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/portable/ValueInputStream.java

/*
 * Copyright (c) 2002, 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.portable;

/**
 * Java to IDL ptc 02-01-12 1.5.1.4
 *
 * ValueInputStream is used for implementing RMI-IIOP
 * stream format version 2.
 */
public interface ValueInputStream {

    /**
     * The start_value method reads a valuetype
     * header for a nested custom valuetype and
     * increments the valuetype nesting depth.
     */
    void start_value();

    /**
     * The end_value method reads the end tag
     * for the nested custom valuetype (after
     * skipping any data that precedes the end
     * tag) and decrements the valuetype nesting
     * depth.
     */
    void end_value();
}

⏎ org/omg/CORBA/portable/ValueInputStream.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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