All quizes

Every CS quiz from semester

If method A calls method B, and method B calls method C, and method C calls method D, when method D finishes, what happens?

control is returned method

The process of breaking a problem down into smaller pieces is sometimes called __________.

the divide and computer method

Which type of method performs a task and sends a value back to the code that called it?

value returning

When you pass an argument to a method you should be sure that the argument's type is compatible with ________

the parameter variable data type

Methods are commonly used to:

Break a problem down into small manageable pieces

Given the following method, which of these method calls is **correct**?

public static void showProduct (int num1, double num2)

{

   int product;

   product = num1 \* (int)num2;

   System.out.println("The product is " + product);

}

showProduct(…)

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Given the following method header, which of these method calls is **incorrect**?

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public void displayValue(int x, int y)

displayValue(a,b);// where a is a long and b is an int

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A __________ type of method performs a task and then terminates.

void

Assume that the following method header is for a method in class A.

public void displayValue(int value)

Assume that the following code segments appear in another method, also in class A. Which contains a **correct** **call** to the displayValue method?

int x = 7;

dsiplayValue(x);

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A __________ is a part of a method that contains a collection of statements that are performed when the method is executed.

method body

What value will be returned from the following method?

public static int methodA()

{

   double a = 3.5 + 4.5;

   return a;

}

nothing, the code ha san error

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Which of the following is *not* a part of a method call?

return type

What value will be returned from the following method?

\
public static double methodA()

{

   double a = 3.5 + 4.5;

   return a;

}

8\.0

The lifetime of a method's local variable is __________.

only while the method is executing

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A parameter variable's scope (accessibility) is confined to __________.

the method in which the parameter is declared

\
Values that are sent into a method are called __________.

arguments

In the following code, System.out.println(num) is an example of __________.

\
double num = 5.4;

System.out.println(num);

a void method

Local variables __________.

are only visible to the method in which they are declared

Given the following method, which of these method calls is **correct**?

\
public static void showProduct (double num1, int num2)

{

   double product;

   product = num1 \* num2;

   System.out.println("The product is " + product);

}

showProduct(10.0, 4);

When an object, such as a String, is passed as an argument it is __________.

actually a reference to the object that is passed

Character literals are enclosed in \__________ and string literals are enclosed in \__________.

single quotes, double quotes

Which of the following is NOT a rule that must be followed when naming identifiers?

identifiers can contain space

What is the result of the following Java expression? 4 + 3 - 2 * 20

-33

What is the result of the following Java expression? 23 % 3

2

What is the result of the following Java expression? 25 / 10

2

In Java, \__________ must be declared before they can be used.

variables

A Java source file must be saved with the extension

.java

A variable of type boolean data may contain which of the following range of values?

true and false

Which of the following is a value that is written into the code of a program?

a literal

Which of the following files would contain the translated Java byte code for a program named Demo?

demo.class

Which of the following commands would you use to compile a program named First?

javac First.java

Which of the following is a named storage location in the computer's memory?

a variable

Variables are classified according to their

data types

Every Java application program must have

a method named main

If x has been declared a variable of type int, which of the following statements is NOT valid?

x\=2,000;

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Given the following statement, which of the following expressions would be used to generate a value on a game die?

Random randomNumbers = new Random();

die = randomNumbers.nextInt(6) + 1;

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Which of the following statements opens a file named MyFile.txt and allows you to append data to its existing contents?

FileWriter fwriter = new FileWriter("MyFile.txt", true); \n PrintWriter outFile = new PrintWriter(fwriter);

Assume that inputFile references a Scanner object that was used to open a file.

Which of the following while loops is the correct way to read data from the file until the end of the file is reached?

while (inputFile.hasNext())

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Which of the following is the method you can use to determine whether a file exists?

the File class's exists method

Given the following statement, which statement will write "Calvin" to the file DiskFile.txt? \n \n PrintWriter diskOut = new PrintWriter("DiskFile.txt"); \n \n -System.out.println(diskOut, "Calvin"); \n -DiskFile.println("Calvin"); \n -PrintWriter.println("Calvin"); \n -diskOut.println("Calvin");

diskOut.println("Calvin");

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Given the following statement, which of the following expressions will generate a random number in the range of 1 through 10?

Random randomNumbers = new Random();

myNumber = randomNumbers.nextInt(10) + 1;

\
Which of the following statements opens a file named MyFile.txt and allows you to read data from it?

File file = new File("MyFile.txt"); \n Scanner inputFile = new Scanner(file);

\
When working with the PrintWriter class, which of the following import statements should you have near the top of your program?

import java.io.\*;

Assuming that inputFile references a Scanner object that was used to open a file, which of the following statements will read an int from the file?

int number = inputFile.readInt();

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Which of the following statements will create an object from the Random class?

