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Compiler (Java 2 Platform SE v1.4.2)
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java.lang</FONT>
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Class Compiler</H2>
<PRE>
<A HREF="../../java/lang/Object.html" title="class in java.lang">java.lang.Object</A>
<IMG SRC="../../resources/inherit.gif" ALT="extended by"><B>java.lang.Compiler</B>
</PRE>
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<DL>
<DT>public final class <B>Compiler</B><DT>extends <A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A></DL> <P>
The <code>Compiler</code> class is provided to support
Java-to-native-code compilers and related services. By design, the
<code>Compiler</code> class does nothing; it serves as a
placeholder for a JIT compiler implementation.
Compiler类被用来支持Java-本地代码的编译器和相关服务。设计中，Compiler不做任何事，只是充当JIT编译器实现中的占位符。
<p>
When the Java Virtual Machine first starts, it determines if the
system property <code>java.compiler</code> exists. (System
properties are accessible through <code>getProperty</code> and ,
a method defined by the <code>System</code> class.) If so, it is
assumed to be the name of a library (with a platform-dependent
exact location and type); the <code>loadLibrary</code> method in
class <code>System</code> is called to load that library. If this
loading succeeds, the function named
<code>java_lang_Compiler_start()</code> in that library is called.
当Java虚拟机第一次启动时，它先判断系统属性java.compiler是否存在（系统属性通过
System类的getProperty方法访问）。如果存在，它将被假定为一个库名（一个平台无关的确切路径和类型），调用System
的loadLibrary方法加载该库。如果成功加载，调用该库中的java_lang_Compiler_start()方法。
<p>
If no compiler is available, these methods do nothing.
如果没有可用的编译器，这些方法不做任何事。
<P> <P>
<DL>
<DT><B>Since:</B></DT>
<DD>JDK1.0</DD>
<DT><B>See Also:</B><DD><A HREF="../../java/lang/System.html#getProperty(java.lang.String)"><CODE>System.getProperty(java.lang.String)</CODE></A>,
<A HREF="../../java/lang/System.html#getProperty(java.lang.String, java.lang.String)"><CODE>System.getProperty(java.lang.String, java.lang.String)</CODE></A>,
<A HREF="../../java/lang/System.html#loadLibrary(java.lang.String)"><CODE>System.loadLibrary(java.lang.String)</CODE></A></DL>
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<B>Method Summary</B></FONT></TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/Compiler.html#command(java.lang.Object)">command</A></B>(<A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A> any)</CODE> <BR>
Examines the argument type and its fields and perform some documented
operation.检查参数类型及其域，并执行某些文档操作。</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<CODE>static boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/Compiler.html#compileClass(java.lang.Class)">compileClass</A></B>(<A HREF="../../java/lang/Class.html" title="class in java.lang">Class</A> clazz)</CODE> <BR>
Compiles the specified class.编译指定的类。</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/Compiler.html#compileClasses(java.lang.String)">compileClasses</A></B>(<A HREF="../../java/lang/String.html" title="class in java.lang">String</A> string)</CODE> <BR>
Compiles all classes whose name matches the specified string.编译所有名称和指定字符串相匹配的类。</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/Compiler.html#disable()">disable</A></B>()</CODE> <BR>
Cause the Compiler to cease operation.
使Compiler中止运行。</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/Compiler.html#enable()">enable</A></B>()</CODE> <BR>
Cause the Compiler to resume operation.
使Compiler恢复运行。</TD>
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<TD><B>Methods inherited from class java.lang.<A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../java/lang/Object.html#clone()">clone</A>, <A HREF="../../java/lang/Object.html#equals(java.lang.Object)">equals</A>, <A HREF="../../java/lang/Object.html#finalize()">finalize</A>, <A HREF="../../java/lang/Object.html#getClass()">getClass</A>, <A HREF="../../java/lang/Object.html#hashCode()">hashCode</A>, <A HREF="../../java/lang/Object.html#notify()">notify</A>, <A HREF="../../java/lang/Object.html#notifyAll()">notifyAll</A>, <A HREF="../../java/lang/Object.html#toString()">toString</A>, <A HREF="../../java/lang/Object.html#wait()">wait</A>, <A HREF="../../java/lang/Object.html#wait(long)">wait</A>, <A HREF="../../java/lang/Object.html#wait(long, int)">wait</A></CODE></TD>
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</TABLE> <A NAME="compileClass(java.lang.Class)"><!-- --></A><H3>
compileClass</H3>
<PRE>
public static boolean <B>compileClass</B>(<A HREF="../../java/lang/Class.html" title="class in java.lang">Class</A> clazz)</PRE>
<DL>
<DD>Compiles the specified class. 编译指定的类。
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>clazz</CODE> - a class. 类。
<DT><B>Returns:</B><DD><code>true</code> if the compilation succeeded;
<code>false</code> if the compilation failed or no compiler
is available. 如果编译成功，返回true，如果编译失败或者没有可用的编译器返回false。
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</A></CODE> - if <code>clazz</code> is
<code>null</code>. 如果clazz为null时抛出。</DL>
</DD>
</DL>
<HR> <A NAME="compileClasses(java.lang.String)"><!-- --></A><H3>
compileClasses</H3>
<PRE>
public static boolean <B>compileClasses</B>(<A HREF="../../java/lang/String.html" title="class in java.lang">String</A> string)</PRE>
<DL>
<DD>Compiles all classes whose name matches the specified string.
编译所有名称和指定字符串相匹配的类。
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>string</CODE> - the name of the classes to compile. 用来编译的类名称。
<DT><B>Returns:</B><DD><code>true</code> if the compilation succeeded;
<code>false</code> if the compilation failed or no compiler
is available. 如果编译成功，返回true，如果编译失败或者没有可用的编译器返回false。
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</A></CODE> - if <code>string</code> is
<code>null</code>. 如果string为null时抛出。</DL>
</DD>
</DL>
<HR> <A NAME="command(java.lang.Object)"><!-- --></A><H3>
command</H3>
<PRE>
public static <A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A> <B>command</B>(<A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A> any)</PRE>
<DL>
<DD>Examines the argument type and its fields and perform some documented
operation. No specific operations are required.
检查参数类型及其域，并执行某些文档操作。不需要指定操作。
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>any</CODE> - an argument. 参数。
<DT><B>Returns:</B><DD>a compiler-specific value, or <code>null</code> if no compiler
is available. 编译器指定值，如果没有可用的编译器，为null。
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</A></CODE> - if <code>any</code> is
<code>null</code>. 如果any为null时抛出。</DL>
</DD>
</DL>
<HR> <A NAME="enable()"><!-- --></A><H3>
enable</H3>
<PRE>
public static void <B>enable</B>()</PRE>
<DL>
<DD>Cause the Compiler to resume operation. 使Compiler恢复运行。
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR> <A NAME="disable()"><!-- --></A><H3>
disable</H3>
<PRE>
public static void <B>disable</B>()</PRE>
<DL>
<DD>Cause the Compiler to cease operation. 使Compiler中止运行。
<P>
<DD><DL>
</DL>
</DD>
</DL>
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