This class keeps track of the current look and feel and its defaults. The default look and feel class is chosen in the following manner:
  1. If the system property swing.defaultlaf is non-null, use it as the default look and feel class name.
  2. If the java.util.Properties file swing.properties exists and contains the key swing.defaultlaf, use its value as default look and feel class name. The location of swing.properties may vary depending upon the implementation of the Java platform. In Sun's implementation this will reside in &java.home>/lib/swing.properties. Refer to the release notes of the implementation you are using for further details.
  3. Otherwise use the Java look and feel.

We manage three levels of defaults: user defaults, look and feel defaults, system defaults. A call to UIManager.get checks all three levels in order and returns the first non-null value for a key, if any. A call to UIManager.put just affects the user defaults. Note that a call to setLookAndFeel doesn't affect the user defaults, it just replaces the middle defaults "level".

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeansTM has been added to the java.beans package. Please see java.beans.XMLEncoder .

@version
1.115 12/19/03
@author
Thomas Ball
@author
Hans Muller
Adds a LookAndFeel to the list of auxiliary look and feels. The auxiliary look and feels tell the multiplexing look and feel what other LookAndFeel classes for a component instance are to be used in addition to the default LookAndFeel class when creating a multiplexing UI. The change will only take effect when a new UI class is created or when the default look and feel is changed on a component instance.

Note these are not the same as the installed look and feels.

Adds a PropertyChangeListener to the listener list. The listener is registered for all properties.
Parameters
listenerthe PropertyChangeListener to be added
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 value x, x.equals(x) should return true.
  • It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
  • It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
  • It is consistent: for any non-null reference values x and y, multiple invocations of x.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 and y, 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.

Parameters
objthe reference object with which to compare.
Return
true if this object is the same as the obj argument; false otherwise.
Returns an object from the defaults table.
Parameters
keyan Object specifying the desired object
Return
the Object
Returns an object from the defaults table that is appropriate for the given locale.
Parameters
keyan Object specifying the desired object
lthe Locale for which the object is desired
Return
the Object
Returns the list of auxiliary look and feels (can be null). The auxiliary look and feels tell the multiplexing look and feel what other LookAndFeel classes for a component instance are to be used in addition to the default LookAndFeel class when creating a multiplexing UI.

Note these are not the same as the installed look and feels.

Return
list of auxiliary LookAndFeels or null
Returns a boolean from the defaults table which is associated with the key value. If the key is not found or the key doesn't represent a boolean value then false will be returned.
Parameters
keyan Object specifying the key for the desired boolean value
Return
the boolean value corresponding to the key
@since
1.4
Returns a boolean from the defaults table which is associated with the key value and the given Locale. If the key is not found or the key doesn't represent a boolean value then false will be returned.
Parameters
keyan Object specifying the key for the desired boolean value
lthe Locale for which the boolean is desired
Return
the boolean value corresponding to the key
@since
1.4
Returns a border from the defaults table.
Parameters
keyan Object specifying the border
Return
the Border object
Returns a border from the defaults table that is appropriate for the given locale.
Parameters
keyan Object specifying the border
lthe Locale for which the border is desired
Return
the Border object
@since
1.4
Returns the runtime class of an object. That Class object is the object that is locked by static synchronized methods of the represented class.
Return
The java.lang.Class object that represents the runtime class of the object. The result is of type {@code Class} where X is the erasure of the static type of the expression on which getClass is called.
Returns a drawing color from the defaults table.
Parameters
keyan Object specifying the color
Return
the Color object
Returns a drawing color from the defaults table that is appropriate for the given locale.
Parameters
keyan Object specifying the color
lthe Locale for which the color is desired
Return
the Color object
@since
1.4
Returns the name of the LookAndFeel class that implements the default cross platform look and feel -- the Java Look and Feel (JLF). If the system property swing.crossplatformlaf has been defined, its value will be returned.
Return
a string with the JLF implementation-class
Returns the default values for this look and feel.
Return
a UIDefaults object containing the default values
Returns a dimension from the defaults table.
Parameters
keyan Object specifying the dimension object
Return
the Dimension object
Returns a dimension from the defaults table that is appropriate for the given locale.
Parameters
keyan Object specifying the dimension object
lthe Locale for which the object is desired
Return
the Dimension object
@since
1.4
Returns a drawing font from the defaults table.
Parameters
keyan Object specifying the font
Return
the Font object
Returns a drawing font from the defaults table that is appropriate for the given locale.
Parameters
keyan Object specifying the font
lthe Locale for which the font is desired
Return
the Font object
@since
1.4
Returns an Icon from the defaults table.
Parameters
keyan Object specifying the icon
Return
the Icon object
Returns an Icon from the defaults table that is appropriate for the given locale.
Parameters
keyan Object specifying the icon
lthe Locale for which the icon is desired
Return
the Icon object
@since
1.4
Returns an Insets object from the defaults table.
Parameters
keyan Object specifying the Insets object
Return
the Insets object
Returns an Insets object from the defaults table that is appropriate for the given locale.
Parameters
keyan Object specifying the Insets object
lthe Locale for which the object is desired
Return
the Insets object
@since
1.4
Returns an array of objects that provide some information about the LookAndFeel implementations that have been installed with this software development kit. The LookAndFeel info objects can used by an application to construct a menu of look and feel options for the user or to set the look and feel at start up time. Note that we do not return the LookAndFeel classes themselves here to avoid the cost of unnecessarily loading them.

