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Chapter 1

Chapter 1

Getting Started

This activity contains 15 questions.

	"Compatibility" regarding assignment statements means:   You may assign a byte to a double variable You may assign a short to a byte variable You may assign a float to a short variable You may assign a double to a long variable

	"Invoking a method" is sometimes called...   "receiving a message" "sending an object" "sending a message" "jumping to a subroutine"

	A constant or literal is an object whose value is determined from how it is "spelled." Which of the following are valid literals?   'Z', "testing, 1, 2, 3", 8x10e5 -14.92, 'a string of letters' 5, 17.4, 'c' true, -23.4509, "a string

	Java compiles into an intermediate language called byte-code. What is byte-code?   It's the machine language for Intel-class computers It's a collection of bytes of data It's 8 bits of coding It's the machine language for the Java Virtual Machine

	Java was developed at Sun Microsystems by James Gosling. It was introduced to the public in what year?   1990. 1989. 1995. 1999.

	System.out.println ("/* I love */ Java!"); will display:   Java! That's not legal Java -- nothing is displayed. /* I love */ Java! I love Java!

	The increment (++) and decrement (--) operators:   Only can be used to modify the values of variables containing integers -- like short, and it Can be used to modify the value of a string Can be used to modify the value of any numeric variable -- int, short, byte, float, double Can be used to modify the value of any numeric expression

	What does an "assignment statement" do?   It's much the same as an equation in algebra -- it makes a statement about the equality of the left- and right-sides of an equation It evaluates the expression on the "right hand side" and then saves this value in the variable on the "left hand side" It calculates a value, based on the expression that is given, and then assigns this value to the variable on the right of the equal sign It evaluates the expression on the "left hand side" and then saves this value in the variable on the "right hand side"

	What does it mean for the "preferred" type of integers to be int and the "preferred" type of floating point numbers to be double?   You should use int and double rather than short and float int and double are primitive types, while other forms of integers -- like short -- and other forms of floating point numbers -- like float -- are not If you combine different kinds of numbers, they'll all wind up becoming ints and doubles If you don't explicitly say differently, an integer will be assumed to be an int, and a floating point number will be assumed to be a double

	What is a syntax error?   An error that occurs during program execution A grammatical mistake, including misspelling, in a program An error in computation in the source code An error in the semantics of a program

	What is the function of the Java class loader?   It loads all the classes used by a Java program It compiles the Java source into classes It translates the Java classes into machine language It loads the data used by a Java program

	What is the result of saying: "abc" + 4 + 5 + "fgh"?   "abc45fgh" "abc4fgh5" Not a legal Java expression "abc9fgh"

	What statement is true about Java reserved words?   They are all in upper-case. They are all in lower-case. They can be in either upper-case or lower-case or mixed-case. They are case-independent.

	Which of the following is (are) true? Java's rules for using parentheses and precedence are about the same as those in algebra Java's rules for using parentheses are about the same as those in algebra; but, its precedence rules are quite different Java's rules for precedence are about the same as those in algebra; but, its rules for using parentheses are quite different Java's rules for using parentheses and precedence both are different from those in algebra   Only (d) Only (b) Only (a) Only (c)

	Which of the following statements are true? Every variable must be declared before it can be used Every variable must be given an initial value Variables can be used, even if they've not been declared, so long as they have an initial value A variable may be re-declared, if desired, but it loses its current value when this is done   Answers (a) and (d) Only (c) Answers (a) and (b) Only (a)

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