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1 Epic Test Review 1 Epic Test Review 2 Epic Test Review 3 Epic Test Review 4 Write a line of code that outputs the phase Hello World to the console without creating a new line character. System.out.print( Hello World ); Write one or two lines of code that result in it printing out the statement Hello on the first line and World on the second. System.out.println( Hello ); System.out.println( World ); System.out.println( Hello\nWorld ); Write an if-statement that will execute if both a is true and b is true. if(a && b) if(a == true && b == true) Write an if-statement that will execute if either a is true or b is true. if(a b) if(a == true b == true) Epic Test Review 5 Epic Test Review 6 Epic Test Review 7 Epic Test Review 8 Write some code that returns true if x is less than 5, and false otherwise. if(x < 5) return true else return false return x < 5 Write the first line of a for loop that executes 7 times. for(int x = 0; x < 7; x++); for(int x = 1; x <= 7; x++); for(int x = 7; x > 0; x--); Write the first line of a for loop that executes 3 times, starting with x = 2. for(int x = 2; x < 5; x++); for(int x = 2; x <= 4; x++); for(int x = 2; x >= 0; x--); for(int x = 2; x > -1; x--); Write the first line of a while loop that executes so long as c is greater than 2 and d is less than 10. while(c > 2 && d < 10)
2 Epic Test Review 9 Epic Test Review 10 Epic Test Review 11 Epic Test Review 12 What two values can a single bit contain? 0 or 1 How many bits are in a byte? 8 The number 65 is used to represent the character A in a certain system used to help computers display letters. What is this system called? Old programming languages which relied on manually flipping electrical currents on and off through manipulating 1s and 0s is known as what kind of language? ASCII Machine language Unicode is incorrect, but a good try! Epic Test Review 13 Epic Test Review 14 Epic Test Review 15 Epic Test Review 16 A programming language which uses simple keywords like ADD to directly interact with memory addresses is known as what kind of language? Assembly language Most modern programming languages are highly abstracted from binary and has many advanced tools to allow for complex development. What are these languages called? High level language Give three examples of a high level language. Processing, C, C++, C#, Java, Alice, Python, Perl, Lisp, FORTRAN, COBOL, Visual BASIC A software design method that focuses on proceeding in order from design, to coding, to testing, to maintenance is known as the method. Waterfall
3 Epic Test Review 17 Epic Test Review 18 Epic Test Review 19 Epic Test Review 20 An individual instruction in a program (a full line of code) is known as a. statement A piece of data passed to a method is known as a. parameter What operator is used to return the remainder of a division? Modulus % Write the symbol for the assignment operator and the comparison operator, labeling each one. Assignment = Comparison == Epic Test Review 21 Epic Test Review 22 Epic Test Review 23 Epic Test Review 24 Name any six data types. boolean byte short int long float double Char String (not primitive!) Name one difference between a literal and a variable? A variable can be stored A variable can change its value Name one difference between a literal and a constant? A constant can be stored Name one difference between a constant and a variable? A variable can change its value
4 Epic Test Review 25 Epic Test Review 26 Epic Test Review 27 Epic Test Review 28 What naming convention is used for variables and methods in Java? camelcase When you declare a variable inside a method, it can only be accessed there. What kind of variable is this? local When you declare a variable outside of a method, but inside a class, what is it called? class-level -ORinstance variable A variable can only be accessed in certain areas of your code, based on how and where you declare it. What is this concept known as? scope Epic Test Review 29 Epic Test Review 30 Epic Test Review 31 Epic Test Review 32 If I add two very large integers together, such that they exceed Integer.MAX_INT, what kind of problem do I have? With a line of code like this: int x = / I must be careful to avoid rounding errors. What kind of situation is this called? Adding two strings together using the + operator is known as what? concatenation Some strings use special symbols, such as: \n \t \\ \ Overflow Arthimatic Overflow Mixed-Mode arithmetic What term describes these symbols? Escape characters Escape sequences
5 Epic Test Review 33 Epic Test Review 34 Epic Test Review 35 Epic Test Review 36 What method do you call to find out how many characters are in a String? Length() You can t name your variables void, throw, break, or many other special words. What are these words called? Reserved words -ORkeywords What class do you use when you need to get input from the console? Scanner Write a comment. // words /* words */ Epic Test Review 37 Epic Test Review 38 Epic Test Review 39 Epic Test Review 40 An error at compile time is likely due to a mistake in the grammar of the language. What kind of error is this called? Syntax Error An error during run-time is likely due to a mistake from the user or a programmer s thinking. What kind of error is this called? Logic Error When you have an error during run-time, usually the program will throw a special error code. What are these errors called? Exceptions Give an example of one common exception type NullPointerException FileNotFoundException ArrayOutOfBoundsException
6 Epic Test Review 41 Epic Test Review 42 Epic Test Review 43 Epic Test Review 44 Name two methods from the Math class. Random Max Min Sqrt Pow Abs What kind of loop is also known as a definite loop, because you know exactly when it is going to terminate. for loop What kind of loop is also known as an indefinite loop, because you cannot tell how many times it will execute. while loop What java keyword do you use in a method header to indicate that it does not return any value? void Epic Test Review 45 Epic Test Review 46 Epic Test Review 47 Epic Test Review 48 Write a method header for a method named IsHappy that returns true or false. boolean ishappy() Note: If they include static or an access specifier like public, that s fine but not required. Declare an integer variable named x and initialize it to 5. int x = 5; -ORint x; x= 5; Given a double named d and an integer named i, write a line of code that casts d to an integer and assigns it to i. i = (int) d; When you cast a decimal value to an integer, how does its value change? It is truncated The decimal places are cut off (They must be clear that it is NOT rounded up, ever)
