Exam
Name___________________________________
| TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. | ||
| 1) | All information is stored in the computer using binary numbers. | 1) ______ |
| 2) | Java is an object-oriented programming language. | 2) ______ |
| 3) | System.out.print is used in a program to denote that a comment follows. | 3) ______ |
| 4) | Java byte codes are directly executable whereas Java source code is not. | 4) ______ |
| 5) | The Java compiler is able to find all programmer errors. | 5) ______ |
| 6) | Java is a case-sensitive language meaning that Current, current, and CURRENT will all reference the same identifier. | 6) ______ |
| 7) | Code placed inside of comments will not be compiled and therefore will not execute. | 7) ______ |
| 8) | The word "Public" is a reserved word. | 8) ______ |
| 9) | Reserved words in Java can be redefined by the programmer to mean something other than their original intentions. | 9) ______ |
| 10) | In a Java program, dividing by 0 is a syntax error. | 10) ______ |
| 11) | Binary numbers are composed entirely of 0s and 1s. | 11) ______ |
| 12) | RAM is random access memory while ROM is not random access memory. | 12) ______ |
| 13) | Java is an example of a fourth generation language. | 13) ______ |
| 14) | The line of Java code "// System.out.println("Hello");" will cause "Hello" to be output. | 14) ______ |
| 15) | A unique aspect of Java that allows code compiled on one machine to be executed on a machine of a different hardware platform is Java's bytecodes. | 15) ______ |
| 16) | A Java compiler can determine if you have followed both proper syntax and semantics. | 16) ______ |
| 17) | A black and white picture can be stored by representing each pixel using a single bit. | 17) ______ |
| 18) | Mistyping "println" as "printn" will result in a run-time error. | 18) ______ |
| 19) | One terabyte is equivalent to approximately 1000 gigabytes. | 19) ______ |
| 20) | An operating system is considered software. | 20) ______ |
| 21) | Older computers store information in analog. | 21) ______ |
| 22) | Data written to a memory location overwrites and destroys any information that was stored at that location. | 22) ______ |
| 23) | If x is a string, then x = new String("OH"); and x = "OH"; will accomplish the same thing. | 23) ______ |
| 24) | Only difficult programming problems require a pseudocode solution before the programmer creates the implementation (program) itself. | 24) ______ |
| 25) | In Java, if and if-else are selection statements. | 25) ______ |
| 26) | In Java, the symbol "=" and the symbol "==" are used synonymously (interchangeably). | 26) ______ |
| 27) | When comparing any primitive type of variable, == should always be used to test to see if two values are equal. | 27) ______ |
| 28) | The statements x++; and ++x; will accomplish the same thing. | 28) ______ |
| 29) | The statement { } is a legal block. | 29) ______ |
| 30) | The statement if (a >= b) a++; else b--; will do the same thing as the statement if (a < b) b--; else a++;. | 30) ______ |
| 31) | An if statement may or may not have an else clause, but an else clause must be part of an if statement. | 31) ______ |
| 32) | In order to compare int and double variables, you can use <, >, ==, !=, <=, >=, but to compare char and String variables, you must use compareTo( ), equals( ) and equalsIgnoreCase( ). | 32) ______ |
|
For question(s) below, assume that boolean done = false, int x = 10, int y = 11, String s = "Help" and String t = "Goodbye". | ||
| 35) | The expression (!done && x <= y) is true. | 35) ______ |
| 36) | The expression (done | | s.compareTo(t) < 0) is true. | 36) ______ |
| 40) | The relational operators < and > can be used to tell whether one string comes before another alphabetically. | 40) ______ |
| 41) | The expression 'Z' < 'a' is true. | 41) ______ |
| 42) | The expression a || b will be true if either a or b is true, but not if both are true. | 42) ______ |
| 43) | The statement num -= num; will have the same result as the statement num = 0. | 43) ______ |
| 44) | If the integer variable answer is 5, then after answer %= 8; is executed, answer will be 3. | 44) ______ |
| 48) | If x is the String "Hi There", then x.toUpperCase().toLowerCase(); will return the original version of x. | 48) ______ |
| 49) | If String name = "George W. Bush"; then the instruction name.length(); will return 14. | 49) ______ |
| 50) | If String a = "ABCD" and String b = "abcd" then a.equals(b); returns false but a.equalsIgnoreCase(b); returns true. | 50) ______ |
| 51) | Unlike the String class where you must pass a message to an object (instance) of the class, as in x.length( ), in order to use the Math class, you pass messages directly to the class name, as in Math.abs( ). | 51) ______ |
| 52) | A double is wider than an int. | 52) ______ |
| 53) | A variable of type boolean will store either a 0 or a 1. | 53) ______ |
| 54) | In Java, 'a' and 'A' are considered to be different values. | 54) ______ |
| 55) | You cannot cast a String to be a char and you cannot cast a String which stores a number to be an int or double. | 55) ______ |
| 56) | If a, b and c are int variables with a = 5, b = 7, c = 12, then the statement int z = (a * b - c) / a; will result in z equal to 4. | 56) ______ |
| 57) | The mod operator, %, can only be performed on int values and its result is a double. | 57) ______ |
| 58) | The word println is a reserved word. | 58) ______ |
| 59) | A Java variable is the name of a data value stored in memory that can not change during the program's execution. | 59) ______ |
| 60) | If you want to use classes from a package other than java.lang, you must import them. | 60) ______ |
| 61) | The operators * and + have the same precedence. | 61) ______ |
| 62) | Since double to int is a narrowing conversion, there is no way to convert a double to an int. | 62) ______ |