Given a LookAndFeelInfo object one can set the current look and feel like this:

 UIManager.setLookAndFeel(info.getClassName());
 
Return
an array of LookAndFeelInfo objects
Returns an integer from the defaults table.
Parameters
keyan Object specifying the int
Return
the int
Returns an integer from the defaults table that is appropriate for the given locale.
Parameters
keyan Object specifying the int
lthe Locale for which the int is desired
Return
the int
@since
1.4
Returns the current default look and feel or null.
Return
the current default look and feel, or null
Returns the default values for this look and feel.
Return
an UIDefaults object containing the default values
Returns an array of all the PropertyChangeListeners added to this UIManager with addPropertyChangeListener().
Return
all of the PropertyChangeListeners added or an empty array if no listeners have been added
@since
1.4
Returns a string from the defaults table.
Parameters
keyan Object specifying the string
Return
the String
Returns a string from the defaults table that is appropriate for the given locale.
Parameters
keyan Object specifying the string
lthe Locale for which the string is desired
Return
the String
Returns the name of the LookAndFeel class that implements the native systems look and feel if there is one, otherwise the name of the default cross platform LookAndFeel class. If the system property swing.systemlaf has been defined, its value will be returned.
Return
the String of the LookAndFeel class
Returns the L&F object that renders the target component.
Parameters
targetthe JComponent to render
Return
the ComponentUI object that renders the target component
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 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.)

Return
a hash code value for this object.
Creates a new look and feel and adds it to the current array. Then calls #setInstalledLookAndFeels .
Parameters
namea String specifying the name of the look and feel
classNamea String specifying the class name that implements the look and feel
Adds the specified look and feel to the current array and then calls #setInstalledLookAndFeels .
Parameters
infoa LookAndFeelInfo object that names the look and feel and identifies that class that implements it
Wakes up a single thread that is waiting on this object's monitor. If any threads are waiting on this object, one of them is chosen to be awakened. The choice is arbitrary and occurs at the discretion of the implementation. A thread waits on an object's monitor by calling one of the wait methods.

The awakened thread will not be able to proceed until the current thread relinquishes the lock on this object. The awakened thread will compete in the usual manner with any other threads that might be actively competing to synchronize on this object; for example, the awakened thread enjoys no reliable privilege or disadvantage in being the next thread to lock this object.

