src/java.base/share/classes/java/util/EventObject.java
author smarks
Mon, 30 Oct 2017 17:49:33 -0700
changeset 47478 438e0c9f2f17
parent 47216 71c04702a3d5
child 57956 e0b8b019d2f5
permissions -rw-r--r--
8190382: fix small typographic errors in comments Reviewed-by: martin Contributed-by: christoph.dreis@freenet.de
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/*
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 * Copyright (c) 1996, 2003, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package java.util;
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/**
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 * <p>
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 * The root class from which all event state objects shall be derived.
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 * <p>
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 * All Events are constructed with a reference to the object, the "source",
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 * that is logically deemed to be the object upon which the Event in question
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 * initially occurred upon.
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 *
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 * @since 1.1
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 */
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public class EventObject implements java.io.Serializable {
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    private static final long serialVersionUID = 5516075349620653480L;
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    /**
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     * The object on which the Event initially occurred.
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     */
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    protected transient Object source;
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    /**
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     * Constructs a prototypical Event.
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     *
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     * @param source the object on which the Event initially occurred
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     * @throws IllegalArgumentException if source is null
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     */
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    public EventObject(Object source) {
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        if (source == null)
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            throw new IllegalArgumentException("null source");
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        this.source = source;
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    }
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    /**
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     * The object on which the Event initially occurred.
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     *
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     * @return the object on which the Event initially occurred
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     */
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    public Object getSource() {
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        return source;
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    }
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    /**
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     * Returns a String representation of this EventObject.
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     *
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     * @return a String representation of this EventObject
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     */
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    public String toString() {
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        return getClass().getName() + "[source=" + source + "]";
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    }
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}