Section 1
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Java performs automatic garbage collection. True or False?
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Cards (246)
Section 1
(50 cards)
Java performs automatic garbage collection. True or False?
True
How do you create a single comment?
//
What is a software development environment?
is a set of tools used to create, organize, modify, test, and debug a program. It is software that helps you develop software.
Java is an object-oriented programming language. True or False?
True
What is the syntax of a language?
determines how words and symbols can be put together in valid ways.
The end-of-line block style aligns opening and closing braces vertically. True or False?
False
What is syntax coloring? A. Displaying each method of a program in a different color B. Wrapping program output in colored boxes C. Displaying program output in particular colors D. Showing certain elements of program code in different colors
D. Showing certain elements of program code in different colors
What is system.out sometimes referred to as?
The console window
The Java Development Kit (JDK) is an example of an integrated development environment (IDE). True or False?
False
What software tool is used to translate Java source code into Java bytecode? A. editor B. interpreter C. Java Virtual Machine (JVM) D. compiler
D. Compiler
What is an editor, a complier, and interpreter?
You modify and edit the code in the editor, the complier complies the code to make sure there are no errors, and an interpreter helps run the program.
How do you create a multi-line comment?
/* begins with */ ends with
When does a logic error occur?
when a program doesn't produce the desired results.
Java source code cannot be executed directly by a computer. True or False?
True
Java is a general-purpose programming language. True or False?
True
In a programming language, a syntactically valid statement has only one meaning. True or False?
True
What is the semantics of a language?
provide the meaning.
Which of the following statements is true? A. The body of a Java class is enclosed in square brackets: [ ] B. Blank lines in a Java program will be displayed in the output. C. The body of a Java method is enclosed in curly braces: { } D. The println method is called through the System.in object.
C. The body of a java method is enclosed in curly braces { }
What are three errors that you will determine when using java?
Syntax errors, Runtime errors, Logic errors
When does a runtime error occur?
while the program is executing and causes it to terminate abnormally. Ex: dividing by zero
When it comes to programming style, consistency is crucial. True or False?
True
The main method of a Java program must have which of the following method headers? A. private abstract void main() B. public static int main() C. public abstract void main(String[] args) D. public static void main(String[] args)
D. Public static void main (String[] args)
What is an overloaded operator?
An operator that performs multiple types of operations
What is the "+" symbol used for?
To perform string concatenation
A comment in a Java program is ignored by the compiler. True or False?
True
What is a natural language? A. A programming language that uses English-like terms. B. A programming language that feels natural to the user. C. A language used to describe algorithms. D. A language that humans use to communicate, such as English.
D. A language that humans use to communicate, such as English
The slogan "Write Once, Run Anywhere" is used to promote what? A. The Java Development Kit (JDK) B. Java's robust error handling C. Java's cross-platform benefits D. The Eclipse development environment
C. Java's cross-platform benefits
What output does the following code produce? System.out.print("Total: " + 100 + 20);
Total: 10020
What issue must be addressed when printing a long character string? A. The println method has a maximum number of characters it can accept. B. The string must be subdivided into sections of 50 characters or less. C. The print method cannot print character strings. D. A character string literal cannot span across multiple lines.
D. A character string literal cannot span across multiple lines
What is method overloading?
A technique that allows a method to accept different parameters
The Java Virtual Machine is software. True or False?
True
Java was created by a development team led by James Gosling. True or False?
True
Sun Microsystems was purchased by?
Oracle - 2010
What does the following line of code do? System.out.println("Your age in 7 years: " + (19 + 7)); A. Prints the string, moves to a new line, then prints the sum of 19 and 7. B. Prints the string, then adds the numbers and prints the result. C. Adds 19 to 7, concatenates the result to the string, then prints it. D. Concatenates 19 to the string, then concatenates 7 to the string, then prints it.
C. Adds 19 to 7, concatenates the result to the string, then prints it.
What were some of the features promoted by JAVA?
Platform Independence, Applets, Object Orientation, Garbage Collection
What result is printed by the following code? System.out.println(15 + 30);
45
What is the main method?
Is a special method that's called automatically when a Java program is executed
What is testing?
is the process of evaluating your program with the goal of discovering errors.
A typical Java compiler produces which type of output? A. Java source code B. Unicode C. JDK code D. Java bytecode
D. Java Bytecode
What is the method header?