This method should only be called by a thread that is the owner of this object's monitor. A thread becomes the owner of the object's monitor in one of three ways:

  • By executing a synchronized instance method of that object.
  • By executing the body of a synchronized statement that synchronizes on the object.
  • For objects of type Class, by executing a synchronized static method of that class.

Only one thread at a time can own an object's monitor.

Throws
IllegalMonitorStateExceptionif the current thread is not the owner of this object's monitor.
Wakes up all threads that are waiting on this object's monitor. A thread waits on an object's monitor by calling one of the wait methods.

The awakened threads will not be able to proceed until the current thread relinquishes the lock on this object. The awakened threads will compete in the usual manner with any other threads that might be actively competing to synchronize on this object; for example, the awakened threads enjoy no reliable privilege or disadvantage in being the next thread to lock this object.

This method should only be called by a thread that is the owner of this object's monitor. See the notify method for a description of the ways in which a thread can become the owner of a monitor.

Throws
IllegalMonitorStateExceptionif the current thread is not the owner of this object's monitor.
Stores an object in the defaults table.
Parameters
keyan Object specifying the retrieval key
valuethe Object to store
Return
the Object returned by {@link UIDefaults#put}
Removes a LookAndFeel from the list of auxiliary look and feels. The auxiliary look and feels tell the multiplexing look and feel what other LookAndFeel classes for a component instance are to be used in addition to the default LookAndFeel class when creating a multiplexing UI. The change will only take effect when a new UI class is created or when the default look and feel is changed on a component instance.

Note these are not the same as the installed look and feels.

Return
true if the LookAndFeel was removed from the list
Removes a PropertyChangeListener from the listener list. This removes a PropertyChangeListener that was registered for all properties.
Parameters
listenerthe PropertyChangeListener to be removed
Replaces the current array of installed LookAndFeelInfos.
Parameters
infosnew array of LookAndFeelInfo objects
Sets the current default look and feel using a LookAndFeel object.

This is a JavaBeans bound property.

Parameters
newLookAndFeelthe LookAndFeel object
Throws
UnsupportedLookAndFeelExceptionif lnf.isSupportedLookAndFeel() is false
Sets the current default look and feel using a class name.
Parameters
classNamea string specifying the name of the class that implements the look and feel
Throws
ClassNotFoundExceptionif the LookAndFeel class could not be found
InstantiationExceptionif a new instance of the class couldn't be created
IllegalAccessExceptionif the class or initializer isn't accessible
UnsupportedLookAndFeelExceptionif lnf.isSupportedLookAndFeel() is false
Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

 getClass().getName() + '@' + Integer.toHexString(hashCode())
 
Return
a string representation of the object.
Causes current thread to wait until another thread invokes the method or the method for this object. In other words, this method behaves exactly as if it simply performs the call wait(0).

The current thread must own this object's monitor. The thread releases ownership of this monitor and waits until another thread notifies threads waiting on this object's monitor to wake up either through a call to the notify method or the notifyAll method. The thread then waits until it can re-obtain ownership of the monitor and resumes execution.

As in the one argument version, interrupts and spurious wakeups are possible, and this method should always be used in a loop:

     synchronized (obj) {
         while (<condition does not hold>)
             obj.wait();
         ... // Perform action appropriate to condition
     }
 
This method should only be called by a thread that is the owner of this object's monitor. See the notify method for a description of the ways in which a thread can become the owner of a monitor.
Throws
IllegalMonitorStateExceptionif the current thread is not the owner of the object's monitor.
InterruptedExceptionif another thread interrupted the current thread before or while the current thread was waiting for a notification. The interrupted status of the current thread is cleared when this exception is thrown.
Causes current thread to wait until either another thread invokes the method or the method for this object, or a specified amount of time has elapsed.

The current thread must own this object's monitor.

