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

⏎ javax/lang/model/element/Modifier.java

/*
 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package javax.lang.model.element;


/**
 * Represents a modifier on a program element such
 * as a class, method, or field.
 *
 * <p>Not all modifiers are applicable to all kinds of elements.
 * When two or more modifiers appear in the source code of an element
 * then it is customary, though not required, that they appear in the same
 * order as the constants listed in the detail section below.
 *
 * <p>Note that it is possible additional modifiers will be added in
 * future versions of the platform.
 *
 * @author Joseph D. Darcy
 * @author Scott Seligman
 * @author Peter von der Ah&eacute;
 * @since 1.6
 */

public enum Modifier {

    // See JLS sections 8.1.1, 8.3.1, 8.4.3, 8.8.3, and 9.1.1.
    // java.lang.reflect.Modifier includes INTERFACE, but that's a VMism.

    /** The modifier {@code public} */          PUBLIC,
    /** The modifier {@code protected} */       PROTECTED,
    /** The modifier {@code private} */         PRIVATE,
    /** The modifier {@code abstract} */        ABSTRACT,
    /**
     * The modifier {@code default}
     * @since 1.8
     */
     DEFAULT,
    /** The modifier {@code static} */          STATIC,
    /** The modifier {@code final} */           FINAL,
    /** The modifier {@code transient} */       TRANSIENT,
    /** The modifier {@code volatile} */        VOLATILE,
    /** The modifier {@code synchronized} */    SYNCHRONIZED,
    /** The modifier {@code native} */          NATIVE,
    /** The modifier {@code strictfp} */        STRICTFP;

    /**
     * Returns this modifier's name in lowercase.
     */
    public String toString() {
        return name().toLowerCase(java.util.Locale.US);
    }
}

⏎ javax/lang/model/element/Modifier.java

Or download all of them as a single archive file:

File name: jre-rt-javax-1.8.0_191-src.zip
File size: 5381005 bytes
Release date: 2018-10-28
Download 

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

⇐ JRE 8 rt.jar - java.* Package Source Code

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