Transcript PowerPoint - UNC Computer Science

COMP 110/401
APPENDIX: INSTALLING AND
USING ECLIPSE
Instructor: Prasun Dewan (FB 150, [email protected])
SCOPE: BASICS AND BEYOND
Basic use: CS 1
Beyond basic use: CS2
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DOWNLOAD FROM WWW.ECLIPSE.ORG
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EXTRACT ALL
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SELECT DESTINATION FOLDER
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CREATE SOME KIND OF SHORTCUT FOR
ECLIPSE.EXE
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RUN ECLIPSE.EXE
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SPECIFY PROJECTS DIRECTORY
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REMOVE WELCOME TAB IF IT APPEARS
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ADD A NEW JAVA PROJECT
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ENTER PROJECT NAME
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SWITCH TO JAVA PERSPECTIVE (MAY GET THIS
MESSAGE)
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EMPTY PROJECT CREATED
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ADD A PACKAGE TO SELECTED PROJECT
Select project and
File Package
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ENTER PACKAGE NAME
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EMPTY PACKAGE IN NON EMPTY PROJECT
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ADD A CLASS
Select project and
File Class
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NAME THE CLASS
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EMPTY CLASS IN NON EMPTY PACKAGE
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EDIT THE FILE (COPY AND PASTE CODE)
package warmup;
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class AGreeter {
static BufferedReader inputStream = new BufferedReader(new InputStreamReader(System.in));
public static void main(String[] args) {
System.out.println("Hello World");
if (args.length > 0) {
System.out.println(args[0]);
}
try {
System.out.println (inputStream.readLine());
} catch (Exception e) {
System.out.println("Could not read line");
e.printStackTrace();
}
}
}
Copy and paste code from:
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SAVE (AND COMPILE) THE FILE
FileSave or CTRL+S
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WORKSPACE, PROJECT, SOURCE PACKAGE 
FOLDER
Workspace
Project
Source
Package
Class Source
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WORKSPACE, PROJECT, BINARY PACKAGE 
FOLDER
Workspace
Project
Binary
Package
Class Object
(Binary) Code
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EXECUTE THE MAIN METHOD ON SELECTED
CLASS
Right MenuDebug As Java
Application
Can also select Run but Debug is more
defensive
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VIEW OUTPUT IN CONSOLE WINDOW
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PROVIDE INPUT IN CONSOLE WINDOW
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THE OUTPUT AFTER ENTER
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SUPPLY USER ARGUMENT:
Right MenuDebug As Debug Configuration
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SELECT MAIN CLASS IN CONFIGURATION
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SPECIFY AND APPLY ARGUMENT IN ARGUMENT
TAB AND PRESS DEBUG
Argument must be in
quotes. Args[0] = “Ca
Va”
Without quotes Java
will make each word a
separate argument
(args[0] = “Ca”, args[1]
= “Va”
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EXECUTE WITH SUPPLIED ARG
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ARG PRINTED, PROGRAM, STILL RUNNING,
WAITING FOR INPUT
Button available in
both Debug and Java
Perspective, only of
them is active
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TERMINATED PROGRAM
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DEBUG LAST MAIN LAUNCHED: F11
No need to select a
main class
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CLOSING A WINDOW PERHAPS ACCIDENTALLY
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VANISHED CONSOLE
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WINDOWRESET PERSPECTIVE
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WINDOWSHOW VIEW
Can selectively remove and
add sub-windows/views
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TARGET
Basic use

Beyond basic use
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CREATE A PROJECT FROM EXISTING CODE
Source Code of Class Examples
Zipped Directory
JavaToHTML
Click on Zipper Directory Link
in SlideShow Mode
Unzip the zipped directory
Make a Java project out of it
by following the steps
described
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CREATE A PROJECT OUT OF EXISTING CODE:
FILENEWJAVA PROJECT
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UNCHECK DEFAULT LOCATION BOX
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ENTER LOCATION AND NAME
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NEW PROJECT CREATED
But it will have errors because of missing
ObjectEditor library
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LIBRARY LOCATION ON THE WEB
Downloads
ObjectEditor Version 3 (used in
comp110)
ObjectEditor Version 19 (used last
year)
ObjectEditor Version 20
oeall3
oeall19
oeall20
Click on the latest version to
download the jar (same as zip) and
do not unzip/unjar it
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DOWNLOAD LIBRARY TO LOCAL COMPUTER
Do not unzip/unjar it
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SELECT PROJECT, AND PROJECTPROPERTIES
Must do this for each project!
