Transcript Slide 1

Creating and running a Java program
SOME TIPS FOR USING ECLIPSE
Eclipse
 Eclipse is an Interactive Development
Environment (IDE) for Java programmers
 It provides
 A project manager to manage all Java projects
throughout the semester
 An code editor that helps write correct Java
instructions (no need for NotePad++)
 An execution environment in which one can compile,
test, and run Java programs without leaving Eclipse
(no more Command Line use)
Eclipse Workspace
 An Eclipse Workspace is simply a folder where
all Java projects for the semester will be stored
 You must remember where it is once you select it
 It must be a place where you have write access
permissions
 It must be a place that you can access when you
need it
 Example: thumb drive, Z:\ drive, portable hard drive, or
cloud storage such as DropBox, OneDrive, Box, etc.
 Make sure there is enough space in the Workspace to
hold all projects for the semester
Eclipse
Java projects
in your
workspace
Java editor –
type code
here
Error messages and
running program
output display here
Be sure
Java is
selected
Create a New Java Project
Create new
Java Project
File/New/Java Project
Create New Project – Give it a name
Name the
project
New Project in the Package Explorer
 After creating a new project as on the previous
slide, it will appear in the Package Explorer
column on the left in Eclipse
Project name
Subfolder for .java files
Java library –
contains Java API
classes such as
String, Scanner, etc.
Add a class to the project
Right-click on src. Select
New/Class
New project is
open
Adding a new Driver Class
Assign a package name
Give the class a name
If this is the driver class,
add a main method
Make sure this is checked
Click Finish
Generated code
Fill in class purpose
Fill in method
description
Fill in body
of main
method
Add Another Non-Driver class
 Use same technique without a main method
hw1
Class name
Add desired attributes
Generate Default Constructor
Deselect All to
Generate Default
Constructor
Select both
Select me
Default Constructor
Fill in the
Description
Fill in the body of the
default constructor
Generate Parameterized Constructor
 Follow the same process but do NOT deselect
the attributes (fields)
 All of the following code is generated
Resulting code so far . . .
Fill in purpose
Fill in parameter
details
Generate Getters and Setters
Choose those
you want
Select me
Remember it is not
always desirable to
have getters and
setters – depends on
what needs to remain
private
Added Getters/Setters
Depending on which are
selected in the previous
dialog, a series of getters
and setters like this is
generated
Other code generators
Comment out (or
uncomment) the
selected lines of code
Add a block of comments
to a method you have
written
Generate a toString method
for your class
Generate hashCode ( ) and
equals ( ) methods
Renaming an attribute or method
 Use Refactor / Rename to change the name of
a method or attribute of a class, a local variable,
parameter, or even the name of a class.
 This changes the name everywhere it appears
in the code.
Which import do I need?
If you refer to a class that is not in your own project or in any imported
class, Eclipse puts a red squiggly line underneath the reference
Let Eclipse help you select the right import
 Hover the mouse cursor over the underlined
word and a tool-tip will appear; choose what you
want from the tool-tip and Eclipse does rest
Click this
choice
Alternatively, do this
 Press ctrl-shift-O (letter O, not zero) and Eclipse
will fill in the correct import for you or it will list
possible imports and let you choose one
Running a program
Right-click on (or in)
the driver (code)
To run a
program
Another way to run the program …
Click me
Submitting a project
… from your workspace
Project Folder Contents in Workspace
Contains .java
files for your
project
Contains the compiled
.class files
The bin folder
This folder contains the compiled .class files. Do
NOT submit them.
The src Folder
.java files for the
project
Zip ONLY these files, naming the zipped folder
appropriately. DO NOT zip the containing folder
(src or DemoProject1)
If you are using a non-Windows machine such as a Mac or
a Linux machine, it is your responsibility to be sure your
system does NOT add extraneous folders and other items
to your zipped folder.
Zipping the files
Select the files to be
zipped and right-click
… some other
archiving tool
such as 7-zip
Use Send To
Compressed Folder
or …