java.lang
Class Process
java.lang.Object
|
+--java.lang.Process
public abstract class
Processextends
Object 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.
Since:Authors:- Brian Jones
- Tom Tromey <tromey@cygnus.com>
See Also:
Process
public Process()
Empty constructor does nothing.
destroy
public void destroy()
Kills the subprocess and all of its children forcibly.
exitValue
public 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.
Returns:
- the exit value of the subprocess
Throws:
getErrorStream
public 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.
Returns:
- the input stream that pipes data from the process error output
getInputStream
public 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.
Returns:
- the input stream that pipes data from the process output
getOutputStream
public 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.
Returns:
- the output stream that pipes to the process input
waitFor
public int waitFor()
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.
Returns:
- the subprocess exit value; 0 conventionally denotes success
Throws:
Process
is created by theRuntime.exec
methods. Methods inProcess
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.