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/omg/CORBA/AnyHolder.java

/*
 * Copyright (c) 1996, 2001, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 *
 *
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 */

package org.omg.CORBA;

import org.omg.CORBA.portable.Streamable;
import org.omg.CORBA.portable.InputStream;
import org.omg.CORBA.portable.OutputStream;

/**
 * The Holder for <tt>Any</tt>.  For more information on
 * Holder files, see <a href="doc-files/generatedfiles.html#holder">
 * "Generated Files: Holder Files"</a>.<P>
 * A Holder class for <code>Any</code> objects
 * that is used to store "out" and "inout" parameters in IDL methods.
 * If an IDL method signature has an IDL <code>any</code> as an "out"
 * or "inout" parameter, the programmer must pass an instance of
 * <code>AnyHolder</code> as the corresponding
 * parameter in the method invocation; for "inout" parameters, the programmer
 * must also fill the "in" value to be sent to the server.
 * Before the method invocation returns, the ORB will fill in the
 * value corresponding to the "out" value returned from the server.
 * <P>
 * If <code>myAnyHolder</code> is an instance of <code>AnyHolder</code>,
 * the value stored in its <code>value</code> field can be accessed with
 * <code>myAnyHolder.value</code>.
 *
 * @since       JDK1.2
 */
public final class AnyHolder implements  Streamable {
    /**
     * The <code>Any</code> value held by this <code>AnyHolder</code> object.
     */

    public Any value;

    /**
     * Constructs a new <code>AnyHolder</code> object with its
     * <code>value</code> field initialized to <code>null</code>.
     */
    public AnyHolder() {
    }

    /**
     * Constructs a new <code>AnyHolder</code> object for the given
     * <code>Any</code> object.
     * @param initial the <code>Any</code> object with which to initialize
     *                the <code>value</code> field of the new
     *                <code>AnyHolder</code> object
     */
    public AnyHolder(Any initial) {
        value = initial;
    }

    /**
     * Reads from <code>input</code> and initalizes the value in the Holder
     * with the unmarshalled data.
     *
     * @param input the InputStream containing CDR formatted data from the wire.
     */
    public void _read(InputStream input) {
        value = input.read_any();
    }

    /**
     * Marshals to <code>output</code> the value in
     * this <code>AnyHolder</code> object.
     *
     * @param output the OutputStream which will contain the CDR formatted data.
     */
    public void _write(OutputStream output) {
        output.write_any(value);
    }

    /**
     * Returns the <code>TypeCode</code> object corresponding to the value
     * held in this <code>AnyHolder</code> object.
     *
     * @return    the TypeCode of the value held in
     *              this <code>AnyHolder</code> object
     */
    public TypeCode _type() {
        return ORB.init().get_primitive_tc(TCKind.tk_any);
    }
}

⏎ org/omg/CORBA/AnyHolder.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

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