Files in java
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The document discusses different types of streams in Java including file, byte, character, and standard streams. File streams allow reading and writing of files and include classes like FileInputStream and FileOutputStream for bytes and FileReader and FileWriter for characters. Byte streams handle 8-bit bytes while character streams handle 16-bit Unicode. Standard streams in Java are System.in for input, System.out for standard output, and System.err for errors. Sample code is provided to write to and read from files.
Files in java
- 1. File ● A collection of data or information that has a name, called the filename. ● To access File in java, the package java.io.File must be imported. ● There are many other File based classes in the java.io package which has its own purpose
- 2. The Stream Classes The basic stream classes in java are ● Byte stream classes ● Character stream classes ● Standard stream classes
- 3. Byte Stream classes ● Java byte streams are used to perform input and output of 8-bit bytes. ● The most frequently used byte stream classes are – FileInputStream and – FileOutputStream.
- 4. Character stream classes ● Java Byte streams are used to perform input and output of 8-bit bytes, where as Java Character streams are used to perform input and output for 16-bit unicode. ● The most frequently used character stream classes are – FileReader and – FileWriter.
- 5. Standard Stream Java provides following three standard streams ● Standard Input: This is used to feed the data to user's program and usually a keyboard is used as standard input stream and represented as System.in. ● Standard Output: This is used to output the data produced by the user's program and usually a computer screen is used to standard output stream and represented as System.out. ● Standard Error: This is used to output the error data produced by the user's program and usually a computer screen is used to standard error stream and represented as System.err.
- 6. Sample program to write into file
- 7. Sample program to read from file
- 8. Sample output for read from file