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/swing/event/TableColumnModelListener.java

/*
 * Copyright (c) 1997, 1998, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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package javax.swing.event;

import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ChangeEvent;
import java.util.EventListener;

/**
 * TableColumnModelListener defines the interface for an object that listens
 * to changes in a TableColumnModel.
 *
 * @author Alan Chung
 * @see TableColumnModelEvent
 */

public interface TableColumnModelListener extends java.util.EventListener
{
    /** Tells listeners that a column was added to the model. */
    public void columnAdded(TableColumnModelEvent e);

    /** Tells listeners that a column was removed from the model. */
    public void columnRemoved(TableColumnModelEvent e);

    /** Tells listeners that a column was repositioned. */
    public void columnMoved(TableColumnModelEvent e);

    /** Tells listeners that a column was moved due to a margin change. */
    public void columnMarginChanged(ChangeEvent e);

    /**
     * Tells listeners that the selection model of the
     * TableColumnModel changed.
     */
    public void columnSelectionChanged(ListSelectionEvent e);
}

⏎ javax/swing/event/TableColumnModelListener.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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