CSE 2221 Study guides, Class notes & Summaries

How to declare output stream to console - CORRECT ANSWER SimpleWriter out = new SimpleWriter1L(); How to accept input stream from console - CORRECT ANSWER SimpleReader in = new SimpleReader1L(); How to close input/output stream - CORRECT ANSWER ();/(); Simple concatenation - CORRECT ANSWER Use the "+" symbol to combine two strings or characters Basic string assignment - CORRECT ANSWER String temp = "temp"; String assignment from input stream - CORRECT ANSWER String ...

Why is the container class called Stack? - CORRECT ANSWER It follows the same sort of organization and manipulation type that a stack in the program execution would perform LIFO (last-in-first-out) LIFO - CORRECT ANSWER last in first out How is a Stack different than the queue? - CORRECT ANSWER it is like a "dual" A queue is first in first out, while stack is last in first out What are the three methods of StackKernel? - CORRECT ANSWER push pop length What are the three...

In design-by-contract, when is precondition (requires clause) of a method is not satisfied the implementer of a method is obligated to: - ANSWER A. stop the program and report an error B. generate a default result that will let the client know of their error C. make sure the postcondition (ensure clause( is satisfied D. None of the above *ANSWER* Abstraction - ANSWER Providing a valid cover story for the behavior of a system The checkstyle plugin for Eclipse is useful because - A...

The Implements Relation - The implements relation may hold between a class and an interface. If C implements I then class C contains code for the behavior specified in interface I. This means that C has method bodies for instance methods whose contracts are specified in I. The code of C looks like this: class C implements I { // bodies for methods specified in I } The implements relation allows you to separate contracts from their implementations- a best practice for component desi...

Implements - -Holds between an interface and a class -Class has the method bodies for contracts in an interface Extends - -Holds between two classes or two interfaces -Start out with all the contracts or bodies from the previous class/interface -Purpose: Add method bodies, override methods, overload methods -If B extends A, B inherits all of the method bodies in A Precondition - -Client is responsible for meeting requirements -Implementer can assume that it is being met -"Requires claus...

or a method formal parameter p, which parameter mode guarantees that #p cannot appear n the ensures clause for the method's contract? a. clears b. replaces c. restores d. updates - ANSWER B. replaces You may reason about the behavior of Java code involving immutable types exactly as if they were primitive types because: a. "Immutable" and "primitive" are synonyms; there is no difference between them b. Computations involving immutable types are just as efficient as those involving ...

Alias - ANSWER When two reference types point to the same object. Which variable type can be treated as a primitive? - ANSWER Immutable. Which reference types are immutable? - ANSWER XMLTree, String. Implements - ANSWER Classes contain code for methods used within an interface. That code from that class implements the interface. May only hold between a class and an interface.

Why is the container class called Stack? - ANSWER It follows the same sort of organization and manipulation type that a stack in the program execution would perform LIFO (last-in-first-out) LIFO - ANSWER last in first out How is a Stack different than the queue? - ANSWER it is like a "dual" A queue is first in first out, while stack is last in first out What are the three methods of StackKernel? - ANSWER push pop length What are the three methods of the Stack Interface? - ANSWER top r...

How to declare output stream to console - ANSWER SimpleWriter out = new SimpleWriter1L(); How to accept input stream from console - ANSWER SimpleReader in = new SimpleReader1L(); How to close input/output stream - ANSWER ();/(); Simple concatenation - ANSWER Use the "+" symbol to combine two strings or characters Basic string assignment - ANSWER String temp = "temp"