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 * Copyright (c) 1994, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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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;
}