[Chapter 25] 25.17 java.lang.Double (JDK 1.0)

25.17 java.lang.Double (JDK 1.0)

This class provides an immutable object wrapper around the double primitive data type. valueOf() converts a string to a Double, doubleValue() returns the primitive double value of a Double object, and there are other methods for returning a Double value as a variety of other primitive types.

This class also provides some useful constants and static methods for testing double values. MIN_VALUE and MAX_VALUE are the smallest (closest to zero) and largest representable double values. isInfinite() in class method and instance method forms tests whether a double or a Double has an infinite value. Similarly, isNaN() tests whether a double or Double is not-a-number--this is a comparison that cannot be done directly because the NaN constant never tests equal to any other value, including itself. doubleToLongBits() and longBitsToDouble() allow you to manipulate the bit representation of a double directly.


public final class Double extends Number {

    // Public Constructors

            public Double(double value);

            public Double(String s) throws NumberFormatException;

    // Constants

            public static final double MAX_VALUE;

            public static final double MIN_VALUE;

            public static final double NEGATIVE_INFINITY;

            public static final double NaN;

            public static final double POSITIVE_INFINITY;

        1.1public static final Class TYPE;

    // Class Methods

            public static native long doubleToLongBits(double value);

            public static boolean isInfinite(double v);

            public static boolean isNaN(double v);

            public static native double longBitsToDouble(long bits);

            public static String toString(double d);

            public static Double valueOf(String s) throws NumberFormatException;

    // Public Instance Methods

        1.1public byte byteValue();  // Overrides Number

            public double doubleValue();  // Defines Number

            public boolean equals(Object obj);  // Overrides Object

            public float floatValue();  // Defines Number

            public int hashCode();  // Overrides Object

            public int intValue();  // Defines Number

            public boolean isInfinite();

            public boolean isNaN();

            public long longValue();  // Defines Number

        1.1public short shortValue();  // Overrides Number

            public String toString();  // Overrides Object

}

25.17 java.lang.Double (JDK 1.0)

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