HEAD FIRST BOOKS PDF
Head First SQL is at the top of my stack. Heck, even the PDF I have for review is tattered and torn.” — Bill Sawyer, ATG Curriculum Manager, Oracle. “This book's . “Where other books start with theory and progress to examples, Head First Python jumps right in with code and explains the theory as you read along. This is a. Praise for other Head First books co-authored by Kathy and Bert. This PDF is made available for personal use only during the relevant subscription term.
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A Dog example 4.
Methods Use Instance Variables: How Objects Behave Remember: The size affects the bark You can send things to a method You can get things back from a method You can send more than one thing to a method Calling a two-parameter method, and sending it two arguments You can pass variables into a method, as long as the variable type matches the parameter type Java is pass-by-value.
That means pass-by-copy Cool things you can do with parameters and return types Encapsulation Do it or risk humiliation and ridicule Hide the data Encapsulating the GoodDog class How do objects in an array behave?
Declaring and initializing instance variables The difference between instance and local variables Comparing variables primitives or references 5. Writing a Program: A bug?
A different game interaction More about for loops Regular non-enhanced for loops Trips through a loop Difference between for and while The enhanced for loop Casting primitives 6. Using the Java Library In our last chapter, we left you with the cliff-hanger. How do we fix it?
Inheritance and Polymorphism: Understanding Inheritance An inheritance example: Which methods should we override? Looking for more inheritance opportunities Which method is called? Who gets the Porsche, who gets the porcelain? When designing with inheritance, are you using or abusing?
So what does all this inheritance really buy you?
Head First C#, 3rd Edition
Inheritance lets you guarantee that all classes grouped under a certain supertype have all the methods that the supertype has. Interfaces and Abstract Classes: Serious Polymorphism Did we forget about something when we designed this?
Why not make a class generic enough to take anything?
Using polymorphic references of type Object has a price Making and Implementing the Pet interface 9. Constructors and Garbage Collection: If local variables live on the stack, where do instance variables live? How do you invoke a superclass constructor? Can the child exist before the parents? Superclass constructors with arguments Invoking one overloaded constructor from another Now we know how an object is born, but how long does an object live?
What about reference variables? Numbers and Statics: Static variable: Math methods Wrapping a primitive Before Java 5.
Wrappers have static utility methods too! And now in reverse So much for numbers, what about dates? Exception Handling: I failed. Ducking by declaring only delays the inevitable Getting back to our music code Using command-line args to experiment with sounds Getting GUI: Getting a user event Listeners, Sources, and Events Getting back to graphics We can paint graphics.
But can we paint graphics when we get an event? GUI layouts: How do you get action events for two different buttons, when each button needs to do something different? Inner class to the rescue!
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Using Swing: Different layout managers have different policies The Big Three layout managers: What needs to be saved? If you want your class to be serializable, implement Serializable Deserialization: Networking and Threads: Every Thread needs a job to do.
A method to put on the new thread stack To make a job for your thread, implement the Runnable interface The Thread Scheduler Putting a thread to sleep Using sleep to make our program more predictable Making and starting two threads What will happen? Um, yes.
Head First Books
Make the increment method atomic. Synchronize it! Collections and Generics: ArrayList is not the only collection You could use a TreeSet Or you could use the Collections. The Song class needs to implement Comparable The new, improved, comparable Song class We can sort the list, but The sorting all works, but now we have duplicates
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