JRE 8 rt.jar is the JAR file for JRE 8 RT (Runtime) libraries. JRE (Java Runtime) 8 is the runtime environment included in JDK 8. JRE 8 rt.jar libraries are divided into 6 packages:

com.* - Internal Oracle and Sun Microsystems libraries
java.* - Standard Java API libraries.
javax.* - Extended Java API libraries.
jdk.* -  JDK supporting libraries.
org.* - Third party libraries.
sun.* - Old libraries developed by Sun Microsystems.

JAR File Information:

Directory of C:\fyicenter\jdk-1.8.0_191\jre\lib
      63,596,151 rt.jar

Here is the list of Java classes of the org.* package in JRE 1.8.0_191 rt.jar. Java source codes are also provided.

⏎ org/w3c/dom/xpath/XPathNamespace.java

/*
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

/*
 *
 *
 *
 *
 *
 * Copyright (c) 2002 World Wide Web Consortium,
 * (Massachusetts Institute of Technology, Institut National de
 * Recherche en Informatique et en Automatique, Keio University). All
 * Rights Reserved. This program is distributed under the W3C's Software
 * Intellectual Property License. This program is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE.
 * See W3C License http://www.w3.org/Consortium/Legal/ for more details.
 */

package org.w3c.dom.xpath;


import org.w3c.dom.Element;
import org.w3c.dom.Node;

/**
 * The <code>XPathNamespace</code> interface is returned by
 * <code>XPathResult</code> interfaces to represent the XPath namespace node
 * type that DOM lacks. There is no public constructor for this node type.
 * Attempts to place it into a hierarchy or a NamedNodeMap result in a
 * <code>DOMException</code> with the code <code>HIERARCHY_REQUEST_ERR</code>
 * . This node is read only, so methods or setting of attributes that would
 * mutate the node result in a DOMException with the code
 * <code>NO_MODIFICATION_ALLOWED_ERR</code>.
 * <p>The core specification describes attributes of the <code>Node</code>
 * interface that are different for different node node types but does not
 * describe <code>XPATH_NAMESPACE_NODE</code>, so here is a description of
 * those attributes for this node type. All attributes of <code>Node</code>
 * not described in this section have a <code>null</code> or
 * <code>false</code> value.
 * <p><code>ownerDocument</code> matches the <code>ownerDocument</code> of the
 * <code>ownerElement</code> even if the element is later adopted.
 * <p><code>prefix</code> is the prefix of the namespace represented by the
 * node.
 * <p><code>nodeName</code> is the same as <code>prefix</code>.
 * <p><code>nodeType</code> is equal to <code>XPATH_NAMESPACE_NODE</code>.
 * <p><code>namespaceURI</code> is the namespace URI of the namespace
 * represented by the node.
 * <p><code>adoptNode</code>, <code>cloneNode</code>, and
 * <code>importNode</code> fail on this node type by raising a
 * <code>DOMException</code> with the code <code>NOT_SUPPORTED_ERR</code>.In
 * future versions of the XPath specification, the definition of a namespace
 * node may be changed incomatibly, in which case incompatible changes to
 * field values may be required to implement versions beyond XPath 1.0.
 * <p>See also the <a href='http://www.w3.org/2002/08/WD-DOM-Level-3-XPath-20020820'>Document Object Model (DOM) Level 3 XPath Specification</a>.
 */
public interface XPathNamespace extends Node {
    // XPathNodeType
    /**
     * The node is a <code>Namespace</code>.
     */
    public static final short XPATH_NAMESPACE_NODE      = 13;

    /**
     * The <code>Element</code> on which the namespace was in scope when it
     * was requested. This does not change on a returned namespace node even
     * if the document changes such that the namespace goes out of scope on
     * that element and this node is no longer found there by XPath.
     */
    public Element getOwnerElement();

}

⏎ org/w3c/dom/xpath/XPathNamespace.java

Or download all of them as a single archive file:

File name: jre-rt-org-1.8.0_191-src.zip
File size: 951125 bytes
Release date: 2018-10-28
Download 

⇒ JRE 8 rt.jar - com.* Package Source Code

⇐ JRE 8 rt.jar - javax.* Package Source Code

⇑ Download and Use JDK 8

⇑⇑ FAQ for JDK (Java Development Kit)