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/SnmpOidTable.java

/*
 *
 * Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
// Copyright (c) 1995-96 by Cisco Systems, Inc.

package com.sun.jmx.snmp;

// java import
//
import java.util.Vector;


/**
 * Defines the minimum functionality that should be provided by
 * a class containing metadata definitions for variables of a MIB.
 * A name can be resolved against a table of MIB variables.
 * Each entry in the table is an <CODE>SnmpOidRecord</CODE> object that contains a name, a dot-separated OID string,
 * and the corresponding SMI type of the variable.
 * <P>
 * If you need to load a specific <CODE>SnmpOidTable</CODE>, just call the static method
 * {@link com.sun.jmx.snmp.SnmpOid#setSnmpOidTable <CODE>SnmpOid.setSnmpOidTable(<I>myOidTable</I>)</CODE>}.
 *
 * <p><b>This API is a Sun Microsystems internal API  and is subject
 * to change without notice.</b></p>
 * @see com.sun.jmx.snmp.SnmpOidRecord
 *
 *
 */


public interface SnmpOidTable {

    /**
     * Searches for a MIB variable given its logical name and returns an {@link com.sun.jmx.snmp.SnmpOidRecord} object
     * containing information on the variable.
     *
     * @param name The name of the MIB variable.
     * @return The <CODE>SnmpOidRecord</CODE> object containing information on the variable.
     * @exception SnmpStatusException If the variable is not found.
     */
    public SnmpOidRecord resolveVarName(String name)
        throws SnmpStatusException;


    /**
     * Searches for a MIB variable given its OID and returns an {@link com.sun.jmx.snmp.SnmpOidRecord} object
     * containing information on the variable.
     *
     * @param oid The OID of the MIB variable.
     * @return The <CODE>SnmpOidRecord</CODE> object containing information
     *         on the variable.
     * @exception SnmpStatusException If the variable is not found.
     */
    public SnmpOidRecord resolveVarOid(String oid)
        throws SnmpStatusException;

    /**
     * Returns a list that can be used to traverse all the entries this <CODE>SnmpOidTable</CODE>.
     * @return A Vector of {@link com.sun.jmx.snmp.SnmpOidRecord} objects.
     */
    public Vector<?> getAllEntries();
}

⏎ com/sun/jmx/snmp/SnmpOidTable.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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