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Advanced Java Programming Adam Gerber, PhD, SCJP office: Ryerson CS Lab 4 th Floor office hrs: 3:30-5:30pm Wed.

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Presentation on theme: "Advanced Java Programming Adam Gerber, PhD, SCJP office: Ryerson CS Lab 4 th Floor office hrs: 3:30-5:30pm Wed."— Presentation transcript:

1 Advanced Java Programming Adam Gerber, PhD, SCJP office: Ryerson CS Lab 4 th Floor office hrs: 3:30-5:30pm Wed

2 Survey of the class Your name, hailing from, what you studied in undergrad, what you want to accomplish with this degree? (waive option) Android Portfolio:

3 Evaluations proPres 10% proData 10% proService 10% Class participation 10% Midterm exam 15% proWeb 20% (final project) Team Project 25%

4 Project Due Dates proPres: due Tues July 15 at 11:59pm proData: due Tues July 22 at 11:59pm proService: due Tues July 29 at 11:59pm proWeb: due Tues September 2 at 11:59pm

5 Team Projects Each team will be responsible for: 1/ creating a deck of slides describing the architecture of the technology Each team member will be responsible for: 1/ creating a lab using the course tools Maven/Git/NetBeans and making their lab available on bitbucket as public repo. 2/ lecturing for 1/2 hour on that lab in weeks 7, 8, or 9. See course website for dates: class.cs.uchicago.edu/adv/

6 Piazza Piazza: https://piazza.com/uchicago/summer2014/mpcs51 037/home Course website:

7 Lecture 01 Agenda: 1/ intro 2/ bitBucket register 3/ setup dev environment JDK, maven, git, sourcetree, p4merge, netBeans 8, glassfish 4/ intro to maven, netbeans, & git

8 Registering Bitbucket account Remote source-control:

9 Set-up dev enviornment: ~/content/java_adv_install.txt

10 Java Java is modeled after C++ The majority of runtime errors in a C++ program are due to improper memory management (memory leaks). Java is a memory-managed environment. In practice, that means you don’t have to worry about de-allocating memory when an object which was allocated on the heap falls out of scope. Garbage collected. Since JEE and JSE 1.5+, you may let the run-time environment manage both the allocation and de- allocation of objects.

11 Java memory mgmt We are responsible for allocating memory on the heap using the new keyword. The JVM is responsible for de-allocating memory with the garbage collector. The finalize() method is the closest we can get to intercepting de-allocation. Date date = new Date("11/18/2007"); System.out.println(date.toString()); //program exits The run-time environment (JEE container or JVM 1.5+) is responsible for de- allocating AND allocating memory on the Date date; System.out.println(date.toString()); //program exits

12 Java Java is Write Once Run Anywhere (WORA). A java program can run on any platform that has a JVM. A Java WAR file can run on any JEE compliant web-server, such as Tomcat, JBoss, Wirefly, Glassfish.

13 What Sun (now Oracle) says about Java “…we designed Java as closely to C++ as possible in order to make the system more comprehensible. Java omits many rarely used, poorly understood, confusing features of C++ that, in our experience, bring more grief than benefit.”

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19 Architecture Neutral Java Code is compiled to.class files which are interpreted as bytecode by the JVM. (.NET does this too; only you’re trapped in an MS op system.) JIT compilers like HotSpot are very fast – little difference between in performance between machine-binary and interpreted byte-code.

20 Strictly OO Java is strictly Object-Oriented. Java code must be encapsulated inside a class. No procedural programming; and no spaghetti code.

21 Implementation Independence A java int is ALWAYS 32bits; regardless of operating system. A java long is ALWAYS 64bits. Etc. The same is not true of C/C++.

22 No Pointers There are no pointers in Java Instead Java uses references; which for all intents and purposes, behave like pointers.

23 Version numbers in Java Jdk1.5 == Java 5.0 Jdk1.6 == Java 6.0 Jdk1.7 == Java 7.0

24 Wrapper Classes Every primitive has a corresponding Wrapper class. For example; double has Double, int has Integer, boolean has Boolean, char has Character, etc. These wrapper classes can be very useful when storing values in collections which require you to use objects, and forbid the use of primitives.

25 The API Documentation of the Standard Java Library

26 Object heirarchies You can also see the API online. Determine the version you using by typing> java –version Class hierarchies. The Object class is the grand-daddy of ALL java classes. Every class inherits methods from Object. And from all its other ancestry. Even if you create a class that extends no other classes, you still extend Object by default.

27 Class Object A blueprint is to a house as a class is to an object Class = Blueprint

28 Class Objects

29 Class Object A blueprint is to a car as a class is to an object Class = Blueprint

30 Class Objects

31 Spot the “class” here

32 Pass by value and reference

33 pass by value pass by reference Action: Tell my accountant how much I intend to spend on a new car. Change in bank account: no change. Action: Swipe debit card and enter pin at the Bently dealership. Change in bank account: -125k.

34 If a tree falls in a forest and no one is around to hear it, does it make a sound?

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36 Event (onClick) No Event-Listener listening No Catcher Event-Source (Button) No Event Listener

37 Event (onClick) Event-Listener listening Catcher ready to catch Event-Source (Button) OnClick- Listener Any Object

38 Wrong Event

39 Event source not registered

40 Event (onClick) Event-Listener listening Catcher ready to catch OnClick- Listener Event-Source (Button) Any Object OnMouse- Listener Event (onMouse)

41 Install Maven On Windows: verify M2_HOME is created and PATH contains M2_HOME On Mac/Linux: export M2_HOME=/home/user/java/apache-maven export PATH=/home/user/java/apache-maven /bin:${PATH} mvn --version

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48 Fork-and-Clone projects

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53 GIT architecture

54 git config --global user.name "Your Name" git config --global user.

55 add/reset/commit: move files from working-dir to stage-dir(aka index) git add. git add src/. git add src/lec01/glab/DigitalToBinary.java move files from stage-dir(aka index) to working-dir git reset HEAD. git reset head src/. git reset head src/lec01/glab/DigitalToBinary.java git commit -m “your commit message.”

56 Amending: Every commit is associated with a sha-1 hash. That hash is derived from 1/ the file changes in that commit and 2/ the previous commit. You can not change any commit unless that commit is at the head. Since no other commits depend on the head, you may safely change the head. To change the head, use git commit --amend -m “your message” git commit --amend --no-edit

57 Reverting: You can roll back a commit (reverse it) by identifying it's sha1 hash like so. git revert --no-edit 71ac

58 Branching: To list the branches in a project: git branch git branch -r git branch --all To create a branch: git checkout -b branchName c39b git checkout -b branchName To delete a branch: git branch -D branchName To checkout a branch: git checkout 7afe git checkout master

59 Pushing to remotes: To see the remotes: git remote -v show To push to a remote: git push origin master:master git push origin master git push --all

60 Pulling from remotes: To see the remotes: git remote -v show To pull from a remote: git pull --all git pull origin eval

61 NetBeans keymap


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