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Java s error-handling mechanism is one of its great strengths. Exception handling with try/ catch/finally is very robust and leads to very supportable code. Since one can easily add application-specific exception classes to support one s own work, this approach is also very extendable.
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INPUT AND OUTPUT Java programs read and write data by means of streams. A stream is a series of data elements that flows from some input device to the program, or from the program to some output device. The general approach to input and output (I/O) from a Java program is to: Open the stream While there is data to read or write read and process data, or write data } Close the stream The stream classes for I/O are grouped together in a Java package called java.io. A package is just a collection of related classes. One can create packages of one s own classes, but we will not be describing that in this brief introduction to the language. The reason to mention the package name here is that a programmer must import a package in order to take advantage of the classes within it. In order to use the stream classes we will soon discuss, your program must have a statement at the very beginning, even before the class statement, that says, import java.io.*; The asterisk means to import all the classes in the package. If the programmer wants only one of the classes, the programmer can substitute the class name for the asterisk. Usually one simply types the line as we have shown it. The stream classes in Java are divided into two great categories: Reader/Writer and InputStream/ OutputStream. If the class is in the Reader/Writer category, it is a stream for reading and writing character data letters, numbers, and symbols. If the class is in the InputStream/OutputStream category, it is a stream for reading and writing bytes raw data, 8 bits at a time. Students are sometimes confused thinking about the difference between character data and bytes. Are not bytes used to encode characters Yes they are. In fact, we could get along with just the InputStream/ OutputStream classes, and let programs be responsible for making sense of the data by converting the data to characters when that was appropriate. However, often data sources consist of character data, and it is very convenient to have I/O classes for that common situation. If the information exists in the form of characters, a Reader/Writer will interpret the information correctly and return a set of characters to the program. This saves the programmer having to write a tedious conversion that would otherwise be necessary frequently. If the information exists in some other form than characters, such as binary numbers in integer or floatingpoint format, as in an image file, then it will not make sense to interpret the bit patterns as characters. In that case, the programmer should use the InputStream/OutputStream classes, which will simply transfer the bytes. Then the program will be responsible for interpreting the bytes correctly. One other situation calls for the use of InputStream/OutputStream classes, too. That is when one does not care what the data represent. This would be the case, for example, when the task is to copy a file. The program doing the copying does not need to know what the content of the file means; it just needs to copy each byte to a new file. In that case, using the InputStream/OutputStream classes instead of the Reader/Writer classes makes sense, even if the file to be copied consists of characters, because the InputStream/OutputStream classes will be more efficient the step of translating bit patterns to characters will be skipped.
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