02 Feb Explain briefly how

Unit 1 discussion

Extending and Overriding

Two of the main object-oriented features of the Java programming language are the ability to inherit the code of one class, and the ability to override some of the inherited methods to affect a polymorphic behavior. In this discussion, you will explore both of these concepts and how should they be programmed.

Unzip the NetBeans project zip file (U1D1_ExtendOverride.zip) and load it into your NetBeans IDE.

Examine the loaded project, and answer these questions:

What would be the output of this program when it is run?

Why does calling toString() on the Person and Student objects return their names (“Person” and “Student”) while calling toString() on the Employee object returns “Person”?

How can we fix this such that calling toString() on the Employee object return its name as well?

Provide a screenshot of your result of your fix.

Explain, briefly, how you completed this exercise, the algorithm you used (via pseudo code or other description tools), the major issues you faced. and how you solved these issues.

Reflect on your experience and what you learned.

Response Guidelines

Comment on the response of at least one other learner.

Learning Components

This activity will help you achieve the following learning components:

Explain algorithms used to complete a fix.

Unit 2 discussion

Writing to a Text File

Reading from and writing to a text file are common tasks in Java programming. Developers often use text files in lieu of databases to store and retrieve the data that a program needs.

In this discussion, you will practice writing to a text file from within your Java program.

Create a Java program that writes your name and today’s date to a text file called “mytext.txt”.

Answer the question, should we use exception if the “mytext.txt” exists when we try to write to it? Why or why not?

Provide a screenshot of your result of your work (code + text file).

Explain, briefly, how you completed this exercise, the algorithm you used (via pseudo code or other description tools), the major issues you faced, and how you solved these issues. Reflect on your experience and what you learned.

Response Guidelines

Comment on the responses of at least one other learner.

Learning Components

This activity will help you achieve the following learning components:

Perform text input and output to and from a Java application

Explain Java exceptions and their types

Unit 3 discussion

Coloring Four Quadrants of a JavaFX Square Scene

JavaFX is a new and exciting framework to develop Java GUI applications. There is always more than one way for completing a GUI task with JavaFX.

For this discussion, you practiced using the fundamentals of JavaFX to color the four quadrants of a JavaFX square scene by creating a new JavaFX application that displays a JavaFX square scene divided into four quadrants. Each quadrant should have a different background color. (Example provided in study resources.)

Please note: The colors you use are unimportant. The important element is the fact that there are four separate colors in your final product.

Provide a screenshot of your result of your work (code + application output).

Explain, briefly, how you completed this exercise, the algorithm you used (via pseudo code or other description tools), the major issues you faced, and how you solved these issues.

Reflect on your experience and what you learned.

Response Guidelines

Comment on the responses of at least one other learner.

Learning Components

This activity will help you achieve the following learning components:

Explain how to use the Color and the Font classes

Explain algorithms used to complete a fix.

Unit 4 discussion

Handling JavaFX Events

The JavaFX framework provides more than one way to handle events. For event handlers, we could use inner classes, anonymous inner classes, or the new Java 8 feature of lambda expressions. In this discussion, you will explore these different ways of writing event handles in JavaFX.

To prepare for this discussion, you must unzip the attached NetBeans project zip file (U4D1_HandleEvents.zip) and load it into your NetBeans IDE. The project uses an inner class to handle the click event on the button node. Rewrite the event handler using either an anonymous inner class, or a lambda expression.

In this discussion:

Provide a screenshot of your result of your work (code + application output).

Explain, briefly, how you completed this exercise, the algorithm you used (via pseudo code or other description tools), the major issues you faced, and how you solved these issues.

Reflect on your experience and what you learned.

Response Guidelines

Comment on the responses of at least one other learner.

Learning Components

This activity will help you achieve the following learning components:

Describe how user actions are handled in a JavaFX application

Explain what event-driven programming means

Unit 5 discussion

Using Generic ArrayList

Java generics features ensures strong typing validation at compile time. That is, an object must be of the same type it is expected to be at compile time. Generics are applied extensively in all types of Java collection libraries.

To prepare for this discussion you must:

Create a Java program that declares an instance of ArrayList.

Add four elements to your instance representing four of your favorite food items.

Print the content of your instance of ArrayList.

Provide a screenshot of the result of your work (code + application output).

Explain briefly how you completed this exercise, the algorithm you used (via pseudo code or other description tools), the major issues you faced, and how you solved these issues. Reflect on your experience and what you learned.

Response Guidelines

Comment on the responses of at least one other learner.

Learning Components

This activity will help you achieve the following learning components:

Explain what the Java generics feature means and how it is used