runtime.html

API資料大全

<DD>Runs the garbage collector.
 Calling this method suggests that the Java Virtual Machine expend 
 effort toward recycling unused objects in order to make the memory 
 they currently occupy available for quick reuse. When control 
 returns from the method call, the Java Virtual Machine has made 
 its best effort to recycle all discarded objects. 
 <p>
 The name <code>gc</code> stands for "garbage 
 collector". The Java Virtual Machine performs this recycling 
 process automatically as needed, in a separate thread, even if the 
 <code>gc</code> method is not invoked explicitly.
 <p>
 The method <A HREF="../../java/lang/System.html#gc()"><CODE>System.gc()</CODE></A> is hte conventional and convenient 
 means of invoking this method.</DL>
<HR>

<A NAME="runFinalization()"><!-- --></A><H3>
runFinalization</H3>
<PRE>
public void <B>runFinalization</B>()</PRE>
<DL>
<DD>Runs the finalization methods of any objects pending finalization.
 Calling this method suggests that the Java Virtual Machine expend 
 effort toward running the <code>finalize</code> methods of objects 
 that have been found to be discarded but whose <code>finalize</code> 
 methods have not yet been run. When control returns from the 
 method call, the Java Virtual Machine has made a best effort to 
 complete all outstanding finalizations. 
 <p>
 The Java Virtual Machine performs the finalization process 
 automatically as needed, in a separate thread, if the 
 <code>runFinalization</code> method is not invoked explicitly. 
 <p>
 The method <A HREF="../../java/lang/System.html#runFinalization()"><CODE>System.runFinalization()</CODE></A> is the conventional 
 and convenient means of invoking this method.<DD><DL>
<DT><B>See Also: </B><DD><A HREF="../../java/lang/Object.html#finalize()"><CODE>Object.finalize()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="traceInstructions(boolean)"><!-- --></A><H3>
traceInstructions</H3>
<PRE>
public void <B>traceInstructions</B>(boolean&nbsp;on)</PRE>
<DL>
<DD>Enables/Disables tracing of instructions.
 If the <code>boolean</code> argument is <code>true</code>, this 
 method suggests that the Java Virtual Machine emit debugging 
 information for each instruction in the Java Virtual Machine as it 
 is executed. The format of this information, and the file or other 
 output stream to which it is emitted, depends on the host environment. 
 The virtual machine may ignore this request if it does not support 
 this feature. The destination of the trace output is system 
 dependent. 
 <p>
 If the <code>boolean</code> argument is <code>false</code>, this 
 method causes the Java Virtual Machine to stop performing the 
 detailed instruction trace it is performing.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>on</CODE> - <code>true</code> to enable instruction tracing;
               <code>false</code> to disable this feature.</DL>
</DD>
</DL>
<HR>

<A NAME="traceMethodCalls(boolean)"><!-- --></A><H3>
traceMethodCalls</H3>
<PRE>
public void <B>traceMethodCalls</B>(boolean&nbsp;on)</PRE>
<DL>
<DD>Enables/Disables tracing of method calls.
 If the <code>boolean</code> argument is <code>true</code>, this 
 method suggests that the Java Virtual Machine emit debugging 
 information for each method in the Java Virtual Machine as it is 
 called. The format of this information, and the file or other output 
 stream to which it is emitted, depends on the host environment. The 
 virtual machine may ignore this request if it does not support 
 this feature.  
 <p>
 Calling this method with argument false suggests that the Java 
 Virtual Machine cease emitting per-call debugging information.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>on</CODE> - <code>true</code> to enable instruction tracing;
               <code>false</code> to disable this feature.</DL>
</DD>
</DL>
<HR>

