Java Variant
In Java, Variant is a class that is defined in two different packages.
- javax.ws.rs.core.Variant
- org.eclipse.swt.ole.win32.Variant
javax.ws.rs.core.Variant
It is in-built in JDK. The Java Variant class belongs to javax.ws.rs.core.Variant. It extends the Object class. the class is used for abstraction for a resource representation variant that contains information about media type, language and encoding of the resource representation.
Constructors of the Variant Class
| Constructor |
Description |
| Variant(MediaType mediaType, Locale language, String encoding) |
Create a new instance of Variant. |
| Variant(MediaType mediaType, String language, String encoding) |
| Variant(MediaType m diaType, String language, String country, String encoding) |
| Variant(MediaType mediaType, String language, String country, String languageVariant, String encoding) |
Methods of the Variant Class
The class provides the following methods:
| Method |
Description |
| encodings(String... encodings) |
It creates a Variant.VariantListBuilder initialized with a set of supported encodings. |
| equals(Object obj) |
It compares obj to this variant to see if they are the same considering all property values. |
| getEncoding() |
The method gets the encoding of the variant. |
| getLanguage() |
The method gets the language of the variant. |
| getLanguageString() |
The method gets the string representation of the variant language, or null if no language has been set. |
| getMediaType() |
The method gets the media type of the variant. |
| hashCode() |
The method generates hash code from variant properties. |
| languages(Locale... languages) |
It creates a Variant.VariantListBuilder initialized with a set of supported languages. |
| mediaTypes(MediaType... mediaTypes) |
It creates a Variant.VariantListBuilder initialized with a set of supported media types. |
| toString() |
toString in class Object. |
org.eclipse.swt.ole.win32.Variant
It is a third-party library. A Variant is a generic OLE mechanism for passing data of different types via a common interface. It is used within the OleAutomation object for getting a property, setting a property or invoking a method on an OLE Control or OLE Document.
Fields of The Variant Class
| Field Name |
Description |
| NULL |
A shared Variant instance with type VT_NULL. |
| sizeof |
The size in bytes of a native VARIANT struct. |
Constructors of The Variant Class
| Constructor |
Description |
| Variant() |
It creates an empty Variant object with type VT_EMPTY. |
| Variant(boolean val) |
It creates a Variant object that represents a Java boolean as a VT_BOOL. |
| Variant(double val) |
It creates a Variant object that represents a Java double as a VT_R8. |
| Variant(float val) |
It creates a Variant object that represents a Java float as a VT_R4. |
| Variant(int val) |
It creates a Variant object that represents a Java int as a VT_I4. |
| Variant(long val) |
It creates a Variant object that represents a Java long as a VT_I8. |
| Variant(long ptr, short byRefType) |
It creates a Variant object that contains a reference to the data being transferred. |
| Variant(short val) |
It creates a Variant object that represents a Java short as a VT_I2. |
| Variant(String string) |
It creates a Variant object that represents a Java String as a VT_BSTR. |
| Variant(org.eclipse.swt.internal.ole.win32.IDispatch idispatch) |
It creates a Variant object that represents an IDispatch interface as a VT_Dispatch. |
| Variant(org.eclipse.swt.internal.ole.win32.IUnknown unknown) |
It creates a Variant object that represents an IUnknown interface as a VT_UNKNOWN. |
| Variant(OleAutomation automation) |
It creates a Variant object that represents an IDispatch interface as a VT_Dispatch. |
Methods of The Variant Class
| Method |
Description |
| dispose() |
It releases the resources associated with this Variant. |
| getAutomation() |
The method returns the OleAutomation object represented by this Variant. |
| getBoolean() |
The method returns the Java boolean represented by this Variant. |
| getByRef() |
The method returns a pointer to the referenced data represented by this Variant. |
| getByte() |
The method returns the Java byte represented by this Variant. |
| getChar() |
The method returns the Java char represented by this Variant. |
| getDispatch() |
The method returns the IDispatch object represented by this Variant. |
| getDouble() |
The method returns the Java double represented by this Variant. |
| getFloat() |
The method returns the Java float represented by this Variant. |
| getInt() |
The method returns the Java int represented by this Variant. |
| getLong() |
The method returns the Java long represented by this Variant. |
| getShort() |
The method returns the Java short represented by this Variant. |
| getString() |
The method returns the Java String represented by this Variant. |
| getType() |
The method returns the type of the variant type. |
| getUnknown() |
The method returns the IUnknown object represented by this Variant. |
| setByRef(boolean val) |
The method updates the by reference value of this variant with a new boolean value. |
| setByRef(float val) |
The method updates the by reference value of this variant with a new float value. |
| setByRef(long val) |
The method updates the by reference value of this variant with a new integer value. |
| setByRef(short val) |
The method updates the by reference value of this variant with a new short value. |
| toString() |
The method returns a string containing a concise, human-readable description of the receiver. |
| win32_copy(long pVarDest, Variant varSrc) |
It invokes platform specific functionality to copy a variant into operating system memory. |
| win32_new(long pVariant) |
It invokes platform specific functionality to wrap a variant that was allocated in operating system memory. |
|
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