The first line of the method ex: public static void
Which of the following statements is true? A. The println statement is a call to a method. B. The println statement sends text output to the editor. C. A println statement must be the first statement in a Java program. D. The name println is pronounced "print long."
A. The println statement is a call to method
What is a program specification?
is a set of requirements that must be satisfied by a program
What is the difference between print and println?
Print prints the statement on the same line, and println completely prints a statement to another line
What output does the following code produce? System.out.print("apple"); System.out.println("banana"); System.out.println("orange");
Applebanana orange
Java programs cannot be run on a web page. True or False?
False
What is debugging?
When you determine you have an error and must figure out how to fix your error
What is the syntax of a language? A. The rules that determine how words and symbols can be combined. B. A specification that lists a program's requirements. C. A list of errors that can occur in a program. D. The meaning of a language element.
A. The rules that determine how words and symbols can be combined.
A multi-line Java comment begins with a double slash (//). True or False?
False
What does the term case sensitive mean? A. The difference between upper-case and lower-case letters matters. B. A Java program is enclosed in, and executed relative to, a program case. C. Each case of a Java println statement must be unique. D. A Java program must be encased in a human-readable comment.
A. The difference between upper-case and lower-case letter matters
Java throws an ________ when a runtime error occurs?
exception
Section 2
(50 cards)
What is an identifier?
A name you make up when writing a program ex: names of variables, methods, and classes
The byte data type represents a true or false value. True or False?
False
Which of the following will produce a runtime error? A. Misspelling a word in the output. B. Dividing by zero. C. Computing the wrong answer. D. Omitting a necessary semicolon in a program.
B. Dividing by zero
What is a programming convention?
A convention is a guideline that programmers have agreed to follow regarding names, spacing, and other issues related to program style. Conventions are not part of the official language, but they make the code much easier to read
What is the input and output?
Input: keyboard, mouse, joystick Output: screen, printer, speakers Both: Pendrive, CD, Webcam, fax, touch screen
What are the 5 parts of the von Neumann architecture?
control unit, arithmetic logic unit, memory, input and output.
Classes in the Java API are organized into packages. True or False?
True
Which of the following is NOT a valid Java identifier? A. place1 B. 1stPlace C. first_place D. FIRST_PLACE
B. 1stPlace - cannot begin with a number
The float and long data types both represent floating-point values. True or False?
False - float and double represent floating
What package is the string apart of?
Java.lang
What is a program?
A step by step series of instructions that tells the hardware what to do
What is the arithmetic logic unit?
is the brain of a computer system. Within its main processor called the central processing unit (CPU), it performs mathematical, logic and comparison operations.
What package is the random and scanner apart of?
java.util
What is the Java API? A. A large library of classes B. A set of data conversion techniques C. A set of program testing routines D. A graphical interface to a Java program
A. a large library of classes
A numeric literal is an explicit number used in a program. True or False?
True
What does a variable declaration do?
It establishes the variable's name and the data type ex: int count
Internally, an upper-case letter ('A') is treated the same as its lower-case version ('a'). True or False?
False
Which of the following is NOT a Java primitive type? A. boolean B. double C. int D. number
D. number
Characters in Java are represented using the ASCII character set. True or False?
False - uses unicode
The term hertz can be used to describe a computer's speed. True or False?
True
A program that runs without generating a runtime error will produce correct results. True or False?
False - could produce incorrect results
What is debugging? A. The process of evaluating a program to discover errors. B. The process of translating a program into a valid executable version. C. The process of mapping programming language syntax to semantics. D. The process of determining the root cause of a problem and fixing it.
D. The process of determining the root cause of a problem and fixing it
The int and short data types both represent integers. True or False?
True
What are the 8 primitive data types?
4 integer: byte, short, int, long, 2 floating: float, double 1 character: char 1 boolean: boolean (True or False)
Numeric primitive values in Java are signed. True or False?
True - either positive or negative
What is computer architecture?
the design of a computer system that shows how all of the hardware elements are hooked together and exchange information via a set of wires called a bus.
What does an import statement do? A. Puts a class into a package. B. Reads data from an input source. C. Merges the separate elements of a program into one unit. D. Identifies the package in which a class can be found.
D. Identifies the package in which a class can be found. - An import statement helps the compiler resolve the references you make to a class in your code.
What does a double and floating hold for size?
float = 32 double = 64
What is the control unit?
is the heart of a computer system. It orchestrates the execution of computer programs by managing the cycle which controls the execution of instructions. It also coordinates the interactions of other components of the system.
