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/awt/dnd/DragSourceDropEvent.java

/*
 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package java.awt.dnd;

/**
 * The <code>DragSourceDropEvent</code> is delivered
 * from the <code>DragSourceContextPeer</code>,
 * via the <code>DragSourceContext</code>, to the <code>dragDropEnd</code>
 * method of <code>DragSourceListener</code>s registered with that
 * <code>DragSourceContext</code> and with its associated
 * <code>DragSource</code>.
 * It contains sufficient information for the
 * originator of the operation
 * to provide appropriate feedback to the end user
 * when the operation completes.
 * <P>
 * @since 1.2
 */

public class DragSourceDropEvent extends DragSourceEvent {

    private static final long serialVersionUID = -5571321229470821891L;

    /**
     * Construct a <code>DragSourceDropEvent</code> for a drop,
     * given the
     * <code>DragSourceContext</code>, the drop action,
     * and a <code>boolean</code> indicating if the drop was successful.
     * The coordinates for this <code>DragSourceDropEvent</code>
     * are not specified, so <code>getLocation</code> will return
     * <code>null</code> for this event.
     * <p>
     * The argument <code>action</code> should be one of <code>DnDConstants</code>
     * that represents a single action.
     * This constructor does not throw any exception for invalid <code>action</code>.
     *
     * @param dsc the <code>DragSourceContext</code>
     * associated with this <code>DragSourceDropEvent</code>
     * @param action the drop action
     * @param success a boolean indicating if the drop was successful
     *
     * @throws IllegalArgumentException if <code>dsc</code> is <code>null</code>.
     *
     * @see DragSourceEvent#getLocation
     */

    public DragSourceDropEvent(DragSourceContext dsc, int action, boolean success) {
        super(dsc);

        dropSuccess = success;
        dropAction  = action;
    }

    /**
     * Construct a <code>DragSourceDropEvent</code> for a drop, given the
     * <code>DragSourceContext</code>, the drop action, a <code>boolean</code>
     * indicating if the drop was successful, and coordinates.
     * <p>
     * The argument <code>action</code> should be one of <code>DnDConstants</code>
     * that represents a single action.
     * This constructor does not throw any exception for invalid <code>action</code>.
     *
     * @param dsc the <code>DragSourceContext</code>
     * associated with this <code>DragSourceDropEvent</code>
     * @param action the drop action
     * @param success a boolean indicating if the drop was successful
     * @param x   the horizontal coordinate for the cursor location
     * @param y   the vertical coordinate for the cursor location
     *
     * @throws IllegalArgumentException if <code>dsc</code> is <code>null</code>.
     *
     * @since 1.4
     */
    public DragSourceDropEvent(DragSourceContext dsc, int action,
                               boolean success, int x, int y) {
        super(dsc, x, y);

        dropSuccess = success;
        dropAction  = action;
    }

    /**
     * Construct a <code>DragSourceDropEvent</code>
     * for a drag that does not result in a drop.
     * The coordinates for this <code>DragSourceDropEvent</code>
     * are not specified, so <code>getLocation</code> will return
     * <code>null</code> for this event.
     *
     * @param dsc the <code>DragSourceContext</code>
     *
     * @throws IllegalArgumentException if <code>dsc</code> is <code>null</code>.
     *
     * @see DragSourceEvent#getLocation
     */

    public DragSourceDropEvent(DragSourceContext dsc) {
        super(dsc);

        dropSuccess = false;
    }

    /**
     * This method returns a <code>boolean</code> indicating
     * if the drop was successful.
     *
     * @return <code>true</code> if the drop target accepted the drop and
     *         successfully performed a drop action;
     *         <code>false</code> if the drop target rejected the drop or
     *         if the drop target accepted the drop, but failed to perform
     *         a drop action.
     */

    public boolean getDropSuccess() { return dropSuccess; }

    /**
     * This method returns an <code>int</code> representing
     * the action performed by the target on the subject of the drop.
     *
     * @return the action performed by the target on the subject of the drop
     *         if the drop target accepted the drop and the target drop action
     *         is supported by the drag source; otherwise,
     *         <code>DnDConstants.ACTION_NONE</code>.
     */

    public int getDropAction() { return dropAction; }

    /*
     * fields
     */

    /**
     * <code>true</code> if the drop was successful.
     *
     * @serial
     */
    private boolean dropSuccess;

    /**
     * The drop action.
     *
     * @serial
     */
    private int     dropAction   = DnDConstants.ACTION_NONE;
}

⏎ java/awt/dnd/DragSourceDropEvent.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)