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 com.* package in JRE 1.8.0_191 rt.jar. Java source codes are also provided.

⏎ com/sun/javadoc/MemberDoc.java

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

/**
 * Represents a member of a java class: field, constructor, or method.
 * This is an abstract class dealing with information common to
 * method, constructor and field members. Class members of a class
 * (innerclasses) are represented instead by ClassDoc.
 *
 * @see MethodDoc
 * @see FieldDoc
 * @see ClassDoc
 *
 * @author Kaiyang Liu (original)
 * @author Robert Field (rewrite)
 */
public interface MemberDoc extends ProgramElementDoc {

    /**
     * Returns true if this member was synthesized by the compiler.
     */
    boolean isSynthetic();
}

⏎ com/sun/javadoc/MemberDoc.java

Or download all of them as a single archive file:

File name: jre-rt-com-1.8.0_191-src.zip
File size: 8099783 bytes
Release date: 2018-10-28
Download 

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