Using the Java API in a program is a rare occurrence. True or False?
False
What is an assignment statement and assignment operator?
Assignment operator is = Assignment statement stores a value in a variable ex: length = 42; variable = expression
Which of the following identifiers follows the convention for naming Java variables? A. TotalValue B. total_value C. totalValue D. TOTALVALUE
C. totalValue
What are the steps in the instruction cycle?
1. Fetch 2. Decode 3. Execute 4. Store
What is a variable?
a name used to refer to a data value or an object.
What is the standard class library for Java called?
Java API - application programming interface
John von Neumann is known for the observation that the number of transistors that fit on a computer chip doubles every year. True or False?
False
What size can a byte, short, int, and long hold?
Byte = 8 Short = 16 Int = 32 Long = 64
There are exactly six primitive data types in Java. True or False?
False - 8
What components are part of the von Neumann model? A. control unit, arithmetic logic unit, memory, input and output B. flash memory, hard disks and network storage C. keyboard, mouse, touchscreen and joystick D. fetch, decode, execute and store E. hardware, software, data and programs
A. control unit, arithmetic logic unit, memory, input and output
The assignment operator has higher precedence than the arithmetic operators. True or False?
False
Which of the following is NOT a valid variable declaration in Java? A. double total; B. String greeting = "Hi there!"; C. float height = 20.0, length = 30.5; D. int first = true;
D. int first = true;
If the compiler produces errors, it will not generate an executable version of the program. True or False?
True
Full documentation about the Java API can be found online. True or False?
True
A widening conversion converts a primitive value to a larger primitive type. True or False?
True
Which of the following will produce a syntax error? A. Misspelling a word in the output. B. Computing the wrong answer. C. Dividing by zero. D. Omitting a necessary semicolon in a program.
D. Omitting a necessary semicolon in a program
What is the memory unit?
is made up of a main data storage area called random access memory (RAM) and other memory components that are responsible for storing and retrieving program data and instructions.
Information in secondary memory is lost if the power is turned off. True or False?
False - Secondary memory like a hard drive is nonvolitile, meaning it retains its information when power is lost.
A type cast is used to change the data type of a variable. True or False?
False
What are the two categories of data types in Java? A. integers and character strings B. objects and character strings C. primitive data and object references D. numbers and characters
C. primitive data and object references
What does hardware refer to?
refers to the physical components, such as the monitor, mouse, keyboard, disk drives and system circuit boards which include the main processor, memory, graphics processor, and sound card
Section 3
(50 cards)
A constant is created using the final modifier. True or False?
True - The value of a variable declared with the final modifier cannot be changed.
Which line of code is equivalent to the following? depth += 50 * offset; A. depth = depth + (50 * offset); B. offset = depth + (50 * offset); C. offset = depth + 50 * offset; D. depth = (depth + 50) * offset;
A. depth = depth + (50 * offset);
What value is assigned to the integer variable num by the following statement if the current value of num is 4? num = num * 2; A. 2 B. 4 C. 6 D. 8
D. 8
The field width in a printf format specifier determines the total number of characters to be used to print the value. True or False
True
If the current value of the integer variable num1 is 2 and the current value of the double variable num2 is 3.0, what value will be stored in num2 after the following line of code is executed? num2 /= num1 * num2; A. 0.0 B. 0.5 C. 1.0 D. 1.5
B. 0.5
What does the increment operator do?
++ increments by 1
If either or both operands to the division operator (/) are floating-point values, then the result will be a floating-point value. True or False?
True - And if both are integers, it performs integer division.
If the current value of the integer variable num is 4, what value will be stored in num after the following line of code is executed? num += 2; A. 2 B. 4 C. 6 D. 8
C. 6
The Math.PI constant represents pi to 15 decimal places. True or False
True
A printf format specifier of %.3f will print a floating-point value truncated to 3 decimal places. True or False
False -The value is rounded, not truncated.
What is the result of the expression Math.max(6, 17)? A. 0 B. 6 C. 17 D. 23
C. 17
What will happen if the variable total holds 5 when the following code is executed? if (total > 8) System.out.println("collywobbles"); A. The word collywobbles is not printed and an exception is thrown. B. The word collywobbles is not printed, but an error message is. C. The word collywobbles is printed and then processing continues. D. The word collywobbles is not printed and processing continues.
D.The word collywobbles is not printed and processing continues.
