http://www.cs.unm.edu/~jmonter/CS251/S12/feb15.php
Please post your questions and comments here.
Have a great weekend!
Saturday, February 11, 2012
Discussion for World of CarCraft
The Lab and pre-lab assignment for Feb. 15 are now available. As usual, a physical copy of your pre-lab assignment is due at the start of lab on February 15th. This lab has been extended and is due February 29th.
http://www.cs.unm.edu/~jmonter/CS251/S12/feb15.php
http://www.cs.unm.edu/~jmonter/CS251/S12/feb15.php
Friday, February 10, 2012
Discussion for Feb 10
Okay, so today we *tried* to look over the code from lecture 10 some more. However, we were side tracked by 4 topics "svn uses", "emacs functionality", "inheritance", and "interfaces".
Homework:
Look over the code from lecture 10 and come up with improvements
Topics for Discussion (reply for participation credit):
What is the dictionaries definition of inherit? How does this relate to inheritance in Object Oriented Programming? Do you think inheritance was a good choice to describe this? Why or why not?
What keyword is used to describe inheritance in java? What is the syntax of this keyword?
Every Class in Java inherits from another Class. If left unspecified, what Class does it inherit from? What does it mean to inherit from this class?
We saw in class that in every Class Constructor you must invoke a Constructor from the class you inherit. How is this done? Knowing this, what does it mean if your class has no default constructor? What if your class only has private constructors?
Some languages have multiple inheritance. What does this term mean? Java does not allow for an class to have more than 1 super class. How does Java allow for the benefits of multiple inheritance?
What is an interface in Java? Why would you ever use an interface?
Have a good weekend!
Homework:
Look over the code from lecture 10 and come up with improvements
Topics for Discussion (reply for participation credit):
What is the dictionaries definition of inherit? How does this relate to inheritance in Object Oriented Programming? Do you think inheritance was a good choice to describe this? Why or why not?
What keyword is used to describe inheritance in java? What is the syntax of this keyword?
Every Class in Java inherits from another Class. If left unspecified, what Class does it inherit from? What does it mean to inherit from this class?
We saw in class that in every Class Constructor you must invoke a Constructor from the class you inherit. How is this done? Knowing this, what does it mean if your class has no default constructor? What if your class only has private constructors?
Some languages have multiple inheritance. What does this term mean? Java does not allow for an class to have more than 1 super class. How does Java allow for the benefits of multiple inheritance?
What is an interface in Java? Why would you ever use an interface?
Have a good weekend!
Wednesday, February 8, 2012
Discussion for Feb. 8th
We talked about the new and improved GuessingGame.java and GGFrame.java. Make sure to look over these in the repository. There are some tricky bits in these so it is okay if you don't understand *everything* but do your best and post questions.
Topics for Discussion:
In class, we decided it was better to separate the GUI code from the GuessingGame code. Why is this a good idea? Name a few reasons and explain them in a one or two sentences.
You will notice that GuessingGame extends Object. What does this mean? What would change if we removed the extends Object portion of this declaration?
We saw a StringBuilder on line 65 of GuessingGame.java. We used this object to create a String. Why do we use this instead of concatenating Strings together using +=?
The term immutable came up in the discussion today. What does this term mean? Why is the String object immutable in Java? How do we get around String being immutable?
Look at the code here: http://pastebin.com/42arBK9j
It prints two booleans. Can you guess what they are? After guessing, compile and run. Were you correct? What is going on here?
Look at the GuessingGame files in the lecture10 package. What additional improvements can we make?
See you Friday!
Joe
Topics for Discussion:
In class, we decided it was better to separate the GUI code from the GuessingGame code. Why is this a good idea? Name a few reasons and explain them in a one or two sentences.
You will notice that GuessingGame extends Object. What does this mean? What would change if we removed the extends Object portion of this declaration?
We saw a StringBuilder on line 65 of GuessingGame.java. We used this object to create a String. Why do we use this instead of concatenating Strings together using +=?
