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CSE 2221 Midterm 2 Exam/42 Accurate Questions with Answers
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CSE 2221 Midterm 2 Exam/42 Accurate Questions with Answers
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CSE 2221 Midterm 2 Exam/42 AccurateQuestions with Answers
Precondition - - characterizes the responsibility of the program
that calls the method (the client)
- Post-condition - - characterizes the responsibility of the program that
implements the method (the implementer)
- Parameter Mode - - Part of the contract that specifies the way a method
might change the value of the corresponding argument.
- Clears - - A parameter mode. Upon returning from a method call, a clears-
mode parameter has the initial value for its type.
- Restores - - The default parameter mode. Upon returning from a method
call, a restores-mode parameter has the value it had when it was passed into
the method.
- Replaces - - A parameter mode. Upon returning from a method call, a
replaces-mode parameter may have a different value than its incoming
value, but the method's behavior doesn't depend on the incoming value of
the parameter.
- Testing - - Proving code has an error
- Debugging - - Finding and fixing an error in the code
- Receivers - - Distinguished formal parameters, implicit arguments
- Overloading - - Having methods/variables all with the same name. The
actual constructor is inferred by the program from the argument type.
- .copyFrom() - - Copies values not references
- .newInstance() - - Has the advantage that you don't need to know the
name of any implementation class to call the method
- .compareTo() - - Has all the >,< signs pointing in the same direction
- Primitive types - - Types built-in to Java, refers to an object
- Reference types - - All other types, refers to a location in memory which
points to an object
, - Primitive variable - - Variable of primitive type
- Reference variable - - Variable of reference type
- Reference value - - The memory address of a reference type at which an
object is stored
- Object value - - The actual value of a reference type
- ---> - - We use an arrow instead of "=" to remind ourselves that a variable
is a reference variable
- = - - Copies reference values into other reference variables during
assignment (creating aliasing)
- Uninitialized reference variable - - A reference variable which has been
created but hasn't been assigned a value
- Anonymous reference variable - - A literal, which has an object value but
no name
- Aliasing - - When two or more reference variables point to the same object
(causes problems when one attempts to change the object)
- Parameter passing - - Copies reference values
- Comparing variables - - "==" compares reference values, .equals()
compares object values
- Array - - A group of similar variables all of the same type, a reference type
- Array element - - Each acts like a single variable of the declaration type
- Recursive method - - A method that calls itself
- Implements - - If a class implements an interface then it contains the
method bodies for the behaviors specified in the interface
- Extends - - Can use all methods from the superclass, can override and
modify methods as well
- Override - - Providing a new method body and implementation of a
method inherited from another class, uses @Override annotation
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