The first parameter to the printf method is the format string. True or False
True
When is an if statement used?
used to decide which programming statement to execute next. That is, it determines if it will execute the statement(s) in the body of the if statement, or if it will skip it and continue
What output is printed by the following code if it is executed when appetizer is 3 and entree is 12? if (appetizer > 1) if (entree < 7) System.out.println("ketchup"); else System.out.println("mustard"); else if (appetizer < 0) System.out.println("mayonnaise"); else System.out.println("relish"); A. ketchup B. mustard C. mayonnaise D. relish E. salsa F. None of the above
B. Mustard
Why do we use constants?
1. Constants convey more meaning than literals. 2. They prevent inadvertent programming errors. 3. They make maintenance tasks easier and safer.
If both operands to the remainder operator (%) are positive, a divisor of n will produce a result in the range 1 to n. True or False?
False - It will produce a result in the range 0 to n-1.
What is a boolean expression?
True or false expression that evaluates
Which of the following is NOT a constant declared in the Java API? A. Integer.MAX_VALUE B. Conversions.KILOMETERS_PER_MILE C. Math.E D. Math.PI
B. Conversions.KILOMETERS_PER_MILE -There is no such constant in the Java API (and no class called Conversions for that matter).
What happens to the current value of the integer variable size when the following statement is executed? size = 12; A. Nothing. This will cause a syntax error. B. The current value is stored in the next available memory location. C. The current value is overwritten by the new value. D. There can be no current value in size.
C. The current value is overwritten by the new value.
If the variable num contains a positive integer, what are the only two possible results of the following expression? num % 2 A. 0 and 1 B. 1 and 2 C. -1 and 1 D. 0 and 2
A. 0 and 1 - 2 either divides the number evenly or there is 1 left over.
Suppose the integer variable hours contains a value that represents a number of hours. Which of the following expressions will compute how many 24-hour periods are represented by that value, without worrying about any leftover hours. A. hours / 24 B. hours % 24 C. hours / 24 + 1 D. hours % 24 + 1
A. hours / 24
A runtime error occurs when a printf field width is insufficient to display a value. True or False
False
The Math class contains a constant that represents the value pi to several digits. True or False?
True
The methods of the Math class are called through the class name because they are abstract. True or False
False - They are called through the class because the methods are static.
What does this % mean?
remainder
Constants make maintenance tasks easier. True or False?
True
Given the following declarations, which assignment statement would cause the compiler to issue an error? int num1 = 5, num2 = 3500; double num3 = 7.29; A. num2 = num3; B. num3 = num2; C. num2 = num1; D. num3 = num1;
A. num2 = num3 - A double value cannot be assigned to an integer variable without a cast.
If the current value of the integer variable size is 2, what value will be stored in size after the following line of code is executed? size *= 3; A. 2 B. 3 C. 5 D. 6
D. 6
Java constants cannot be created for floating-point values. True or False?
False - You can make a constant out of any data type in Java.
The expression x^y raises the value x to the power y. True or False?
False
What does the decrement operator do?
-- decrements by 1
The result of a relational operator can be assigned to a boolean variable. True or False
True
Of the options given, what values of the variables height, size, and width would cause the following code to set the variable weight to 100? if (height < size) { weight = 50; if (width < 20) System.out.println("short"); } else { if (width > 100) weight = 100; System.out.println("tall"); } A. height = 12, size = 20, width = 200 B. height = 15, size = 25, width = 50 C. height = 20, size = 12, width = 90 D. height = 15, size = 10, width = 110
D.height = 15, size = 10, width = 110
What is the result of the expression Math.pow(3, 3)? A. 0 B. 6 C. 9 D. 27
D. 27
What is wrong with the following code? if (count > 5) if (sum < MAX) System.out.println("cattywampus"); else System.out.println("snickersnee"); A. One output statement can never be executed. B. A second else clause is required. C. The indentation does not properly reflect the processing. D. It contains at least one invalid condition.
C.The indentation does not properly reflect the processing.
The arithmetic operators have a lower precedence than the relational operators. True or False
False
The format method of the String class accepts the same parameters as the printf method. True or False
True
If the current value of the integer variable count is 2, what value will be stored in count after the following line of code is executed? count += count * 3; A. 2 B. 3 C. 6 D. 8
D. 8
What is the result of the following Java expression? 7 / 2 A. 0 B. 1 C. 3 D. 3.5
C. 3
A printf format specifier changes the value in the corresponding parameter. True or False
False
A constant should not be declared with public visibility True or False?