The term immutable came up in the discussion today. What does this term mean? Why is the String object immutable in Java? How do we get around String being immutable?
Look at the code here: http://pastebin.com/42arBK9j
It prints two booleans. Can you guess what they are? After guessing, compile and run. Were you correct? What is going on here?
Look at the GuessingGame files in the lecture10 package. What additional improvements can we make?
See you Friday!
Joe
Monday, February 6, 2012
Discussion for Feb. 6
Today we went over the GGFrame.java example. You should look over this code and see what improvements can be made. How can we make it more modular?
Discussion Topics (post for participation credit):
We saw many new things today. Two of these appeared on the class declaration line of GGFrame.java: extends and implements. What does it mean to extend a class? What does it mean to implement an interface?
This brings up another question, what is an interface? You should read about interfaces here: http://docs.oracle.com/javase/tutorial/java/concepts/interface.html Post your thoughts on interfaces. Define it, post 1 (or more) pro for using an interface, post 1 (or more) cons for using an interface.
We saw the basics for implementing the ActionListener interface today. Read about it here: http://docs.oracle.com/javase/tutorial/uiswing/events/actionlistener.html then post your thoughts. When do you need to implement this interface?
We are starting to see GUI components in class. You may not know it but, there is a very large number of components that the javax.swing library provides. Look through the javax.swing library in the Java 6 API and pick 1 or 2 classes that start with a J (such as JFrame or JPanel) and explain them. When would you use these components?
The term overload came up today. Java allows us to overload both methods and constructors. What does it mean to overload a method or constructor? Give a short example using pastebin.com links.
Another term came up today Override. Override is an annotation that has been available since java 5. What is its purpose? What is the difference between overloading a method an overriding a method?
Composition came up in the discussion today. You will be doing object composition for the lab this week as well. When we are talking about composition in object oriented programming, what does it mean? Give an example.
See you Wednesday!
Discussion Topics (post for participation credit):
We saw many new things today. Two of these appeared on the class declaration line of GGFrame.java: extends and implements. What does it mean to extend a class? What does it mean to implement an interface?
This brings up another question, what is an interface? You should read about interfaces here: http://docs.oracle.com/javase/tutorial/java/concepts/interface.html Post your thoughts on interfaces. Define it, post 1 (or more) pro for using an interface, post 1 (or more) cons for using an interface.
We saw the basics for implementing the ActionListener interface today. Read about it here: http://docs.oracle.com/javase/tutorial/uiswing/events/actionlistener.html then post your thoughts. When do you need to implement this interface?
We are starting to see GUI components in class. You may not know it but, there is a very large number of components that the javax.swing library provides. Look through the javax.swing library in the Java 6 API and pick 1 or 2 classes that start with a J (such as JFrame or JPanel) and explain them. When would you use these components?
The term overload came up today. Java allows us to overload both methods and constructors. What does it mean to overload a method or constructor? Give a short example using pastebin.com links.
Another term came up today Override. Override is an annotation that has been available since java 5. What is its purpose? What is the difference between overloading a method an overriding a method?
Composition came up in the discussion today. You will be doing object composition for the lab this week as well. When we are talking about composition in object oriented programming, what does it mean? Give an example.
See you Wednesday!
Saturday, February 4, 2012
Discussion for Computer Composition Lab
The Lab and pre-lab assignment are now available. As usual, a physical copy of your pre-lab assignment is due at the start of lab on February 8th.
Please post your questions and comments here.
Have a great weekend!
Friday, February 3, 2012
Discussion for Feb. 3
Today we covered many topics while covering the JFrameDemo class (go look at it again).
Topics for Discussion (reply for participation credit):
The new keyword was mentioned today. What is its purpose?
Another word that came up was null. What is null? What does it mean for something to be null? When might you get a NullPointerException?
We mentioned the 8 primitive types in Java. What are they?
Through out today's class the word reference popped up quite a bit. What is a reference? Why can't primitive types contain references?
In Java, we don't have to worry about managing our own memory. There is a special feature that walks around in the background like your mother cleaning up your messes. What is the name of this thing? When does it clean up your memory? How do you know an Object is ready to be cleaned up?
