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Commas are used to separate multiple statements within the initialization and iteration parts of a for statement.
The wait(),notify(), and notifyAll() methods are used to provide an efficient way for threads to wait for a shared resource. When a thread executes an object's wait() method, it enters the waiting state. It only enters the ready state after another thread invokes the object's notify() or notifyAll() methods..
An abstract method is a method whose implementation is deferred to a subclass.\
A Java source code file takes the name of a public class or interface that is defined within the file. A source code file may contain at most one public class or interface. If a public class or interface is defined within a source code file, then the source code file must take the name of the public class or interface. If no public class or interface is defined within a source code file, then the file must take on a name that is different than its classes and interfaces. Source code files use the .java extension.
A Canvas object provides access to a Graphics object via its paint() method.
The high-level thread states are ready, running, waiting, and dead.
The read() method returns -1 when it has reached the end of a file.
No, an object cannot be cast to a primitive value.
A non-static inner class may have object instances that are associated with instances of the class's outer class. A static inner class does not have any object instances.