This method causes the current thread (call it T) to place itself in the wait set for this object and then to relinquish any and all synchronization claims on this object. Thread T becomes disabled for thread scheduling purposes and lies dormant until one of four things happens:

  • Some other thread invokes the notify method for this object and thread T happens to be arbitrarily chosen as the thread to be awakened.
  • Some other thread invokes the notifyAll method for this object.
  • Some other thread interrupts thread T.
  • The specified amount of real time has elapsed, more or less. If timeout is zero, however, then real time is not taken into consideration and the thread simply waits until notified.
The thread T is then removed from the wait set for this object and re-enabled for thread scheduling. It then competes in the usual manner with other threads for the right to synchronize on the object; once it has gained control of the object, all its synchronization claims on the object are restored to the status quo ante - that is, to the situation as of the time that the wait method was invoked. Thread T then returns from the invocation of the wait method. Thus, on return from the wait method, the synchronization state of the object and of thread T is exactly as it was when the wait method was invoked.

A thread can also wake up without being notified, interrupted, or timing out, a so-called spurious wakeup. While this will rarely occur in practice, applications must guard against it by testing for the condition that should have caused the thread to be awakened, and continuing to wait if the condition is not satisfied. In other words, waits should always occur in loops, like this one:

     synchronized (obj) {
         while (<condition does not hold>)
             obj.wait(timeout);
         ... // Perform action appropriate to condition
     }
 
(For more information on this topic, see Section 3.2.3 in Doug Lea's "Concurrent Programming in Java (Second Edition)" (Addison-Wesley, 2000), or Item 50 in Joshua Bloch's "Effective Java Programming Language Guide" (Addison-Wesley, 2001).

If the current thread is interrupted by another thread while it is waiting, then an InterruptedException is thrown. This exception is not thrown until the lock status of this object has been restored as described above.

Note that the wait method, as it places the current thread into the wait set for this object, unlocks only this object; any other objects on which the current thread may be synchronized remain locked while the thread waits.

This method should only be called by a thread that is the owner of this object's monitor. See the notify method for a description of the ways in which a thread can become the owner of a monitor.

Parameters
timeoutthe maximum time to wait in milliseconds.
Throws
IllegalArgumentExceptionif the value of timeout is negative.
IllegalMonitorStateExceptionif the current thread is not the owner of the object's monitor.
InterruptedExceptionif another thread interrupted the current thread before or while the current thread was waiting for a notification. The interrupted status of the current thread is cleared when this exception is thrown.
Causes current thread to wait until another thread invokes the method or the method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.

This method is similar to the wait method of one argument, but it allows finer control over the amount of time to wait for a notification before giving up. The amount of real time, measured in nanoseconds, is given by:

 1000000*timeout+nanos

In all other respects, this method does the same thing as the method of one argument. In particular, wait(0, 0) means the same thing as wait(0).

The current thread must own this object's monitor. The thread releases ownership of this monitor and waits until either of the following two conditions has occurred:

  • Another thread notifies threads waiting on this object's monitor to wake up either through a call to the notify method or the notifyAll method.
  • The timeout period, specified by timeout milliseconds plus nanos nanoseconds arguments, has elapsed.

The thread then waits until it can re-obtain ownership of the monitor and resumes execution.

As in the one argument version, interrupts and spurious wakeups are possible, and this method should always be used in a loop:

     synchronized (obj) {
         while (<condition does not hold>)
             obj.wait(timeout, nanos);
         ... // Perform action appropriate to condition
     }
 
This method should only be called by a thread that is the owner of this object's monitor. See the notify method for a description of the ways in which a thread can become the owner of a monitor.
Parameters
timeoutthe maximum time to wait in milliseconds.
nanosadditional time, in nanoseconds range 0-999999.
Throws
IllegalArgumentExceptionif the value of timeout is negative or the value of nanos is not in the range 0-999999.
IllegalMonitorStateExceptionif the current thread is not the owner of this object's monitor.
InterruptedExceptionif another thread interrupted the current thread before or while the current thread was waiting for a notification. The interrupted status of the current thread is cleared when this exception is thrown.