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Chapter 25 The java.lang Package |
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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
}
Hierarchy:
Object->Number(Serializable)->Double
Returned By:
Double.valueOf()
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java.lang.Error (JDK 1.0) |
