DisplayMode (Java 2 Platform SE 5.0) (original) (raw)

java.awt

Class DisplayMode

java.lang.Object java.awt.DisplayMode

public final class DisplayMode

extends Object

The DisplayMode class encapsulates the bit depth, height, width, and refresh rate of a GraphicsDevice. Display modes are hardware-dependent and may not always be available.

Since:

1.4

See Also:

GraphicsDevice

BIT_DEPTH_MULTI

public static final int BIT_DEPTH_MULTI

Value of the bit depth if multiple bit depths are supported in this dislay mode.

See Also:

getBitDepth(), Constant Field Values

REFRESH_RATE_UNKNOWN

public static final int REFRESH_RATE_UNKNOWN

Value of the refresh rate if not known

See Also:

getRefreshRate(), Constant Field Values

DisplayMode

public DisplayMode(int width, int height, int bitDepth, int refreshRate)

Create a new display mode object with the supplied parameters.

Parameters:

width - the width of the display, in pixels

height - the height of the display, in pixels

bitDepth - the bit depth of the display, in bits per pixel. This can be BIT_DEPTH_MULTI if multiple bit depths are available.

refreshRate - the refresh rate of the display, in hertz. This can be REFRESH_RATE_UNKNOWN if the information is not available.

See Also:

BIT_DEPTH_MULTI, REFRESH_RATE_UNKNOWN

getHeight

public int getHeight()

Returns:

the height of the display, in pixels

getWidth

public int getWidth()

Returns:

the width of the display, in pixels

getBitDepth

public int getBitDepth()

Returns:

the bit depth of the display, in bits per pixel. This may beBIT_DEPTH_MULTI if multiple bit depths are supported in this display mode.

See Also:

BIT_DEPTH_MULTI

getRefreshRate

public int getRefreshRate()

Returns:

the refresh rate of the display, in hertz. This may beREFRESH_RATE_UNKNOWN if the information is not available.

See Also:

REFRESH_RATE_UNKNOWN

equals

public boolean equals(DisplayMode dm)

Returns:

whether the two display modes are equal

equals

public boolean equals(Object dm)

Description copied from class: [Object](../../java/lang/Object.html#equals%28java.lang.Object%29)

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

• It is reflexive: for any non-null reference valuex, x.equals(x) should returntrue.
• It is symmetric: for any non-null reference valuesx and y, x.equals(y) should return true if and only ify.equals(x) returns true.
• It is transitive: for any non-null reference valuesx, y, and z, ifx.equals(y) returns true andy.equals(z) returns true, thenx.equals(z) should return true.
• It is consistent: for any non-null reference valuesx and y, multiple invocations ofx.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
• For any non-null reference value x,x.equals(null) should return false.

The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x andy, this method returns true if and only if x and y refer to the same object (x == y has the value true).

Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.

Overrides:

[equals](../../java/lang/Object.html#equals%28java.lang.Object%29) in class [Object](../../java/lang/Object.html "class in java.lang")

Parameters:

dm - the reference object with which to compare.

Returns:

whether the two display modes are equal

See Also:

Object.hashCode(), Hashtable

hashCode

public int hashCode()

Description copied from class: [Object](../../java/lang/Object.html#hashCode%28%29)

Returns a hash code value for the object. This method is supported for the benefit of hashtables such as those provided by java.util.Hashtable.

The general contract of hashCode is:

• Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
• If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
• It is not required that if two objects are unequal according to the Object.equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hashtables.

As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the JavaTM programming language.)

Overrides:

[hashCode](../../java/lang/Object.html#hashCode%28%29) in class [Object](../../java/lang/Object.html "class in java.lang")

Returns:

a hash code value for this object

See Also:

Object.equals(java.lang.Object), Hashtable

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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