CSE 110 Final Questions and Correct Answers

Which reserved word in Java is used to create an instance of a class ~~ new The relationship between a class and an object is best described as... ~~ objects are instances of classes Which of the following would not be considered an algorithm? pseudocode, shopping list, recipe, computer program ~~ a shopping list if x is an int where x = 1, what will x be after the following loop terminates? while (x 100) x *= 2; ~~ 128 Decide if the printed output will be true or false: Point pointA = new Point (0.0); Point pointB = new Point(0,0); Sln(point A == pointB); ~~ false A variable whose scope is restricted to the method where it was declared is known as a ~~ local variable for the following code, where x=0, what is the resulting value of x after the for-loop terminates? for (int i =0; i = 4; i++) x += i; ~~ 10 In Java, instantiation means ~~ creating a new object What is the output generated by the following code fragment: int n = 64; int j = 1; while ( j n) { j = 2 * j; } Sln("j: " + j); ~~ 64 What are the java non-primitive data types? ~~ String, Array, Classes What is a run-time error? ~~ An error that occurs when the computer is running, when a program does not contain any syntax errors, but the computer asks the program to do something the program cannot do. What is a logic error? ~~ Otherwise known as a bug, logic errors occur when the program compiles and runs, but does the wrong thing. The process of hiding object data and providing methods for data access is called ~~ encapsulation If you do not provide a constructor in a class, what will happen? ~~ The compiler will generate a constructor with no arguments You are creating a class named Employee. How do you declare a constructor for this class? ~~ public Employee() All instance variables should be declared as private, and most instance methods should be declared as public. True or false? ~~ True A constructor can have a different name than the class? True or false? ~~ False, a constructor must have the same name as the class A constructor is invoked when what keyword is used? ~~ new How do you declare a 2D array with 20 rows and 2 columns of the type integer? ~~ int [][] num = new int [20][2]; How do you display the value in the third row and fourth column of an array? ~~ Sln(arr[2][3]); It always goes row first, column second, always subtract one from each number. Why do we used an enhanced for loop? ~~ it is convenient for traversing all th