Skipping Bytes

The skip( ) method jumps over a certain number of bytes in the input:

public long skip(long bytesToSkip) throws IOException

The argument to skip( ) is the number of bytes to skip. The return value is the number of bytes actually skipped, which may be less than bytesToSkip. -1 is returned if the end of stream is encountered. Both the argument and return value are longs, allowing skip( ) to handle extremely long input streams. Skipping is often faster than reading and discarding the data you don't want. For example, when an input stream is attached to a file, skipping bytes just requires that the position in the file be changed, whereas reading involves copying bytes from the disk into memory. For example, to skip the next 80 bytes of the input stream in:

try {
 long bytesSkipped = 0;
 long bytesToSkip = 80;
 while (bytesSkipped < bytesToSkip) {
 long n = in.skip(bytesToSkip - bytesSkipped);
 if (n == -1) break;
 bytesSkipped += n;
 }
}
catch (IOException ex) {
 System.err.println(ex);
}


Basic I/O

Introducing I/O

Output Streams

Input Streams

Data Sources

File Streams

Network Streams

Filter Streams

Filter Streams

Print Streams

Data Streams

Streams in Memory

Compressing Streams

JAR Archives

Cryptographic Streams

Object Serialization

New I/O

Buffers

Channels

Nonblocking I/O

The File System

Working with Files

File Dialogs and Choosers

Text

Character Sets and Unicode

Readers and Writers

Formatted I/O with java.text

Devices

The Java Communications API

USB

The J2ME Generic Connection Framework

Bluetooth

Character Sets

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Java I/O
Java I/O
ISBN: 0596527500
EAN: 2147483647
Year: 2004
Pages: 244
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