Random myNumber = new Random();

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A(n) __________ is used as an index to pinpoint a specific element within an array.

subscript

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What would be the result after the following code is executed?

int\[\] x = {23, 55, 83, 19};

int\[\] y = {36, 78, 12, 24};

x = y;

y = x;

x\[\] = {36, 78, 12, 24} and y\[\] = {36, 78, 12, 24}

What will be the result after the following code is executed?

final int ARRAY_SIZE = 5;

double\[\] x = new double\[ARRAY_SIZE\];

for (int i = 1; i <  ARRAY_SIZE; i++)

{

     x\[i\] = 10.0;

   }

all values in the array except the first will be initialized to 10.0

What will be the value of x\[8\] after the following code is executed?

final int SUB = 12;

int\[\] x = new int\[SUB\];

int y = 100;

for(int i = 0; i < SUB; i++)

{

   x\[i\] = y;

   y += 10;

}

180

15\. What would be the result after the following code is executed?

final int SIZE = 25;

int\[\] ages = new int\[SIZE\];

... // Code that will put values in array

int value = 0;

for (int i = 0; i < ages.length; i++)

{

   value += ages\[i\];

}

value contains the sum of all values in array ages

For the following code, what would be the value of str\[2\]?

String\[\] str = {"abc", "def", "ghi", "jkl"};

a reference to the string object “ghi”

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When an ***individual element*** of an array is passed to a method __________.

none are true

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In memory, an array of String objects __________.

consists of an array of references to String objects

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Java performs ____________, which means that it does not allow a statement to use a subscript that is outside the range of valid subscripts for the array.

array bounds checking

\
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Given that String\[\] str has been initialized, to get a copy of str\[0\] with all the characters converted to uppercase, you would use the __________ statement.

str.\[0\].toUpperCase());

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What would be the result after the following code is executed?

int\[\] x = {23, 55, 83, 19};

int\[\] y = {36, 78, 12, 24};

for(int a = 0; a < x.length; a++)

{

   x\[a\] = y\[a\];

   y\[a\] = x\[a\];

}

`{36, 78, 12, 24}` and `y` will contain the values `{23, 55, 83, 19}`.

\
What will be the results after the following code is executed?

int\[\] ages = new int\[25\];

... // Code that will put values in ages

int value = ages\[0\];

for (int a = 1; a < ages.length; a++)

{

  if (ages\[a\] > value)

    value = ages\[a\];

}

value contains the highest value in ages

The __________ indicates the number of elements the array can hold

array’s size

What will be the results after the following code is executed?

int\[\] x = { 55, 33, 88, 22, 99, 11, 44, 66, 77 };

int a = 10;

if(x\[2\] > x\[5\])

   a = 5;

else

   a = 8;

a = 5

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An array’s subscripts always starts with __________.

0

What would be the result of executing the following code?

int\[\] x = {0, 1, 2, 3, 4, 5};

An array of 6 values ranging from 0 through 5 and referenced by the variable x will be created.

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What would be the result after the following code is executed?

int\[\] numbers = {40, 3, 5, 7, 8, 12, 10};

int value = numbers\[0\];

for (int i = 1; i < numbers.length; i++)

{

     if (numbers\[i\] < value)

          value = numbers\[i\];

}

The value variable will contain the lowest value in the numbers array.

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When an array's ***reference variable*** is passed to a method __________.

all of these are true

If final int SIZE = 15 and int\[\] x = new int\[SIZE\], what would be the range of subscript values that could be used with x\[\]?

0 through 14

Each array in Java has a public field named __________ that contains the number of elements in the array.

length

The CPU __________.

 job is to fetch instructions, follow the instructions, and produce some resulting data. 

Input devices are

The device that collects the data and sends it to the computer

* keyboard, scanner, mouse, digital camera

Output devices are

The data is sent to an output device, which formats and presents it.

* monitors and printers

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Which of the following will compile a program called ReadIt?

\
javac ReadIt.java

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Byte code instructions are

\
read and interpreted by the JVM

Variables are:

symbolic names made up by the programmer that represents locations in the computer's RAM

A computer program is:

a set of instructions that enable the computer to solve a problem or perform a task

Syntax is:

rules that must be followed when writing a program

______ refers to the physical components that a computer is made of.

hardware

RAM is

a volatile type of memory, used only for temporary storage.

Because Java byte code is the same on all computers, compiled Java programs

are highly portable

Key words are

These are words that have a special meaning in the programming language.

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A cross between human language and a programming language is called

pseudocode

Which of the following is not one of the major components of a typical computer system?

a. The CPU \n b. Input/ output devices \n c. Main memory \n d. Secondary storage devices \n e. All of these

All of these

Which of the following is not part of the programming process?

All these are parts of the programming process.