7 Epic Test Review 49 Epic Test Review 50 Epic Test Review 51 Epic Test Review 52 Write a line of code declaring and initializing an array of integers named arr of length 5. int[] arr = new int[5]; Write a line of code declaring and initializing a two dimensional array of characters named arr of length 7. char[][] arr = new char[7]; Write a segment of code that prints all the values in an array named arr. for(int x = 0; x < arr.length; x++) { System.out.println(arr[x]); Write a segment of code that assigns the value 42 to all elements of the integer array arr. for(int x = 0; x < arr.length; x++) { arr[x] = 42; Epic Test Review 53 Epic Test Review 54 Epic Test Review 55 Epic Test Review 56 Write a line of code that will return the 5 th row and 2 nd column of a two dimensional array named arr. return arr[4][1]; Explain one advantage of an ArrayList over an array. ArrayLists can change their size. ArrayLists offer useful methods, like clear() I can t use int or char in an ArrayList. What types would I need to use instead? Integer and Character The classes Integer and Character are Object versions of primitives, allowing them to be used in ArrayLists. What term is used to describe these kind of classes? ArrayLists allow the user to insert elements in the middle. Wrapper Classes
8 Epic Test Review 57 Epic Test Review 58 Epic Test Review 59 Epic Test Review 60 What method do you use to get the number of elements in an ArrayList? size() Name six examples of primitive data types. Boolean Bye Short Long Int Float Double Char Name two examples of objects from this class. Scanner String BlackKnight Limb QuizGame Hydra Robot What is the difference between an object and a class? An object is an instance of a class The class is the blueprint that defines what objects of that class are like. Epic Test Review 61 Epic Test Review 62 Epic Test Review 63 Epic Test Review 64 Methods and data can have four levels of access (we ve learned two). Name two of those access levels. Public Private Protected Package You should generally try to keep your data, but make your methods. Private data Public methods A method that builds an object and initializes its data is known as the. Constructor Write a constructor for a class named Robot that takes a String as a parameter. It should assign the passed value to a class-level String variable named name. Robot(String n) { name = n;
9 Epic Test Review 65 Epic Test Review 66 Epic Test Review 67 Epic Test Review 68 Write a class named Item. It should have a private String named n, and a public method to return its value called getname(). class Item { private String n; public String name() { return n; What do you call a method that does not modify the object, but simply returns a value. accessor What do you call a method that modifies an object, but does not return any data. mutator In Java, you don t need to worry about manually deleting objects or memory leaks. Why not? The garbage collector Epic Test Review 69 Epic Test Review 70 Epic Test Review 71 Epic Test Review 72 When you pass an object, you don t actually copy the object. What do you copy instead? The reference (or pointer) to a memory address. What method returns the number of characters in a String? length() What method do you use to get a single character from a String? charat() What is the airspeed velocity of an unladen swallow? Is it an African or European Swallow?
10 Epic Test Review 73 Epic Test Review 74 Epic Test Review 75 Epic Test Review 76 What term do we use to describe the structure of reserved memory for a program where objects live? Given an ArrayList of Strings called words. Write a for each loop that prints every element of the ArrayList. How many interfaces can a class implement? As many as you want How many Superclasses can a Subclass have in Java? One The Heap for(string s : words) { System.out.println(s); Epic Test Review 77 Epic Test Review 78 Epic Test Review 79 Epic Test Review 80 How many Subclasses can a Superclass have? As many as you want What term do we use to describe the structure of reserved memory for a program where local variables and methods live? The stack When reading a file what do you need to surround the scanner with? Try - catch block What coding methodology focuses on quick releases, pair programming, and automated testing? Extreme programming
11 Epic Test Review 81 Epic Test Review 82 Epic Test Review 83 Epic Test Review 84 What describes a simple or trivial case in a recursive method where one simply returns a value? Base Case What is the case in which a method calls itself with a modified argument? Recursive Case When creating a program that calculates factorials what ought one use? Recursion This type of data structure is similar to waiting in line for the cashier. What is it called? Queue Epic Test Review 85 Epic Test Review 86 Epic Test Review 87 Epic Test Review 88 What library allows you to use exponents, random, and other operators? MathLibrary This data structure is last in first out, and features methods like push(), pop(), and peek(). Stack When I write a line of code such as: Robot r = new KimBot() What feature of the Java programming language am I using? What term is used to describe a subclass gaining access to a method from its parent class? Inheritance Polymorphism
12 Epic Test Review 89 Epic Test Review 90 Epic Test Review 91 Epic Test Review 92 When a program can't run due to syntax errors in the code what type of error is it? Compile-Time Error When a program stops or throws an exception due to a logical error, what type of error is it? Run-time Error What idea in Computer Science says it is important to keep our data private, and avoid linking our classes too much? Encapsulation If you don t catch an exception, you must it and how that the method that called you does so. Throw
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