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/io/IOError.java

/*
 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.io;

/**
 * Thrown when a serious I/O error has occurred.
 *
 * @author  Xueming Shen
 * @since   1.6
 */
public class IOError extends Error {
    /**
     * Constructs a new instance of IOError with the specified cause. The
     * IOError is created with the detail message of
     * <tt>(cause==null ? null : cause.toString())</tt> (which typically
     * contains the class and detail message of cause).
     *
     * @param  cause
     *         The cause of this error, or <tt>null</tt> if the cause
     *         is not known
     */
    public IOError(Throwable cause) {
        super(cause);
    }

    private static final long serialVersionUID = 67100927991680413L;
}

⏎ java/io/IOError.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 

⇒ JRE 8 rt.jar - javax.* Package Source Code

⇐ JRE 8 plugin.jar - Java Deploy Control Panel Plugin

⇑ Download and Use JDK 8

⇑⇑ FAQ for JDK (Java Development Kit)