文件列表:

Lecture 01 - Annotated\.classpath (232, 2009-01-06)
Lecture 01 - Annotated\.project (386, 2009-01-06)
Lecture 01 - Annotated\bin (0, 2011-09-26)
Lecture 01 - Annotated\bin\CallByValueChange.class (1015, 2011-09-26)
Lecture 01 - Annotated\bin\CallByValueExample.class (644, 2011-09-26)
Lecture 01 - Annotated\bin\CallByValueExample2.class (1038, 2011-09-26)
Lecture 01 - Annotated\bin\CopyingExamples.class (1032, 2011-09-26)
Lecture 01 - Annotated\bin\Hello.class (504, 2011-09-26)
Lecture 01 - Annotated\bin\MultiDimensionalExample.class (1281, 2011-09-26)
Lecture 01 - Annotated\bin\MyPoint.class (937, 2011-09-26)
Lecture 01 - Annotated\bin\StringComparison.class (992, 2011-09-26)
Lecture 01 - Annotated\bin\Student.class (1735, 2011-09-26)
Lecture 01 - Annotated\src (0, 2011-09-26)
Lecture 01 - Annotated\src\CallByValueChange.java (277, 2009-09-21)
Lecture 01 - Annotated\src\CallByValueExample.java (205, 2009-01-06)
Lecture 01 - Annotated\src\CallByValueExample2.java (283, 2009-01-06)
Lecture 01 - Annotated\src\CopyingExamples.java (404, 2010-01-05)
Lecture 01 - Annotated\src\Hello.java (108, 2010-01-05)
Lecture 01 - Annotated\src\MultiDimensionalExample.java (450, 2009-09-21)
Lecture 01 - Annotated\src\MyPoint.java (369, 2009-01-06)
Lecture 01 - Annotated\src\StringComparison.java (277, 2009-01-06)
Lecture 01 - Annotated\src\Student.java (4729, 2008-01-10)

Hello.java -- this very simple program demonstrates some key principles of programming regular (non-CS106) Java - the function/method that will be executed first is: public static void main(String[] args) - to print information use: System.out.println("Hello"); or System.err.println("Hello"); I generally use System.out if what I'm printing represents the true output of the program and System.err if I'm printing debugging information or other status reports appropriate for administrators, but not for most end-users ---- The following examples demonstrate Call by Reference vs. Call By Value CallByValueExample.java -- in this example incrementing a parameter does nothing, parameters are passed by value and so only the value of x is passed into the method increment CallByValueExample2.java -- in this case we are passing in an object, which is a reference type. While we can't change what the parameter refers to, we can change the values inside the object which is being referred to CallByValueChange.java -- This example shows that we can't really change the object itself to refer to a different object, this is what a true call-by-reference would allow. ---- MyPoint.java -- this example provides several key points - MyPoint includes a copy constructor, which can be used to create new objects with the same values as an existing object. - The equals method compares the values of an object rather than the object itself. (We'll see a fancier, better version of equals once we've gone over inheritance). CopyingExamples.java -- this illustrates the difference between creating a clone with MyPoint's copy constructor vs. simply using assignment with = ---- StringComparison.java - Two strings with the same character are not == but they are .equals. Student.java - this example illustrates a wide range of points, see the comments inside the file for further information MultiDimensionalExample.java - this example (inspired by an official Sun example) shows how Java arrays of arrays work. Notice the different arrays within cartoons have different lengths.

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