Name
Object
Synopsis
This class that represent a Java object. Object
is an
ancestor of every Java class. Therefore, a variable of type
Object
can be safely assigned a reference to any Java
object, array, or interface type without casting. In addition, the methods
of this class can be invoked on all objects, arrays, and interface types.
The equals()
method determines whether the current object
is equal to the object passed in. The default case defines two objects as
equivalent if they are the same object instance. However, most subclasses
override this method and use it to test for byte-to-byte equivalence,
instead of testing for the same object instance.
getClass()
returns a Class
object
representing the object’s class or interface. hashCode()
returns a hash code that can be used as a non-unique hashing key for the
object. Note that invoking this method on different objects that are
equivalent according to equals()
must result in the same
value being returned. Also, it is important to point out that two different
objects may return the same hash code. Subclasses may override this method
to return a hash code more suitable to particular object types. The value
returned by the Object
implementation of this method
can always be obtained by calling the
System.identityHashCode()
method.
The wait()
method provides a way for a thread
to wait for a specific condition to be met. notify()
and notifyAll()
allow another thread to signal that either one waiter or all waiters should re-evaluate ...
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