CSCI21 - Java - Part 2 Exam Questions and Correct Answers Graded A+

CSCI21 - Java - Part 2 Exam Questions and Correct Answers Graded A+ final double EPSILON = 1E-14; if (M(x-y) <= EPSILON) - Answers To avoid round-off error when comparing float-point numbers, test whether the are close enough: write syntax reTo(t) < 0 - Answers Comparing Strings s comes before t in the dictionary no object - Answers null reference means? == - Answers what relational operator do you use to test for null boolean data type - Answers only two possible values: true and false, lowercase, reserved words in java && - Answers Logical operator for "and" || - Answers logical operator for "or" ! - Answers logical operator for unary not condition ? then-value; else-value - Answers syntax of the ? operator switch Statement - Answers what statement do we use whenever the conditions in an if-else chain are designed to check for constant values representing a finite number of cases countable - Answers switch-case statement switch(exp) exp must be "__________" primitive type (byte, int, car, NOT float or double) entry point - Answers case literal - serves as the " _______" for the case when exp==literal Loops - Answers are used to repeatedly execute a statement or a group of statements for (expr1; expr2; expr3) statement - Answers for statement syntax: initialization of setup - Answers expr1 in the for statement syntax (i=1) condition - Answers expr2 in the for statement syntax (i<=3) expr3 - Answers expr3 in the for statement syntax (i++) for statement - Answers deciding which one to use: most appropriate when the number of iterations isknown (e.g. factorial) at least once - Answers in a do-while statement, the loop body is executed checked first - Answers in a while statement, the condition is ________ _____ before executing Object composition or aggregation - Answers object Objects can be composed of other objects - Have references to "parts" of the class as fields of the class - Objects can create instances of other objects Encapsulation - Answers The idea of "hiding" implementation details