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/DynStruct.java

/*
 * Copyright (c) 1998, 2004, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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package org.omg.CORBA;

/**
 * The representation of a <code>DynAny</code> object that is associated
 *  with an IDL struct.
 * @deprecated Use the new <a href="../DynamicAny/DynStruct.html">DynStruct</a> instead
 */
@Deprecated
public interface DynStruct extends org.omg.CORBA.Object, org.omg.CORBA.DynAny
{
    /**
     * During a traversal, returns the name of the current member.
     *
     * @return the string name of the current member
     */
    public String current_member_name();

    /**
     * Returns the <code>TCKind</code> object that describes the kind of
         * the current member.
     *
     * @return the <code>TCKind</code> object that describes the current member
     */
    public org.omg.CORBA.TCKind current_member_kind();

    /**
     * Returns an array containing all the members of the stored struct.
     *
     * @return the array of name-value pairs
         * @see #set_members
     */
    public org.omg.CORBA.NameValuePair[] get_members();

    /**
     * Set the members of the struct.
     *
     * @param value the array of name-value pairs.
         * @throws org.omg.CORBA.DynAnyPackage.InvalidSeq if the given argument
         *         is invalid
         * @see #get_members
     */
    public void set_members(org.omg.CORBA.NameValuePair[] value)
        throws org.omg.CORBA.DynAnyPackage.InvalidSeq;
}

⏎ org/omg/CORBA/DynStruct.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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