False -It's ok for a constant to be public because it's value cannot be changed.
The printf method accepts a variable number of parameters. True or False
True
What is the result of the expression Math.floor(12.843)? A. 0 B. 10.0 C. 12.0 D. 13.0
C. 12.0
If both operands to the remainder operator (%) are positive, a divisor of n will produce a result in the range 1 to n. True or False?
False
Which of the following identifiers follow the naming convention for a Java constant? A. Max_Penalties B. MAX_PENALTIES C. MAXPENALTIES D. maxPenalties
B. MAX_PENALITIES - Java constants should be in all upper case letters with underscores between words.
The expression count++ can stand as a statement on its own. True or False?
True
What is the result of the following Java expression? 43 % 5 A. 3 B. 4 C. 8 D. 8.6
A. 3 is leftover
What is the result of the expression Math.round(8.25)? A. 8 B. 9 C. 8.2 D. 8.3
A. 8
Which of the following statements is true? A. An if statement is an example of a repetition statement. B. The body of an if statement must be enclosed in braces. C. The condition of an if statement must be a boolean expression. D. An if statement must contain an else clause.
C. The condition of an if statement must be a boolean expression
Section 4
(50 cards)
An import statement should be written inside a class but before any methods. True or False
False - should be written above the class
If A and B are both false, then the expression A && B is false. True or False
True
Which statement would produce the following output?
Eeny
Meeny
Miny
Moe
A. System.out.println("Eeny
\tMeeny
Miny
\tMoe");
B. System.out.println("Eeny\t
Meeny\tMiny\t
Moe");
C.
System.out.println("Eeny\t\tMeeny\tMiny\t\tMoe");
D. System.out.println("Eeny
\tMeeny
\tMiny
\tMoe");
A. System.out.println("Eeny
\tMeeny
Miny
\tMoe"); - \t is a horizontal tab and
is a newline charcter (which sends the output to the next line).
In a program, a class must always be referred to using its fully qualified name. True or False
False - The import statement allows us to avoid always using the fully qualified name.
The Java keyword new is a method that can be called to create objects. True or False
False - The keyword new is an operator, not a method.
What output would be produced when the following code is executed? String state = "Mississippi"; System.out.println(state.replace("is", "was")); A. Mwasswasswaspi B. Mwaswasippi C. Mwasswassippi D. Mwassissippi
C. Mwasswassippi
The classes of the java.util package are automatically imported into every Java program. True or False
False - The only package automatically imported is java.lang
A String method can be called through a string literal. True or False
True - This is fine since a string literal represents the object.
A static import let's you refer to a static method without using its class name. True or False
True - Though it may mask the source of the method.
An entire package can be imported using one import statement. True or False
True - Using the wildcard * character.
When reading input using a Scanner object, if the type of input does not match the expected type, the compiler will issue an error message. True or False
False - This type of problem cannot be detected during compilation. It is a runtime error.
A method declaration includes parentheses after the method name, even if the method takes no parameters. True or False
True -That's how the compiler knows you're declaring a method.
An object must be created when its object reference variable is declared. True or False
False - can be separate activities
A String object cannot be created with a new operator. True or False
False - You can use the new operator, but often a string literal will suffice.
A constructor of a class has the same name as the class. True or False
True - It is called when the object is created.
What does the ^ result produce?
Will be false if there are 2 false statements or true if one is true. But if both are true then false
If A is true and B is false, then the expression A || B is true. True or False
True
Which statement would produce the following output?
"Oom Pah Pah Oom Pah Pah," that's how it goes.
A. System.out.println("
Oom Pah Pah Oom Pah Pah,
that's how it goes.");
B. System.out.println("\qOom Pah Pah Oom Pah Pah,\q that's how it goes.");
C. System.out.println(""Oom Pah Pah Oom Pah Pah," that's how it goes.");
D. System.out.println("\"Oom Pah Pah Oom Pah Pah,\" that's how it goes.");
D. System.out.println("\"Oom Pah Pah Oom Pah Pah,\" that's how it goes."); - The \" escape sequences are needed to print the quotation marks.
What operator is used to perform string concatenation in Java? A. + B. & C. * D. @
A. +
When reading input using a Scanner object, each input value must be on its own line. True or False
False - Depending on what types of values are being read, they might be on the same input line.
