system.html

API資料大全

<CODE>static&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/System.html#runFinalizersOnExit(boolean)">runFinalizersOnExit</A></B>(boolean&nbsp;value)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;<I>This method is inherently unsafe.  It may result in
 	    finalizers being called on live objects while other threads are
      concurrently manipulating those objects, resulting in erratic
	    behavior or deadlock.</I></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/System.html#setErr(java.io.PrintStream)">setErr</A></B>(<A HREF="../../java/io/PrintStream.html">PrintStream</A>&nbsp;err)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reassigns the "standard" error output stream.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/System.html#setIn(java.io.InputStream)">setIn</A></B>(<A HREF="../../java/io/InputStream.html">InputStream</A>&nbsp;in)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reassigns the "standard" input stream.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/System.html#setOut(java.io.PrintStream)">setOut</A></B>(<A HREF="../../java/io/PrintStream.html">PrintStream</A>&nbsp;out)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reassigns the "standard" output stream.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/System.html#setProperties(java.util.Properties)">setProperties</A></B>(<A HREF="../../java/util/Properties.html">Properties</A>&nbsp;props)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sets the system properties to the <code>Properties</code> 
 argument.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;<A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/System.html#setProperty(java.lang.String, java.lang.String)">setProperty</A></B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;key,
            <A HREF="../../java/lang/String.html">String</A>&nbsp;value)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sets the system property indicated by the specified key.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/System.html#setSecurityManager(java.lang.SecurityManager)">setSecurityManager</A></B>(<A HREF="../../java/lang/SecurityManager.html">SecurityManager</A>&nbsp;s)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sets the System security.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
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<TD><B>Methods inherited from class java.lang.<A HREF="../../java/lang/Object.html">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>
</TR>
</TABLE>
&nbsp;
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<!-- ============ FIELD DETAIL =========== -->

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<A NAME="in"><!-- --></A><H3>
in</H3>
<PRE>
public static final <A HREF="../../java/io/InputStream.html">InputStream</A> <B>in</B></PRE>
<DL>
<DD>The "standard" input stream. This stream is already 
 open and ready to supply input data. Typically this stream 
 corresponds to keyboard input or another input source specified by 
 the host environment or user.</DL>
<HR>

<A NAME="out"><!-- --></A><H3>
out</H3>
<PRE>
public static final <A HREF="../../java/io/PrintStream.html">PrintStream</A> <B>out</B></PRE>
<DL>
<DD>The "standard" output stream. This stream is already 
 open and ready to accept output data. Typically this stream 
 corresponds to display output or another output destination 
 specified by the host environment or user. 
 <p>
 For simple stand-alone Java applications, a typical way to write 
 a line of output data is: 
 <blockquote><pre>
     System.out.println(data)
 </pre></blockquote>
 <p>
 See the <code>println</code> methods in class <code>PrintStream</code>.<DD><DL>
<DT><B>See Also: </B><DD><A HREF="../../java/io/PrintStream.html#println()"><CODE>PrintStream.println()</CODE></A>, 
<A HREF="../../java/io/PrintStream.html#println(boolean)"><CODE>PrintStream.println(boolean)</CODE></A>, 
<A HREF="../../java/io/PrintStream.html#println(char)"><CODE>PrintStream.println(char)</CODE></A>, 
<A HREF="../../java/io/PrintStream.html#println(char[])"><CODE>PrintStream.println(char[])</CODE></A>, 
<A HREF="../../java/io/PrintStream.html#println(double)"><CODE>PrintStream.println(double)</CODE></A>, 
<A HREF="../../java/io/PrintStream.html#println(float)"><CODE>PrintStream.println(float)</CODE></A>, 
<A HREF="../../java/io/PrintStream.html#println(int)"><CODE>PrintStream.println(int)</CODE></A>, 
<A HREF="../../java/io/PrintStream.html#println(long)"><CODE>PrintStream.println(long)</CODE></A>, 
<A HREF="../../java/io/PrintStream.html#println(java.lang.Object)"><CODE>PrintStream.println(java.lang.Object)</CODE></A>, 
<A HREF="../../java/io/PrintStream.html#println(java.lang.String)"><CODE>PrintStream.println(java.lang.String)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="err"><!-- --></A><H3>
err</H3>
<PRE>
public static final <A HREF="../../java/io/PrintStream.html">PrintStream</A> <B>err</B></PRE>
<DL>
<DD>The "standard" error output stream. This stream is already 
 open and ready to accept output data. 
 <p>
 Typically this stream corresponds to display output or another 
 output destination specified by the host environment or user. By 
 convention, this output stream is used to display error messages 
 or other information that should come to the immediate attention 
 of a user even if the principal output stream, the value of the 
 variable <code>out</code>, has been redirected to a file or other 
 destination that is typically not continuously monitored.</DL>

<!-- ========= CONSTRUCTOR DETAIL ======== -->


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<A NAME="setIn(java.io.InputStream)"><!-- --></A><H3>
setIn</H3>
<PRE>
public static void <B>setIn</B>(<A HREF="../../java/io/InputStream.html">InputStream</A>&nbsp;in)</PRE>
<DL>
<DD>Reassigns the "standard" input stream.
 
