and use git commit to save those changes.

Method Call Stack

  • Used to store information about methods and their data during program execution.

Heap Memory

  • Used to store reference types, like objects.

Memory Mapping

  • Primitive types: store their literal values.
  • Reference types: store a reference to the object's location in memory

Memory Map for Sheep Array (null):

  • Show variable sheeps with a reference to a null pointer

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Description

Test your knowledge on setting up and managing Java projects in the Eclipse IDE. This quiz covers everything from project structure to debugging practices. Perfect for students learning Java development or preparing for exams.

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