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/jmx/snmp/IPAcl/JDMCommunities.java

/*
 * Copyright (c) 1997, 2007, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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/* Generated By:JJTree: Do not edit this line. JDMCommunities.java */

package com.sun.jmx.snmp.IPAcl;


class JDMCommunities extends SimpleNode {
  JDMCommunities(int id) {
    super(id);
  }

  JDMCommunities(Parser p, int id) {
    super(p, id);
  }

  public static Node jjtCreate(int id) {
      return new JDMCommunities(id);
  }

  public static Node jjtCreate(Parser p, int id) {
      return new JDMCommunities(p, id);
  }

  public void buildCommunities(AclEntryImpl entry){
        for (int i =0 ; i < children.length ; i++)
          entry.addCommunity(((JDMCommunity)children[i]).getCommunity());
  }
}

⏎ com/sun/jmx/snmp/IPAcl/JDMCommunities.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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