True/False
Indicate whether the
statement is true or false.
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1.
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Semantics consists of the rules for combining words into statements.
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2.
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When compared to natural languages, programming languages have large
vocabularies.
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3.
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To manipulate an object in Java a programmer will send the object a
message.
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4.
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Primitive data types must be instantiated before being used.
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5.
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Both the value of a variable and the type of data it contains can change during
execution of a program.
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6.
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It is illegal to declare several variables in a single declaration, i.e. int
a, b, c;
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7.
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The division statement of 10/4 will be evaluated to 2.
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8.
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User defined symbols are case sensitive in Java.
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9.
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The purpose of comments in a program is to document every line of code.
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10.
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Sending a message to a variable representing an object before it has been
instantiated causes a "null pointer exception".
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11.
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Inserting debugging output statements into code is a useful way to find syntax
errors.
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Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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12.
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What is the set of all the words and symbols in the Java programming
language?
a. | Program | c. | Syntax | b. | Vocabulary | d. | Semantics |
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13.
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Of the following, which is NOT a difference between natural languages and
programming languages?
a. | Size | c. | Literalness | b. | Semantics | d. | Rigidity |
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14.
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Which of the following is NOT a primitive data type in Java?
a. | integer | c. | boolean | b. | string | d. | character |
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15.
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How many bytes does the primitive data type double require?
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16.
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How many numeric data types does Java include?
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17.
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Which of the following is correct Java for writing exponential, or scientific
notation?
a. | 3.14 | c. | 5.124E5 | b. | 5 x 10 -1 | d. | none of the
above |
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18.
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Which keyword in Java declares a variable whose value cannot change?
a. | final | c. | constant | b. | const | d. | new |
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19.
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Which of the following operators has the highest precedence?
a. | Assignment ( = ) | c. | Method Selector ( . ) | b. | Unary Plus ( +
) | d. | Subtraction ( -
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20.
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The expression 3 + 2 * 5 - 1 yields:
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21.
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Which of the following mixed-mode arithmetic expressions yields 8.0?
a. | 5 / 2 * 4.0 | c. | 5.0 / 2 * 4 | b. | 5 / 2.0 * 4 | d. | 5.0 / 2.0 * 4 |
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22.
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What is the string concatenation operator?
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23.
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What string results from the expression "1 + 2 = " + 1 +
2
a. | "3 = 3" | c. | "1 + 2 = 12" | b. | "1 + 2 =
3" | d. | "3 =
12" |
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24.
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Which of the following is the escape sequence for a newline?
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25.
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Which String class method returns a string's length?
a. | size() | c. | stringLength() | b. | length() | d. | width() |
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26.
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What keyword indicates a method does not return a value?
a. | double | c. | void | b. | final | d. | null |
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27.
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Which of the following user-defined symbols is invalid?
a. | _name | c. | $income | b. | number3 | d. | 9innings |
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28.
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In the statement import x.y.z; what does the x
represent?
a. | the name of a class | c. | a variable | b. | a subsection of the package | d. | the name of the overall
package |
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29.
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Which type of error occurs when an instruction tries to divide by 0?
a. | Logic error | c. | Run-time error | b. | Syntax error | d. | No error |
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Completion
Complete each
statement.
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30.
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_____________ defines the rules for interpreting the meaning of
statements.
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31.
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A _________ is an item whose value can change during the execution of a
program.
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32.
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A programmer can collect a class or group of classes in a ____________.
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33.
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The KeyboardReader class method ______________ returns the entire input
line.
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34.
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A(n) _________ is a step-by-step procedure for solving a problem.
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35.
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_________ errors occur when the instruction does not do what was
intended.
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Short Answer
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36.
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Name four Java primitive data types.
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37.
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Give an example of a string literal and a floating point literal.
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38.
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Write a variable declaration statement for an integer value with the name
employeeNumber
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39.
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What does the modulus operator ( % ) yield?
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40.
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Casting the floating point number 3.8 to an integer using
(int)3.8, yields what value?
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41.
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What comprises a methods signature?
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42.
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Name the three types of programming errors.
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