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Class java.lang.Runtime 

java.lang.Object
   |
   +----java.lang.Runtime
public class Runtime
extends Object

Method Index

o exec(String)
Executes the system command specified in the parameter.
o exec(String, String[])
Executes the system command specified in the parameter.
o exec(String[])
Executes the system command specified by cmdarray[0] with arguments specified by the strings in the rest of the array.
o exec(String[], String[])
Executes the system command specified by cmdarray[0] with arguments specified by the strings in the rest of the array.
o exit(int)
Exits the virtual machine with an exit code.
o freeMemory()
Returns the number of free bytes in system memory.
o gc()
Runs the garbage collector.
o getLocalizedInputStream(InputStream)
Localize an input stream. Deprecated.
o getLocalizedOutputStream(OutputStream)
Localize an output stream. Deprecated.
o getRuntime()
Returns the runtime.
o load(String)
Loads a dynamic library, given a complete path name.
o loadLibrary(String)
Loads a dynamic library with the specified library name.
o runFinalization()
Runs the finalization methods of any objects pending finalization.
o runFinalizersOnExit(boolean)
Enable or disable finalization on exit; doing so specifies that the finalizers of all objects that have finalizers that have not yet been automatically invoked are to be run before the Java runtime exits.
o totalMemory()
Returns the total number of bytes in system memory.
o traceInstructions(boolean)
Enables/Disables tracing of instructions.
o traceMethodCalls(boolean)
Enables/Disables tracing of method calls.

Methods

o getRuntime 
  public static Runtime getRuntime()
Returns the runtime.

o exit 
  public void exit(int status)
Exits the virtual machine with an exit code. This method does not return, use with caution.

Parameters:
status - exit status, 0 if successful, other values indicate various error types.
o runFinalizersOnExit 
  public static void runFinalizersOnExit(boolean value)
Enable or disable finalization on exit; doing so specifies that the finalizers of all objects that have finalizers that have not yet been automatically invoked are to be run before the Java runtime exits. By default, finalization on exit is disabled. An invocation of the runFinalizersOnExit method is permitted only if the caller is allowed to exit, and is otherwise rejected by the security manager.

See Also:
gc, exit
o exec 
  public Process exec(String command) throws IOException
Executes the system command specified in the parameter. Returns a Process which has methods for optaining the stdin, stdout, and stderr of the subprocess. This method fails if executed by untrusted code.

Parameters:
command - a specified system command
Returns:
an instance of class Process
o exec 
  public Process exec(String command,
                      String envp[]) throws IOException
Executes the system command specified in the parameter. Returns a Process which has methods for optaining the stdin, stdout, and stderr of the subprocess. This method fails if executed by untrusted code.

Parameters:
command - a specified system command
Returns:
an instance of class Process
o exec 
  public Process exec(String cmdarray[]) throws IOException
Executes the system command specified by cmdarray[0] with arguments specified by the strings in the rest of the array. Returns a Process which has methods for optaining the stdin, stdout, and stderr of the subprocess. This method fails if executed by untrusted code.

Parameters:
an - array containing the command to call and its arguments
envp - array containing environment in format name=value
Returns:
an instance of class Process
o exec 
  public Process exec(String cmdarray[],
                      String envp[]) throws IOException
Executes the system command specified by cmdarray[0] with arguments specified by the strings in the rest of the array. Returns a Process which has methods for optaining the stdin, stdout, and stderr of the subprocess. This method fails if executed by untrusted code.

Parameters:
an - array containing the command to call and its arguments
envp - array containing environment in format name=value
Returns:
an instance of class Process
o freeMemory 
  public long freeMemory()
Returns the number of free bytes in system memory. This number is not always accurate because it is just an estimation of the available memory. More memory may be freed by calling System.gc() .

o totalMemory 
  public long totalMemory()
Returns the total number of bytes in system memory.

o gc 
  public void gc()
Runs the garbage collector.

o runFinalization 
  public void runFinalization()
Runs the finalization methods of any objects pending finalization. Usually you will not need to call this method since finalization methods will be called asynchronously by the finalization thread. However, under some circumstances (like running out of a finalized resource) it can be useful to run finalization methods synchronously.

o traceInstructions 
  public void traceInstructions(boolean on)
Enables/Disables tracing of instructions.

Parameters:
on - start tracing if true
o traceMethodCalls 
  public void traceMethodCalls(boolean on)
Enables/Disables tracing of method calls.

Parameters:
on - start tracing if true
o load 
  public synchronized void load(String filename)
Loads a dynamic library, given a complete path name. If you use this from java_g it will automagically insert "_g" before the ".so". Example: Runtime.getRuntime().load("/home/avh/lib/libX11.so");

Parameters:
filename - the file to load
Throws: UnsatisfiedLinkError
If the file does not exist.
See Also:
getRuntime
o loadLibrary 
  public synchronized void loadLibrary(String libname)
Loads a dynamic library with the specified library name. The call to LoadLibrary() should be made in the static initializer of the first class that is loaded. Linking in the same library more than once is ignored.

Parameters:
libname - the name of the library
Throws: UnsatisfiedLinkError
If the library does not exist.
o getLocalizedInputStream 
  public InputStream getLocalizedInputStream(InputStream in)
Note: getLocalizedInputStream() is deprecated. As of JDK version 1.1, the preferred way translate from the local encoding to Unicode is via the new InputStreamReader and BufferedReader classes.

Localize an input stream. A localized input stream will automatically translate the input from the local format to Unicode.

See Also:
InputStreamReader, BufferedReader
o getLocalizedOutputStream 
  public OutputStream getLocalizedOutputStream(OutputStream out)
Note: getLocalizedOutputStream() is deprecated. As of JDK version 1.1, the preferred way to translate from Unicode into the local encoding is via the new OutputStreamWriter, BufferedWriter, and PrintWriter classes.

Localize an output stream. A localized output stream will automatically translate the output from Unicode to the local format.

See Also:
OutputStreamWriter, BufferedWriter, PrintWriter 
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