java.lang
Class Process
An instance of a subclass of
Process is created by the
Runtime.exec methods. Methods in
Process
provide a means to send input to a process, obtain the output from a
subprocess, destroy a subprocess, obtain the exit value from a
subprocess, and wait for a subprocess to complete.
This is dependent on the platform, and some processes (like native
windowing processes, 16-bit processes in Windows, or shell scripts) may
be limited in functionality. Because some platforms have limited buffers
between processes, you may need to provide input and read output to prevent
the process from blocking, or even deadlocking.
Even if all references to this object disapper, the process continues
to execute to completion. There are no guarantees that the
subprocess execute asynchronously or concurrently with the process which
owns this object.
Process()- Empty constructor does nothing.
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abstract void | destroy()- Kills the subprocess and all of its children forcibly.
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abstract int | exitValue()- When a process terminates there is associated with that termination
an exit value for the process to indicate why it terminated.
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abstract InputStream | getErrorStream()- Obtain the input stream that receives data from the subprocess.
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abstract InputStream | getInputStream()- Obtain the input stream that receives data from the subprocess.
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abstract OutputStream | getOutputStream()- Obtain the output stream that sends data to the subprocess.
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abstract int | waitFor()- The thread calling
waitFor will block until the subprocess
has terminated.
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clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
Process
public Process()
Empty constructor does nothing.
destroy
public abstract void destroy()
Kills the subprocess and all of its children forcibly.
exitValue
public abstract int exitValue()
When a process terminates there is associated with that termination
an exit value for the process to indicate why it terminated. A return
of 0 denotes normal process termination by convention.
- the exit value of the subprocess
getErrorStream
public abstract InputStream getErrorStream()
Obtain the input stream that receives data from the subprocess. This is
the STDERR of the subprocess. When implementing, you should probably
use a buffered stream.
- the input stream that pipes data from the process error output
getInputStream
public abstract InputStream getInputStream()
Obtain the input stream that receives data from the subprocess. This is
the STDOUT of the subprocess. When implementing, you should probably
use a buffered stream.
- the input stream that pipes data from the process output
getOutputStream
public abstract OutputStream getOutputStream()
Obtain the output stream that sends data to the subprocess. This is
the STDIN of the subprocess. When implementing, you should probably
use a buffered stream.
- the output stream that pipes to the process input
waitFor
public abstract int waitFor()
throws InterruptedException The thread calling waitFor will block until the subprocess
has terminated. If the process has already terminated then the method
immediately returns with the exit value of the subprocess.
- the subprocess exit value; 0 conventionally denotes success
Process.java - Represent spawned system process
Copyright (C) 1998, 1999, 2001, 2002, 2003, 2004, 2005
Free Software Foundation, Inc.
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