Project: Module 4 Programming Assignment Overview

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來自 University of California San Diego 的課程

面向对象 Java 程序设计

2995 個評分

University of California San Diego

面向对象 Java 程序设计

2995 個評分

課程 3（共 4 門，Specialization Object Oriented Programming in Java）

你是否曾想过大型软件项目诸如Google搜索引擎是如何开发的？本课程将帮助你超越平凡编程，去学习设计和开发更加复杂的Java软件项目（尽管还没到Google搜索引擎那种级别！）我们会探索如何将一个大的项目分解为层次结构的类，以及如何通过现有的库来增强项目的功能。我们也会探究一些搜索和排序的核心算法。在学习过程中，你将要开发一个令人兴奋的有着图形用户界面（GUI）的交互式应用程序。我们期待本课能启发你去创造。你即将进入课程项目，每节课所涉及的原理概念都设计成可直接应用于项目功能拓展。视频课程同时包括核心课程内容和现实中的软件工程师的来信和故事，与正在学习本课的真实学生之间的对话，以及一些你遇到困惑时可去观看的补充视频。（本课程若发现字幕错误请发送邮件到caesarguangli@hotmail.com，谢谢！）

從本節課中

Inheritance

Now that you’re in full swing with the project, let’s take a closer look at some concepts that you have already been using in your code. Specifically, the keyword “extends”. What exactly does it mean that your program “extends PApplet”? To answer this question we’ll need to dive into the details of how Java allows for Class Hierarchies through Inheritance and Polymorphism. These fundamental and powerful concepts will serve you well in the future! We’ll use these ideas to allow for displaying markers differently. If you feel you’re already comfortable with Inheritance and Polymorphism, feel free to dive straight into the project (programming assignment) for this week. As you work with the project, feel free to have some fun and introduce new levels of class hierarchies for improved functionality.

Module Introduction: Inheritance and Polymorphism0:17

Project: Module 4 Programming Assignment Overview1:46

與講師見面

Mia Minnes
Assistant Teaching Professor
Computer Science and Engineering
Leo Porter
Assistant Teaching Professor
Computer Science and Engineering
Christine Alvarado
Associate Teaching Professor
Computer Science and Engineering

[MUSIC]

In the project for this module,

we'll be going further with our graphing of earthquakes onto the world map.

The past assignment was really neat.

You displayed earthquakes on a map, and

had their appearance determined by the magnitude of the earthquake.

But knowing the magnitude of the earthquake alone, isn't really enough

information to understand the potential impact of that event.

So we'll be going further with this idea in this module by making

the earthquakes appear differently based on the location of the earthquake,

the depth of the earthquake, and optionally the age of the earthquake.

But we'll continue to visualize the magnitude of the earthquake as the size

of the marker.

So there's a number of steps to this assignment, but

let's try to break it down to four high level goals.

The first goal is to add markers for major cities.

If you don't see your city here, please feel free to add it.

The second is to figure out if the earthquakes occurred in the land, and

if so, occurred in which country.

Then, you want to draw the earthquakes differently if they occurred in the land

or in the sea.

And you'll again change the size of the earthquake, based on its magnitude.

Now, where earthquakes occur matters.

As the threat they pose is affected by whether or not they're under water and

could cause a tsunami.

Or if they're on land and could cause physical damage to surrounding areas.

The third goal is to change the color of the marker

based on how deep the earthquake occurred.

Again, the depth of the earthquake changes its potential impact to surrounding areas.

Lastly, as an optional goal,

you can add an X to the earthquakes, which occurred in the past day.

To accomplish these goals we are using features of both inheritance and

polymorphism in Java.

So be sure to check out the videos on these topics if you are unfamiliar or

uncomfortable with those ideas.

This is one of my favorite parts of the project.

I hope you'll enjoy it too.

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