Pass by value and Pass by reference were also mentioned. What does it mean to be pass by value? What does it mean to be pass by reference?
Look at the following code Incrementor.java: http://pastebin.com/TPN5XDbF
Don't compile and run it. First write down what you think it will print out. Explain your answer.
Now compile and run it. Did it run the way you thought? Explain what is going on here.
Preparing for Monday
Review JFrameDemo.java and understand what it is doing. Read through some GUI tutorials in Java. A good place to start is here: http://docs.oracle.com/javase/tutorial/ui/index.html
Have a great weekend!
Topics for Discussion (reply for participation credit):
The new keyword was mentioned today. What is its purpose?
Another word that came up was null. What is null? What does it mean for something to be null? When might you get a NullPointerException?
We mentioned the 8 primitive types in Java. What are they?
Through out today's class the word reference popped up quite a bit. What is a reference? Why can't primitive types contain references?
In Java, we don't have to worry about managing our own memory. There is a special feature that walks around in the background like your mother cleaning up your messes. What is the name of this thing? When does it clean up your memory? How do you know an Object is ready to be cleaned up?
Pass by value and Pass by reference were also mentioned. What does it mean to be pass by value? What does it mean to be pass by reference?
Look at the following code Incrementor.java: http://pastebin.com/TPN5XDbF
Don't compile and run it. First write down what you think it will print out. Explain your answer.
Now compile and run it. Did it run the way you thought? Explain what is going on here.
Preparing for Monday
Review JFrameDemo.java and understand what it is doing. Read through some GUI tutorials in Java. A good place to start is here: http://docs.oracle.com/javase/tutorial/ui/index.html
Have a great weekend!
Wednesday, February 1, 2012
Discussion for Feb. 1
Today we touched on a large variety of topics. Let's see how much we know and can learn about them.
Discussion Topics (respond for participation credit):
We briefly talked about two related classes, InputStreamReader and BufferedReader. Google around a bit, look at the Java API and then describe what these classes do. What can they be used for? Are there other Reader classes?
Another word that came up today was Exception. Can you explain what an exception is? Why do these exist? How are they used? Why are these used?
At the end of the GuessingGame class we called the main method. There is a term for a method that calls itself, what is it? We said that when we do this "The Stack" grows. What does that mean? What is this magic "stack"? Read about it on wikipedia http://en.wikipedia.org/wiki/Call_stack. Then describe what it is doing in your own words.
We talked a little bit about how to efficiently solve the GuessingGame. The term Binary Search was mention. What is a Binary Search? What are its applications?
The keyword "final" was also mentioned today. What does final mean? Write a little example in java and share it via pastebin.com links.
Using methods to logically break up your code into manageable chunks is important. How do you know when you should break up your code? Why is this important?
Visibility and scope have also been tossed around quite a bit. What do these mean? What are we referring to when we say visibility? What are we referring to when we say scope?
Discussion Topics (respond for participation credit):
We briefly talked about two related classes, InputStreamReader and BufferedReader. Google around a bit, look at the Java API and then describe what these classes do. What can they be used for? Are there other Reader classes?
Another word that came up today was Exception. Can you explain what an exception is? Why do these exist? How are they used? Why are these used?
At the end of the GuessingGame class we called the main method. There is a term for a method that calls itself, what is it? We said that when we do this "The Stack" grows. What does that mean? What is this magic "stack"? Read about it on wikipedia http://en.wikipedia.org/wiki/Call_stack. Then describe what it is doing in your own words.
We talked a little bit about how to efficiently solve the GuessingGame. The term Binary Search was mention. What is a Binary Search? What are its applications?
The keyword "final" was also mentioned today. What does final mean? Write a little example in java and share it via pastebin.com links.
Using methods to logically break up your code into manageable chunks is important. How do you know when you should break up your code? Why is this important?
Visibility and scope have also been tossed around quite a bit. What do these mean? What are we referring to when we say visibility? What are we referring to when we say scope?
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