Description
Objectives
Getting familiar with the Eclipse environment
Creating a Java project; creating and editing a Java program Adding a library to the build path
Running project inside and outside Eclipse
Source files
components.jar HeapSort.java
1 Introduction
Welcome to the first lab. These labs are generally intended to let you explore concepts introduced in the course lectures. During each lab, you need to follow the instructions from problem setup to deliverables. This lab contains 3 deliverables, which you should demo to the lab instructor.
1.1 Eclipse
The Eclipse platform is a generic integrated development environment (IDE) foundation without any focus on a specific programming language. The platform contains IDE functionality and is built with components creating applications by using component subsets. Developers create, share and edit generic projects and files in the platform, while participating within a multiple team development environment repository.
However, it is written mostly in Java and most of the time is used to develop applications in this programming language, but it covers other languages such as: C, C++, Ruby, R, JavaScript, PHP, Python …
In this lab we will focus on Eclipse usage in writing, editing and running Java programs.
1.2 Java Requirements of Eclipse
Eclipse requires an installed Java runtime (at least Java 5). Java can be downloaded in two flavors, a JRE (Java runtime environment) and a JDK (Java development tools) version. The Eclipse IDE contains its own Java compiler hence a JRE is sufficient for most tasks with Eclipse. The JDK version of Java is required if you compile Java source code on the command line and for advanced development scenarios, for example if you use automatic builds or if you develop Java web applications.
public static void main
1.3 Eclipse Resources
-
Resource
URL
Eclipse Homepage
Download Eclipse
Eclipse Online Tutorials
2 Deliverable 1 — Create and Run a Simple Java Program (Heap Sort)
Sort a list of integers using the heap sort algorithm:
http://www.youtube.com/watch?v=WYII2Oau_VY (Super short, no words, pictures only)
http://www.youtube.com/watch?v=B7hVxCmfPtM (The traditional version from M.I.T., very, very long) Or find your own
Note: Write carefully, you are going to reuse this code later!
Step 1: Launch Eclipse
Open the Eclipse IDE. It can be done at terminal by typing eclipse . Step 2: Create a new project
Select File => New => Java Project => Name your project => Finish. Step 3: Add a new class
Select your project => File => New ⇒ Class => Name the class => check (String[] args) => Finish.
For this lab, just copy the source file HeapSort.java and paste into the src folder of the project. Step 4: Implement your class
Finish the sort method.
Step 5: Run you code
Run the code (Run as => Java application).
DEMO this deliverable to the lab instructor.
3 Deliverable 2 — Add a Library to the Build Path
In this part, we want you to edit your source code and add a library to the build path.
3.1 Edit Your Code
An import statement is a way of making more of the functionality of Java available to your program. Java can do a lot of things, but you do not need all of them so often. It has its classes divided into packages. Your own classes are part of packages, too. So, anything that isn’t in the java.lang package or the local package needs to be imported.
Step 1: Import libraries
Add the two following imports to the beginning of your source code:
import components.simplewriter.SimpleWriter;
import components.simplewriter.SimpleWriter1L;
Step 2: Rewrite the output code
Edit your print / println commands by instantiating an object of SimpleWriter . For example, substitute:
System.out.println(array[c]);
with:
SimpleWriter out = new SimpleWriter1L();
out.println(array[c]);
out.close();
Step 3: Compile and run
|
javac HeapSort.java |
# |
Now you can find the file HeapSort.class at your home directory |
|
java HeapSort |
# |
Do not add the “.class” extension |
DEMO this deliverable to the lab instructor.