 <p>First, if there is a security manager, its <code>checkPermission</code> 
 method is called with a <code>RuntimePermission("setIO")</code> permission
  to see if it's ok to reassign the "standard" input stream. 
 <p><DD><DL>
<DT><B>Parameters:</B><DD><CODE>in</CODE> - the new standard input stream.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/lang/SecurityException.html">SecurityException</A></CODE> - if a security manager exists and its 
        <code>checkPermission</code> method doesn't allow 
        reassigning of the standard input stream.<DT><B>Since: </B><DD>JDK1.1</DD>
<DT><B>See Also: </B><DD><A HREF="../../java/lang/SecurityManager.html#checkPermission(java.security.Permission)"><CODE>SecurityManager.checkPermission(java.security.Permission)</CODE></A>, 
<A HREF="../../java/lang/RuntimePermission.html"><CODE>RuntimePermission</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="setOut(java.io.PrintStream)"><!-- --></A><H3>
setOut</H3>
<PRE>
public static void <B>setOut</B>(<A HREF="../../java/io/PrintStream.html">PrintStream</A>&nbsp;out)</PRE>
<DL>
<DD>Reassigns the "standard" output stream.

 <p>First, if there is a security manager, its <code>checkPermission</code> 
 method is called with a <code>RuntimePermission("setIO")</code> permission
  to see if it's ok to reassign the "standard" output stream.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>out</CODE> - the new standard output stream<DT><B>Throws:</B><DD><CODE><A HREF="../../java/lang/SecurityException.html">SecurityException</A></CODE> - if a security manager exists and its 
        <code>checkPermission</code> method doesn't allow 
        reassigning of the standard output stream.<DT><B>Since: </B><DD>JDK1.1</DD>
<DT><B>See Also: </B><DD><A HREF="../../java/lang/SecurityManager.html#checkPermission(java.security.Permission)"><CODE>SecurityManager.checkPermission(java.security.Permission)</CODE></A>, 
<A HREF="../../java/lang/RuntimePermission.html"><CODE>RuntimePermission</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="setErr(java.io.PrintStream)"><!-- --></A><H3>
setErr</H3>
<PRE>
public static void <B>setErr</B>(<A HREF="../../java/io/PrintStream.html">PrintStream</A>&nbsp;err)</PRE>
<DL>
<DD>Reassigns the "standard" error output stream.

 <p>First, if there is a security manager, its <code>checkPermission</code> 
 method is called with a <code>RuntimePermission("setIO")</code> permission
  to see if it's ok to reassign the "standard" error output stream.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>err</CODE> - the new standard error output stream.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/lang/SecurityException.html">SecurityException</A></CODE> - if a security manager exists and its 
        <code>checkPermission</code> method doesn't allow 
        reassigning of the standard error output stream.<DT><B>Since: </B><DD>JDK1.1</DD>
<DT><B>See Also: </B><DD><A HREF="../../java/lang/SecurityManager.html#checkPermission(java.security.Permission)"><CODE>SecurityManager.checkPermission(java.security.Permission)</CODE></A>, 
<A HREF="../../java/lang/RuntimePermission.html"><CODE>RuntimePermission</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="setSecurityManager(java.lang.SecurityManager)"><!-- --></A><H3>
setSecurityManager</H3>
<PRE>
public static void <B>setSecurityManager</B>(<A HREF="../../java/lang/SecurityManager.html">SecurityManager</A>&nbsp;s)</PRE>
<DL>
<DD>Sets the System security.

 <p> If there is a security manager already installed, this method first
 calls the security manager's <code>checkPermission</code> method
 with a <code>RuntimePermission("setSecurityManager")</code>
 permission to ensure it's ok to replace the existing
 security manager.
 This may result in throwing a <code>SecurityException</code>.

 <p> Otherwise, the argument is established as the current 
 security manager. If the argument is <code>null</code> and no 
 security manager has been established, then no action is taken and 
 the method simply returns.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>s</CODE> - the security manager.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/lang/SecurityException.html">SecurityException</A></CODE> - if the security manager has already
             been set and its <code>checkPermission</code> method
             doesn't allow it to be replaced.<DT><B>See Also: </B><DD><A HREF="../../java/lang/System.html#getSecurityManager()"><CODE>getSecurityManager()</CODE></A>, 
<A HREF="../../java/lang/SecurityManager.html#checkPermission(java.security.Permission)"><CODE>SecurityManager.checkPermission(java.security.Permission)</CODE></A>, 
<A HREF="../../java/lang/RuntimePermission.html"><CODE>RuntimePermission</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getSecurityManager()"><!-- --></A><H3>
getSecurityManager</H3>
<PRE>
public static <A HREF="../../java/lang/SecurityManager.html">SecurityManager</A> <B>getSecurityManager</B>()</PRE>
<DL>
<DD>Gets the system security interface.<DD><DL>
<DT><B>Returns:</B><DD>if a security manager has already been established for the
          current application, then that security manager is returned;
          otherwise, <code>null</code> is returned.<DT><B>See Also: </B><DD><A HREF="../../java/lang/System.html#setSecurityManager(java.lang.SecurityManager)"><CODE>setSecurityManager(java.lang.SecurityManager)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="currentTimeMillis()"><!-- --></A><H3>
currentTimeMillis</H3>
<PRE>
public static long <B>currentTimeMillis</B>()</PRE>
<DL>
<DD>Returns the current time in milliseconds.
 <p>
 See the description of the class <code>Date</code> for a discussion 
 of slight discrepancies that may arise between "computer 
 time" and coordinated universal time (UTC).<DD><DL>
<DT><B>Returns:</B><DD>the difference, measured in milliseconds, between the current
          time and midnight, January 1, 1970 UTC.<DT><B>See Also: </B><DD><A HREF="../../java/util/Date.html"><CODE>Date</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="arraycopy(java.lang.Object, int, java.lang.Object, int, int)"><!-- --></A><H3>
arraycopy</H3>
<PRE>