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The practice I have seen used creates the DataInputStream within the try block, and so it is out of scope by the time either the catch or finally clause executes, meaning a comipler error will result...

When reading from a DataInputSteam, it is common practice to read until an EOFException is thrown.

Apparently the DataInputSteam object is lost after the try block is exited and the catch clause...

I would very much like to know how to get low-level control of a physical device, such as the CDROM drive. For example, how can I open and close the tray under program control?

Thanks for your reply cjard. Please, where is your tutorial located?

I was hoping that there was some tool that would "build" an EXE by compiling and linking together just the code needed from...

So, are you saying that there is some command-line switch that will cause java.exe to take java class files as input and generate a stand-alone .EXE file as its output?

cjard, I think your countPairs() method double counts some pairs (which is fine if that is what you want!).

For example, if a hand has three 5's in it, there will be at least 3 pairs reported...

Does Sun (or someone else) provide a Java compiler that generates an executable (.EXE) for a PC? If so, where can it be found?

I can see that it may make a difference if there are GUI components...

I opened a disk file as both an object input stream and an object output stream, wrote to it, then immediately read from it, and it seems to work(!), which is not what I expected.

For starters, I...

Thanks for you reply cjard. However, I am aware of the issues you brought up.

Since I wasn't able to provoke the lose of data phenomena by not closing my file, I got to wondering if Java...

In other languages I have learned that it is imperative that open files must be closed, or risk losing data written to them.

I have tried a few experiments in Java, writing a bit of data but not...

Hi tszhim.

The problem is that computers use binary but we use decimal. There are many fractions that have a nice, terminating representation in decimal that can only be respresented in binary...

Thanks khp!

I have done some further investigation and apparently the 4 bytes after the header are a serial number. My understanding is that a serial number is written with every object written...

I created a binary data file using the following sequence:



ObjectOutputStream outStream = new ObjectOutputStream(
new...

Yep, you are right magus. So, it has to be that only String literals are checked for equality, so that only one copy is made. I wonder what that is called; maybe something like "String literal...

The following program compares two different string objects using the == operator and yet it outputs "true":



public class StringEquals
{
String composer = "Telemann";

public...

hi OSR,
I use jGRASP and do like it, but can't offer any comparison to other Java IDE's. FWIW, the author's are responsive to questions and comments, which is always a big plus! New releases have...

I have a class Employee with a method named getSalary().

I also have a class Manager that extends Employee with a getSalary() method that overrides the one in Employee.

When I say:


...

Uggg - Good catch on the reference Barancle.

However, I really don't like saying that private members are not inherited. As delorde suggests, it muddys the discussion (the variable totalMoves...

This is essentially a question about vocabulary.

I have a Java textbook that states that "the visibility modifiers determine whether a variable or method is inherited into a subclass".
...

Thanks very much for the link Barancle! Yes, I am very much interested in the math underlying computing. As it turns out, I have a degree in Mathematics, and teach math, including Statistics and...

It turns out that the proof that Knuth's algorithm will generate each of the 52! permutations with equal probability isn't too hard. The algorithm is:



for (i = 52; i > 1; i--)
{
c =...

Banancle, you offer a very nice treatment! Thank you very much for your efforts here.

I did a simulaton of the 2 algorithms and obtained the same results, but of course your analysis is much more...

dlorde, I really wasn't intending to challenge Knuth, sorry. I really am only searching for understanding, doing the best I can.

Part of the motivation for my query is that I actually did work up...

I have an array of Card objects, and want to "shuffle" it. Knuth (volume 2) suggests something like:


for (i = 51; i > 0; i--)
{
j = i*Math.random(); // select index at random

// swap...

Thank you for your reply cjard; thoughtful, candid and helpful as always. However, I have to take exception to your comment that



On my planet simply commanding coders not to write buggy...