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object > exception > unchecked exception

unchecked exception
subject			fact

unchecked exception	has definition An exception that is not checked , which is of the class RuntimeException and its subclasses, or of the class Error and its subclasses
	is a subtopic of Exception Handling
	is a kind of exception
exception	if an exception is raised in a statement that is not in a try block with an appropriate catch statement then Java looks to see if the caller of the current method is within a try block that has an appropriate catch block if this is not successful, Java looks at callers right up to the main program otherwise Java reports an error if it has not been able to find any suitable catch block
	is thrown when something goes wrong in the execution of a program
	see also Exception class
object	can access all instance variables of all objects of its class
	can be encapsulated by providing accessor methods
	can be converted into a string using the toString method
	can be referred to without reference to the instance variables contained in it
	can be referred to by several different variables at the same time
	can communicate with every object to which it has access through its public interface
	can convert itself to a string representation using the toString method
	can model a real-world object or an abstract concept
	can notify other objects that a condition variable has changed
	can receive messages from objects in the same process objects in different processes objects on the same machine objects on different machines
	can represent any entity to which you can associate properties and behaviour
	can return its class using the getClass method
	can send messages to objects in the same process objects in different processes objects on the same machine objects on different machines
	can wait on 0 or more condition variables
	communicates with other objects by sending and receiving messages
	has 0 or more instance variables
	has 0 or more methods called instance methods
	has behaviour that is specified by its methods
	has state that is maintained in its variables
	has example of creation String name = new String();
	has part public interface
	hides methods from other objects using the 'private' keyword
	inherits instance methods and instance variables from the class to which it belongs all that class's superclasses
	is distinct from every other object even if they contain the same data
	is created by declaring and initializing it such that it is created whenever execution enters a particular block, or, in the case of an instance variable, when an instance is created, for example: String aString = "some text"; or by declaring it and initializing it later using the new operator, for example: String aString; aString = new String("some text");
	shares every instance method of its class with the other instances of its class
	shares its implementation with other instances of its class
	shares one copy of each class variable of its class with the other instances of its class
	to create you use the new operator

Kinds of unchecked exception :

• error (3 facts) - An exception that is exempted from compile-time checking because it can occur at many points in the program and recovery from them is difficult or impossible . A Java program declaring such exceptions would be cluttered, pointlessly.

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