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

⏎ java/security/acl/Group.java

/*
 * Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 *
 *
 *
 *
 *
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 *
 *
 *
 *
 *
 *
 *
 */

package java.security.acl;

import java.util.Enumeration;
import java.security.Principal;

/**
 * This interface is used to represent a group of principals. (A principal
 * represents an entity such as an individual user or a company). <p>
 *
 * Note that Group extends Principal. Thus, either a Principal or a Group can
 * be passed as an argument to methods containing a Principal parameter. For
 * example, you can add either a Principal or a Group to a Group object by
 * calling the object's {@code addMember} method, passing it the
 * Principal or Group.
 *
 * @author      Satish Dharmaraj
 */
public interface Group extends Principal {

    /**
     * Adds the specified member to the group.
     *
     * @param user the principal to add to this group.
     *
     * @return true if the member was successfully added,
     * false if the principal was already a member.
     */
    public boolean addMember(Principal user);

    /**
     * Removes the specified member from the group.
     *
     * @param user the principal to remove from this group.
     *
     * @return true if the principal was removed, or
     * false if the principal was not a member.
     */
    public boolean removeMember(Principal user);

    /**
     * Returns true if the passed principal is a member of the group.
     * This method does a recursive search, so if a principal belongs to a
     * group which is a member of this group, true is returned.
     *
     * @param member the principal whose membership is to be checked.
     *
     * @return true if the principal is a member of this group,
     * false otherwise.
     */
    public boolean isMember(Principal member);


    /**
     * Returns an enumeration of the members in the group.
     * The returned objects can be instances of either Principal
     * or Group (which is a subclass of Principal).
     *
     * @return an enumeration of the group members.
     */
    public Enumeration<? extends Principal> members();

}

⏎ java/security/acl/Group.java

Or download all of them as a single archive file:

File name: jre-rt-java-1.8.0_191-src.zip
File size: 6664831 bytes
Release date: 2018-10-28
Download 

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