The String class is part of the java.util package. True or False
False - apart of the java.lang
The return type of a method must either be a Java primitive type or void. True or False
False - A method could also return an object.
It is usually not a good idea to explicitly return a true or false literal value in a method that returns a boolean. True or False
True - It's better to return the boolean expression, which evaluates to true or false.
If A is false, then the B operand in the expression A || B is not evaluated. True or False
False - Since A is false, the truth value of an || expression won't be known until B is evaluated
When a method is called, the type and value of each argument are included in parentheses. True or False
False -The types of the arguments are only included in the method declaration, not when calling it.
What are the four boolean operators?
! - not && - and || - or ^ - exclusive or
What is a backlash character? \
which is sometimes called the escape character. When the compiler encounters a backslash character in a string literal, it knows to treat what follows in a special manner. The idea is that when the backslash is encountered we are breaking away, or escaping, from the standard meaning.
What should you pass to the Scanner constructor if you want to create a Scanner object that reads input typed at the keyboard. A. System.in B. Console.out C. Keyboard.in D. System.out
A. System.in - It represents the standard input stream.
A variable can be declared inside the body of a method. True or False
True - Such variables are local data, and cease to exist when the method returns.
If the type of the expression in a return statement does not match the return type of the method, the compiler will issue an error message. True or False
True - The method's return type and the type of the value returned must match.
An import statement tells the compiler which class you're referring to in a program. True or False
True - The package and class names together uniquely identify the class
Given the following declaration, which expression would produce the substring "ledge"? String words = "Knowledge is power."; A. words.substring(4, 9); B. words.substring(5, 10); C. words.substring(4, 8); D. words.substring(5, 9)
A. words.substring(4, 9); - start at 0!
The next and nextLine methods of the Scanner class both read and return character strings. True or False
True - They differ by how much text is read.
The exclusive or operator (^) produces results that are opposite to the regular or operator (||). True or False
False - only different when there both are true
What does the && result produce?
Will only be true if both variables are true
What does the || result produce?
Will only be true if one of the variables is true.
What is the output of the following statement? System.out.println("He said \"Avada Kedavra\""); A. He said \\"Avada Kedavra\\" B. He said \"Avada Kedavra\" C. He said "Avada Kedavra" D. He said 'Avada Kedavra' E. No output. This statement contains a syntax error.
C. He said "Avada Kedavra"
A method that has a return type of void does not have to have a return statement. True or False
True - The method automatically returns when the end of the method body is reached.
If a String variable called greeting contains the characters "hello", what does the following expression do? greeting.toUpperCase() A. Returns a new string containing the characters "Hello" B. Converts the characters in the greeting object to "Hello". C. Returns a new string containing the characters "HELLO" D. Converts the characters in the greeting object to "HELLO".
C. Returns a new string containing the characters "HELLO"
What do the characters in a Unicode escape sequence represent? A. The hexadecimal code for a particular Unicode character B. the ASCII code for the equivalent Unicode character C. a range of Unicode characters D. the set of characters terminating in a particular Unicode character
A. The hexadecimal code for a particular Unicode character - They are the code of a single character expressed as a hexadecimal number.
Two classes can have the same name if they are in different packages. True or False
True - That way each class name doesn't have to be unique
The less than operator (<) should not be used to compare floating-point values. True or False
False
The relational operators can be used to put String objects in alphabetical order. True or False
False
The not operator (!) requires two operands. True or False
False - only one (Unary)
Which of the following literals is NOT valid?
A. '
'
B. '"'
C. "\"
"
D. ""
""
D. ""
"" -This is not valid because the double quotes inside the string literal must be represented using escape sequences.
If a String variable called pioneer contains the characters "Grace Murray Hopper", what is the result of the following expression? pioneer.length() A. 17 B. 18 C. 19 D. 20
C. 19 - count spaces! start at 1
By default, what characters are used to separate input tokens when reading input using a Scanner object? A. spaces, tabs, and newline characters B. colons C. semicolons D. periods
A. spaces, tabs, and newline characters - Collectively, they are called white space.
What does
do?
creates a new line
ex: (Batman
Robin);
Batman
Robin
If a String variable called address contains the characters "123 Main Street", what is the result of the following expression? address.indexOf('3') A. -1 B. 2 C. 3 D. That expression would cause an error.
B. 2 - character 3 is at number 2 because start at 0
Attempting to follow a null reference will cause an exception to be thrown. True or False
True -
Section 5
(46 cards)