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SELECT BUILD PATH, ADD EXTERNAL JAR
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SELECT SAVED JAR
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PRESS DONE TO COMMIT
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CHANGE THE JAVA VERSION (IF NECESSARY):
WINDOWPREFERENCES
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JAVACOMPILER PREFERENCES
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REBUILD OR RECOMPILE ALL CLASSES
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EXECUTING CODE GIVES JAVA, JAVAC
INCOMPATIBILITY ERROR
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CHANGE THE JAVA VERSION:
WINDOWPREFERENCES
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PRESS SEARCH BROWSE BUTTON
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PRESS SEARCH BROWSE BUTTON TO INSTALLED
JDK (SEE APPENDIX ON INSTALLATION)
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JRE ADDED TO ECLIPSE, SELECT IT AND CAN
EXECUTE WITHOUT ERRORS
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COPY TYPES (CLASSES, INTERFACES, ENUMS)
FROM PACKAGE TO ANOTHER: COPY
Select type(s) in source project
and package and press CTRL-C
(or FileCopy right menu
item)
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COPY TYPES FROM ONE PACKAGE TO ANOTHER:
PASTE
Select package in destination
project and package and press
CTRL-V (or FilePaste right
menu item)
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COPYING CLASSES FROM ONE PACKAGE TO
ANOTHER: NEW CLASS IN NEW PACKAGE AND
PROJECT
Repackaged type added (and its
imports are changed to other copied
types if multiple types are copied and
pasted together)
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JUMPING TO IDENTIFIER DEFINITION AND
NAVIGATION STACK
ALT + Forward Arrow
goes forwards in the
navigation stack a la
browser forward
button
ALT + Back Arrow takes
you back where you
came from, a la
Browser back button,
can execute multiple
times to back in in the
stack of visited points
F3 when cursor is a start
of an identifier
Makes Eclipse take you to
the definition of the
identifier in an edit window
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FIND THE USES
CTRL-SHIFT-G when cursor is a
start of an identifier
Double clicking a method
reference
Makes Eclipse show the
methods that reference the
identifier in the search tab
Makes Eclipse show the method
and highlight all references of
the identifier
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MULTI FILE TEXT SEARCH FOR PRINTLN
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SEARCH RESULTS
Use CTR+SHIFT+G (shown earlier) to find
active uses of the method
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MENUREFACTORRENAME IDENTIFIER: ALT +
SHIFT + R
Select type, right
menuRefactorRename
All references will be updated!
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COMPLETE IDENTIFIER: CTRL + SPACE AFTER
PREFIX
public static final long NUMBER_OF_LARGE_FACTORIAL_COMPUTATIONS
= 1000000;
Give file name
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UNDERSTAND AND CORRECT ERRORS
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CORRECT ALL IMPORT ERRORS IN FILE: CTRL +
SHIFT + O
In Eclipse press CTRL-SHIFT-O to
automatically import all used types that
need to be imported but have not been
imported
If class is in more than one package,
Eclipse gives a choice
All unused imports are also removed
Can select multiple types or a project to
refresh all imports in the selected
types/project
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SET A BREAK POINT OR TEL ECLIPSE TO STOP
WHEN IT REACHED SOME LINE
Double clicking again will remove dot and
break point
Can also use right menu in side bar to
enable and disable break point
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DEBUG PROGRAM AND ENTER INPUT
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MAY GET THIS MESSAGE BEFORE BREAK POINT
HIT
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DEBUG PERSPECTIVE AND STOPPING AT
BREAKPOINT
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RUNSTEP OVER TO NEXT STATEMENT (F6)
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STOPPED AT NEXT STATEMENT
Local variable
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RUNSTEP INTO SETNUMBER (F5)
Call stack
Called method
parameters
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RUNSTEP RETURN
OR
F7
Call stack
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STEP OVER AND THEN STREP INTO GETFACTORIAL
Elided (Collapsed)
Instance Vars
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EXAMINE VARIABLES
Expanded Instance
Vars
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STEP INTO RECURSINGFACTORIAL
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STEP OVER IF
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STEP INTO RECURSIVE CALL
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EXAMINE PARENT CALL
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STEP OVER IF
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STEP INTO YET ANOTHER RECURSIVE CALL
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RUNRESUME TO NEXT BREAK POINT OR USER
INPUT (NO MORE SINGLE STEPPING)
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ENTER NEGATIVE NUMBER TO TERMINATE
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STOPPING AGAIN AT BREAKPOINT
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TERMINATED IN DEBUG PERSPECTIVE
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RETURN TO JAVA PERSPECTIVE
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JUNIT: NEW CLASS WITHOUT MAIN
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JUNIT: INSTALL JUNIT
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JUNIT ADDED AND IMPORTED
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RUN JUNIT
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JUNIT RESULT
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RETURNING TO JAVA PERSPECTIVE
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FINDING THE DEFINITION
CTRL + SHIFT + G
before a identifier
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FINDING THE DEFINITION
F3 before a use
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EXAMINING MAIN PARAMETERS
Main
Parameters
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NEW OUTPUT AND LOCAL VARIABLE
Index gets
initialized
println()
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STEP OVER
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STEP INTO NEXT LINE (SAME AS STEP OVER)
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TERMINATING RUNNING PROGRAM
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STEP INTO SETNUMBER (RUNSTEP INTO OR F5)
Call stack
Called method
parameters
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STEP RETURN STEP RETURN OR F7
Call stack
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STEP OVER AND THEN STREP INTO GETFACTORIAL
Elided (Collapsed)
Instance Vars
10
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EXAMINING VARIABLES
Expanded Instance
Vars
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STEP INTO RECURSINGFACTORIAL
10
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STEP OVER IF
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0
STEP INTO RECURSIVE CALL
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EXAMINING PARENT CALL
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STEP OVER
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STEP INTO YET ANOTHER RECURSIVE CALL
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RESUME TO NEXT BREAK POINT OR USER INPUT
(NO MORE SINGLE STEPPING)
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ENTER NEGATIVE NUMBER TO TERMINATE
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STOPPING AGAIN AT BREAKPOINT
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TERMINATED
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RETURNING TO JAVA PERSPECTIVE
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TWO OTHER USEFUL BUT COMPLICATED
REFACTOR OPTIONS
Change method signature
Will try to update references to match the signature,
which can be erroneous
Extract interface of class C
Will create interface of selected public methods and
will make the interface the type of all variables
declared to be of class type
Adds potentially unwanted comments to method
headers and sometimes updates to references have
not worked in the past for me
Maybe better to get all references and update them
individually for both purposes
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