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/IRObjectOperations.java

/*
 * Copyright (c) 1999, 2001, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */
package org.omg.CORBA;


/**
* The interface for <tt>IRObject</tt>.  For more information on
* Operations interfaces, see <a href="doc-files/generatedfiles.html#operations">
* "Generated Files: Operations files"</a>.
*/

/*
 tempout/org/omg/CORBA/IRObjectOperations.java
 Generated by the IBM IDL-to-Java compiler, version 1.0
 from ../../Lib/ir.idl
 Thursday, February 25, 1999 2:11:21 o'clock PM PST
*/

/**
 * This is the Operations interface for the mapping from <tt>IRObject</tt>.
 * Several interfaces are used as base interfaces for objects in
 * the Interface Repository (IR). These base interfaces are not instantiable.
 * A common set of operations is used to locate objects within the
 * Interface Repository. Some of these operations are defined in
 * the IRObject. All IR objects inherit from the IRObject interface,
 * which provides an operation for identifying the actual type of
 * the object. (The IDL base interface IRObject represents the most
 * generic interface from which all other Interface Repository interfaces
 * are derived, even the Repository itself.) All java implementations of
 * IR objects must implement the IRObjectOperations interface.
 * @see IDLTypeOperations
 * @see IDLType
 * @see IRObject
 */
public interface IRObjectOperations
{

    // read interface
    /**
     * Returns the <code>DefinitionKind</code> corresponding to this Interface Repository object.
     * @return the <code>DefinitionKind</code> corresponding to this Interface Repository object.
     */
    org.omg.CORBA.DefinitionKind def_kind ();

    // write interface
    /**
     * Destroys this object. If the object is a Container,
     * this method is applied to all its contents. If the object contains an IDLType
     * attribute for an anonymous type, that IDLType is destroyed.
     * If the object is currently contained in some other object, it is removed.
     * If the method is invoked on a <code>Repository</code> or on a <code>PrimitiveDef</code>
     * then the <code>BAD_INV_ORDER</code> exception is raised with minor value 2.
     * An attempt to destroy an object that would leave the repository in an
     * incoherent state causes <code>BAD_INV_ORDER</code> exception to be raised
     * with the minor code 1.
     * @exception BAD_INV_ORDER if this method is invoked on a repository or
     *            <code>PrimitiveDef</code>, or if an attempt to destroy an
     *            object would leave the repository in an incoherent state
     */
    void destroy ();
} // interface IRObjectOperations

⏎ org/omg/CORBA/IRObjectOperations.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)