<A NAME="load(java.lang.String)"><!-- --></A><H3>
load</H3>
<PRE>
public void <B>load</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;filename)</PRE>
<DL>
<DD>Loads the specified filename as a dynamic library. The filename 
 argument must be a complete pathname. 
 From <code>java_g</code> it will automagically insert "_g" before the
 ".so" (for example
 <code>Runtime.getRuntime().load("/home/avh/lib/libX11.so");</code>).
 <p>
 First, if there is a security manager, its <code>checkLink</code> 
 method is called with the <code>filename</code> as its argument. 
 This may result in a security exception. 
 <p>
 This is similar to the method <A HREF="../../java/lang/Runtime.html#loadLibrary(java.lang.String)"><CODE>loadLibrary(String)</CODE></A>, but it 
 accepts a general file name as an argument rathan than just a library 
 name, allowing any file of native code to be loaded.
 <p>
 The method <A HREF="../../java/lang/System.html#load(java.lang.String)"><CODE>System.load(String)</CODE></A> is the conventional and 
 convenient means of invoking this method.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>filename</CODE> - the file to load.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/lang/SecurityException.html">SecurityException</A></CODE> - if a security manager exists and its  
             <code>checkLink</code> method doesn't allow 
             loading of the specified dynamic library<DD><CODE><A HREF="../../java/lang/UnsatisfiedLinkError.html">UnsatisfiedLinkError</A></CODE> - if the file does not exist.<DT><B>See Also: </B><DD><A HREF="../../java/lang/Runtime.html#getRuntime()"><CODE>getRuntime()</CODE></A>, 
<A HREF="../../java/lang/SecurityException.html"><CODE>SecurityException</CODE></A>, 
<A HREF="../../java/lang/SecurityManager.html#checkLink(java.lang.String)"><CODE>SecurityManager.checkLink(java.lang.String)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="loadLibrary(java.lang.String)"><!-- --></A><H3>
loadLibrary</H3>
<PRE>
public void <B>loadLibrary</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;libname)</PRE>
<DL>
<DD>Loads the dynamic library with the specified library name. 
 A file containing native code is loaded from the local file system 
 from a place where library files are conventionally obtained. The 
 details of this process are implementation-dependent. The 
 mapping from a library name to a specific filename is done in a 
 system-specific manner. 
 <p>
 First, if there is a security manager, its <code>checkLink</code> 
 method is called with the <code>libname</code> as its argument. 
 This may result in a security exception. 
 <p>
 The method <A HREF="../../java/lang/System.html#loadLibrary(java.lang.String)"><CODE>System.loadLibrary(String)</CODE></A> is the conventional 
 and convenient means of invoking this method. If native
 methods are to be used in the implementation of a class, a standard 
 strategy is to put the native code in a library file (call it 
 <code>LibFile</code>) and then to put a static initializer:
 <blockquote><pre>
 static { System.loadLibrary("LibFile"); }
 </pre></blockquote>
 within the class declaration. When the class is loaded and 
 initialized, the necessary native code implementation for the native 
 methods will then be loaded as well. 
 <p>
 If this method is called more than once with the same library 
 name, the second and subsequent calls are ignored.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>libname</CODE> - the name of the library.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/lang/SecurityException.html">SecurityException</A></CODE> - if a security manager exists and its  
             <code>checkLink</code> method doesn't allow 
             loading of the specified dynamic library<DD><CODE><A HREF="../../java/lang/UnsatisfiedLinkError.html">UnsatisfiedLinkError</A></CODE> - if the library does not exist.<DT><B>See Also: </B><DD><A HREF="../../java/lang/SecurityException.html"><CODE>SecurityException</CODE></A>, 
<A HREF="../../java/lang/SecurityManager.html#checkLink(java.lang.String)"><CODE>SecurityManager.checkLink(java.lang.String)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getLocalizedInputStream(java.io.InputStream)"><!-- --></A><H3>
getLocalizedInputStream</H3>
<PRE>
public <A HREF="../../java/io/InputStream.html">InputStream</A> <B>getLocalizedInputStream</B>(<A HREF="../../java/io/InputStream.html">InputStream</A>&nbsp;in)</PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I>As of JDK&nbsp;1.1, the preferred way translate a byte
 stream in the local encoding into a character stream in Unicode is via
 the <code>InputStreamReader</code> and <code>BufferedReader</code>
 classes.</I>
<P>
<DD>Creates a localized version of an input stream. This method takes 
 an <code>InputStream</code> and returns an <code>InputStream</code> 
 equivalent to the argument in all respects except that it is 
 localized: as characters in the local character set are read from 
 the stream, they are automatically converted from the local 
 character set to Unicode. 
 <p>
 If the argument is already a localized stream, it may be returned 
 as the result.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>in</CODE> - InputStream to localize<DT><B>Returns:</B><DD>a localized input stream<DT><B>See Also: </B><DD><A HREF="../../java/io/InputStream.html"><CODE>InputStream</CODE></A>, 
<A HREF="../../java/io/BufferedReader.html#BufferedReader(java.io.Reader)"><CODE>BufferedReader.BufferedReader(java.io.Reader)</CODE></A>, 
<A HREF="../../java/io/InputStreamReader.html#InputStreamReader(java.io.InputStream)"><CODE>InputStreamReader.InputStreamReader(java.io.InputStream)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getLocalizedOutputStream(java.io.OutputStream)"><!-- --></A><H3>
getLocalizedOutputStream</H3>
<PRE>
public <A HREF="../../java/io/OutputStream.html">OutputStream</A> <B>getLocalizedOutputStream</B>(<A HREF="../../java/io/OutputStream.html">OutputStream</A>&nbsp;out)</PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I>As of JDK&nbsp;1.1, the preferred way to translate a
 Unicode character stream into a byte stream in the local encoding is via
 the <code>OutputStreamWriter</code>, <code>BufferedWriter</code>, and
 <code>PrintWriter</code> classes.</I>
<P>
<DD>Creates a localized version of an output stream. This method 
 takes an <code>OutputStream</code> and returns an 
 <code>OutputStream</code> equivalent to the argument in all respects 
 except that it is localized: as Unicode characters are written to 
 the stream, they are automatically converted to the local 
 character set. 
 <p>
 If the argument is already a localized stream, it may be returned 
 as the result.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>out</CODE> - OutputStream to localize<DT><B>Returns:</B><DD>a localized output stream<DT><B>See Also: </B><DD><A HREF="../../java/io/OutputStream.html"><CODE>OutputStream</CODE></A>, 
<A HREF="../../java/io/BufferedWriter.html#BufferedWriter(java.io.Writer)"><CODE>BufferedWriter.BufferedWriter(java.io.Writer)</CODE></A>, 
<A HREF="../../java/io/OutputStreamWriter.html#OutputStreamWriter(java.io.OutputStream)"><CODE>OutputStreamWriter.OutputStreamWriter(java.io.OutputStream)</CODE></A>, 
<A HREF="../../java/io/PrintWriter.html#PrintWriter(java.io.OutputStream)"><CODE>PrintWriter.PrintWriter(java.io.OutputStream)</CODE></A></DL>
</DD>
</DL>
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