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Self Test Answers
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7. Which statements correctly declare boolean variables A. Boolean isValid = true; B. boolean isValid = TRUE; C. boolean isValid = new Boolean (true); D. boolean isValid = 1; Answer:
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3 A and C. These statements properly declare boolean variables. Remember, the only valid literal values for the boolean primitives are true and false.
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B and D are incorrect. B is incorrect because TRUE is not a valid literal value. D is incorrect because you cannot assign the value 1 to a boolean variable. 8. Which of the following statements will not compile A. if (true) ; B. if (true) {} C. if (true) {:} D. if (true) {;} Answer:
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3 C . A colon is invalid by itself.
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A, B, and D are incorrect. All of the statements represent compilable code. 9. Given:
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public class Dinner { public static void main (String[] args) { boolean isKeeperFish = false; if (isKeeperFish = true) { System.out.println("Fish for dinner"); } else { System.out.println("Take out for dinner"); } } }
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What will be the result of the application s execution A. Fish for dinner will be printed. B. Take out for dinner will be printed. C. A compilation error will occur. Answer:
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3 A . Since only one equals sign (that is, assignment statement) was used in the if statement, the isKeeperFish variable was assigned the value of true.
and C are incorrect. B 10. The for loop has been enhanced in Java 5.0. Which is NOT a common term for the improved for loop. A. The for in loop B. The specialized for loop C. The for each loop D. The enhanced for loop Answer:
3 B . The enhanced for loop is not commonly referenced as a specialized for loop.
A, C, nd D are incorrect. The enhanced for loop is also commonly referenced as the a for in loop and the for each loop.
Implementing Statement-Related Algorithms from Pseudo-code
11. Given:
COUNTER := 1 WHILE COUNTER LESS THAN 10 PRINT COUNTER AND A NEW LINE COUNTER := COUNTER + 1 ENDWHILE
Self Test Answers
Which Java code segment implements the pseudo-code algorithm A. INT counter = 1; WHILE (counter < 10) { System.out.print(counter + "\n"); counter++; } B. int counter = 1; while {counter < 10} { System.out.print(counter + "\n"); counter++; } C. int counter = 1; while (counter < 10) { System.out.println(counter); counter++; } D. int counter = 1; while (counter < 10) { System.out.println(counter + "\n"); counter++; } Answer:
3 C. he answer implements the pseudo-code algorithm correctly. T
A, B,and D are incorrect. Answer A is incorrect because INT and WHILE are not Java keywords. B is incorrect because the expression for the while statement is enclosed in braces where parentheses are expected. D is incorrect because two new lines are printed, one with (\n) and one with the println method. 12. Given:
ISRECORD := FALSE FLOAT RECORD := 78.8 IF WEIGHT > RECORD THEN ISRECORD := TRUE ELSE ISRECORD := FALSE ENDIF
2:
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Which Java code segment implements the pseudo-code algorithm A. boolean isRecord = false float record = 78.8f if (weight > record) isRecord = true else isRecord = false B. boolean isRecord = false; float record = 78.8f; if (weight > record) isRecord = true; else isRecord = false; endif C. boolean isRecord = FALSE; float record = 78.8f; if (weight > record) isRecord = true; else isRecord = false; D. boolean isRecord = false; float record = 78.8f; if (weight > record) isRecord = true; else isRecord = false; Answer:
3 D . The answer implements the pseudo-code algorithm correctly.
A, B,and C are incorrect. A is incorrect because all of the required semicolons are missing. B is incorrect because the answer uses endif, which is not a Java keyword. Answer C is incorrect because the answer incorrectly uses FALSE. The only valid Java boolean literals are true and false.
Programming with Java Operators and Strings
CERTIFICATION OBJECTIVES
U nderstanding Fundamental Operators D eveloping with String Objects and Their Methods
Two-Minute Drill
Q&A Self Test
3:
Programming with Java Operators and Strings
wo of the most fundamental elements of the Java programming language are Java operators and strings. This chapter discusses Java operators and how they manipulate their operands.You will need a full understanding of the different types and groupings of operators to score well on the exam. This chapter provides you with all of the operator-related information you need to know. Strings are commonly used in Java, therefore they will also be present throughout the exam. This chapter details the String class and its related functionality. Topics include the string concatenation operator and the toString method, as well as a discussion of valuable methods straight from the String class. After completing this chapter, you will have all the knowledge necessary to score well on the operator- and string-related questions on the exam.
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