/*

 * Copyright (c) 1994, 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package java.lang;

/**

 * The abstract class {@code Number} is the superclass of platform

 * classes representing numeric values that are convertible to the

 * primitive types {@code byte}, {@code double}, {@code float}, {@code

 * int}, {@code long}, and {@code short}.

 *

 * The specific semantics of the conversion from the numeric value of

 * a particular {@code Number} implementation to a given primitive

 * type is defined by the {@code Number} implementation in question.

 *

 * For platform classes, the conversion is often analogous to a

 * narrowing primitive conversion or a widening primitive conversion

 * as defined in <cite>The Java&trade; Language Specification</cite>

 * for converting between primitive types.  Therefore, conversions may

 * lose information about the overall magnitude of a numeric value, may

 * lose precision, and may even return a result of a different sign

 * than the input.

 *

 * See the documentation of a given {@code Number} implementation for

 * conversion details.

 *

 * @author      Lee Boynton

 * @author      Arthur van Hoff

 * @jls 5.1.2 Widening Primitive Conversions

 * @jls 5.1.3 Narrowing Primitive Conversions

 * @since   1.0

 */

public abstract class Number implements java.io.Serializable {

    /**

     * Returns the value of the specified number as an {@code int}.

     *

     * @return  the numeric value represented by this object after conversion

     *          to type {@code int}.

     */

    public abstract int intValue();

    /**

     * Returns the value of the specified number as a {@code long}.

     *

     * @return  the numeric value represented by this object after conversion

     *          to type {@code long}.

     */

    public abstract long longValue();

    /**

     * Returns the value of the specified number as a {@code float}.

     *

     * @return  the numeric value represented by this object after conversion

     *          to type {@code float}.

     */

    public abstract float floatValue();

    /**

     * Returns the value of the specified number as a {@code double}.

     *

     * @return  the numeric value represented by this object after conversion

     *          to type {@code double}.

     */

    public abstract double doubleValue();

    /**

     * Returns the value of the specified number as a {@code byte}.

     *

     * <p>This implementation returns the result of {@link #intValue} cast

     * to a {@code byte}.

     *

     * @return  the numeric value represented by this object after conversion

     *          to type {@code byte}.

     * @since   1.1

     */

    public byte byteValue() {

        return (byte)intValue();

    }

    /**

     * Returns the value of the specified number as a {@code short}.

     *

     * <p>This implementation returns the result of {@link #intValue} cast

     * to a {@code short}.

     *

     * @return  the numeric value represented by this object after conversion

     *          to type {@code short}.

     * @since   1.1

     */

    public short shortValue() {

        return (short)intValue();

    }

    /** use serialVersionUID from JDK 1.0.2 for interoperability */

    private static final long serialVersionUID = -8742448824652078965L;

}