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What is the only time that data from your program exists? correct answers When the program is actually running All parameters in Java are passed by _________ correct answers Value When does a parameter come into existence? correct answers When the method is called When do types come into existence? correct answers At compilation Give three examples of predefined types correct answers Int, char, string Give an example of a user defined type correct answers Class All primitive ty...

Abstraction provides correct answers high level model of activity Procedural abstraction correct answers Specifies actions performed hides algorithms Data abstraction correct answers Specifies data objects for the problem Hides implementations Encapsulation correct answers hides implementation details while providing interface (methods) for data access allows us to use code without knowing its implementation makes debugging and code modification simple Interface correct answers S...

Classes can only extend more than one other class if at least one of those classes is an abstract class. correct answers False - a Class can never extend more than one class. Downcasting can be done implicitly. correct answers False - it must be done explicitly or your code will not compile. "Sideways" casting is never allowed correct answers True '' will refer to the current object, treating it as an instance of the parent of the parent of the current class. correct answers True. F...

CMSC131 Exam 2 Review(Complete solutions) CMSC 131 UMD Midterm 2(A+ Graded) CMSC131 Hardware/Software/Java Terminology(Complete solutions)

false correct answers Python comes pre-installed on Windows machines. false correct answers A computer is a single device that performs different types of tasks for its users. false correct answers Python 3.0 is backwards compatible. true correct answers RAM is a volatile memory used for temporary storage while a program is running. true correct answers Python is an open-source language. true correct answers The CPU understands instructions written in a binary machine language. ...

Analyzing runtime Insert element into position 0 of an array of size n (in java) correct answers Runs in linear time, (if the array is size n and you double it, time will be doubles as well, this is a good way to think about linear time). Analyzing runtime Retrieving an element from an array of size n (at a particular index, in java). correct answers When the CPU has to do the arithmetic to get the element from the specified index, it's a constant time operation. The arithmetic barle...

Solid State Drive correct answers What has no moving parts and operates faster than a traditional disk drive? True correct answers True or False: The main reason to use secondary storage is to hold data for long periods of time, even when the power supply to the computer is turned off. False correct answers True or False: Python 3.0 is backwards compatible. ENIAC correct answers What is considered to be the world's first programmable electronic computer? bit correct answers The smal...

What is the difference between formal verification and testing? correct answers - prove test is correct, bad: time consuming and hard - write test code to check production code, anyone can do it, bad: never quite sure its correct, cant test everything Unit Testing vs Integrated Testing correct answers - frontline, unit like a method, test each little unit - if units work together, possibly whole project JUnit correct answers - part of Java - framework that lets you write tests for code ...

Why data encapsulation is important correct answers Reason #2 (#1 is on CMSC Quiz 5) - wider latitude for modifying the "guts" without having to re-code external modules Key Idea: encapsulate things that might change within a public interface so it won't change * if you don't change API, the rest of the code won't need to change * analogy: if someone changes the spark plugs in the car, the driver won't care bc the car will drive the same How to change API correct answers don'...

What are the three logical operators? correct answers &&, ||, ! Write "truth-tables" for && and ||. correct answers A B A && B A || B -------------------------------------------------- T T T T T F F T F T F T F F F F Is the following boolean expression true or false?((3 < 5) && !(1 > 14) && (-5 < -15)) || ((6 == 6) && !(2 == 2)) correct answers False If s1 and s2 are variables representing Strings, what Java boolean expression is equivalent to "s1 is not the same as s2"? co...