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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Thu Apr 27 23:31:42 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Package java.lang</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Package</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <FONT CLASS="NavBarFont1">Class</FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-use.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java<sup><font size=-2>TM</font></sup> 2 Platform<br>Std. Ed. v1.3</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../java/io/package-summary.html"><B>PREV PACKAGE</B></A> <A HREF="../../java/lang/ref/package-summary.html"><B>NEXT PACKAGE</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="package-summary.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><H2>Package java.lang</H2>Provides classes that are fundamental to the design of the Javaprogramming language.<P><B>See: </B><BR> <A HREF="#package_description"><B>Description</B></A><P><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Interface Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Cloneable.html"><I>Cloneable</I></A></B></TD><TD>A class implements the <code>Cloneable</code> interface to indicate to the <A HREF="../../java/lang/Object.html#clone()"><CODE>Object.clone()</CODE></A> method that it is legal for that method to make a field-for-field copy of instances of that class.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Comparable.html"><I>Comparable</I></A></B></TD><TD>This interface imposes a total ordering on the objects of each class that implements it.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Runnable.html"><I>Runnable</I></A></B></TD><TD>The <code>Runnable</code> interface should be implemented by any class whose instances are intended to be executed by a thread.</TD></TR></TABLE> <P><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Class Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Boolean.html">Boolean</A></B></TD><TD>The Boolean class wraps a value of the primitive type <code>boolean</code> in an object.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Byte.html">Byte</A></B></TD><TD>The Byte class is the standard wrapper for byte values.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Character.html">Character</A></B></TD><TD>The Character class wraps a value of the primitive type <code>char</code> in an object.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Character.Subset.html">Character.Subset</A></B></TD><TD>Instances of this class represent particular subsets of the Unicode character set.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Character.UnicodeBlock.html">Character.UnicodeBlock</A></B></TD><TD>A family of character subsets representing the character blocks defined by the Unicode 2.0 specification.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Class.html">Class</A></B></TD><TD>Instances of the class <code>Class</code> represent classes and interfaces in a running Java application.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ClassLoader.html">ClassLoader</A></B></TD><TD>The class <code>ClassLoader</code> is an abstract class.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Compiler.html">Compiler</A></B></TD><TD>The <code>Compiler</code> class is provided to support Java-to-native-code compilers and related services.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Double.html">Double</A></B></TD><TD>The Double class wraps a value of the primitive type <code>double</code> in an object.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Float.html">Float</A></B></TD><TD>The Float class wraps a value of primitive type <code>float</code> in an object.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="InheritableThreadLocal.html">InheritableThreadLocal</A></B></TD><TD>This class extends ThreadLocal to provide inheritance of values from parent Thread to child Thread: when a child thread is created, the child receives initial values for all InheritableThreadLocals for which the parent has values.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Integer.html">Integer</A></B></TD><TD>The Integer class wraps a value of the primitive type <code>int</code> in an object.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Long.html">Long</A></B></TD><TD>The Long class wraps a value of the primitive type <code>long</code> in an object.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Math.html">Math</A></B></TD><TD>The class <code>Math</code> contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Number.html">Number</A></B></TD><TD>The abstract class <code>Number</code> is the superclass of classes <code>Byte</code>, <code>Double</code>, <code>Float</code>, <code>Integer</code>, <code>Long</code>, and <code>Short</code>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Object.html">Object</A></B></TD><TD>Class <code>Object</code> is the root of the class hierarchy.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Package.html">Package</A></B></TD><TD><code>Package</code> objects contain version information about the implementation and specification of a Java package.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Process.html">Process</A></B></TD><TD>The <code>Runtime.exec</code> methods create a native process and return an instance of a subclass of <code>Process</code> that can be used to control the process and obtain information about it.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Runtime.html">Runtime</A></B></TD><TD>Every Java application has a single instance of class <code>Runtime</code> that allows the application to interface with the environment in which the application is running.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="RuntimePermission.html">RuntimePermission</A></B></TD><TD>This class is for runtime permissions.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="SecurityManager.html">SecurityManager</A></B></TD><TD>The security manager is a class that allows applications to implement a security policy.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Short.html">Short</A></B></TD><TD>The Short class is the standard wrapper for short values.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="StrictMath.html">StrictMath</A></B></TD><TD>The class <code>StrictMath</code> contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="String.html">String</A></B></TD><TD>The <code>String</code> class represents character strings.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="StringBuffer.html">StringBuffer</A></B></TD><TD>A string buffer implements a mutable sequence of characters.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="System.html">System</A></B></TD><TD>The <code>System</code> class contains several useful class fields and methods.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Thread.html">Thread</A></B></TD><TD>A <i>thread</i> is a thread of execution in a program.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ThreadGroup.html">ThreadGroup</A></B></TD><TD>A thread group represents a set of threads.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ThreadLocal.html">ThreadLocal</A></B></TD>⌨️ 快捷键说明
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