Question 1

Which flag in a format specifier indicates that values with fewer digits than the field width should begin with a leading 0?

Accepted Answer

A) p. 
B) l. 
C) w. 
D) 0. 
A) p. 
B) l. 
C) w. 
D) 0. D

Question 2

Class ________ represents a dynamically resizable array-like data structure.

Accepted Answer

A) Array. 
B) ArrayList. 
C) Arrays. 
D) None of the above. 
A) Array. 
B) ArrayList. 
C) Arrays. 
D) None of the above. B

Question 3

Which method sets the background color of a JPanel?

Accepted Answer

A) setBack. 
B) setBackground. 
C) setBackgroundColor. 
D) setColor. 
A) setBack. 
B) setBackground. 
C) setBackgroundColor. 
D) setColor. B

Question 4

Arrays are:

Accepted Answer

A) variable-length entities. 
B) fixed-length entities. 
C) data structures that contain up to 10 related data items. 
D) used to draw a sequence of lines,or "rays." 
A) variable-length entities. 
B) fixed-length entities. 
C) data structures that contain up to 10 related data items. 
D) used to draw a sequence of lines,or "rays."

Question 5

In this question,assume a class,Book,has been defined.Which set of statements creates an array of Book objects?

Accepted Answer

A) Book[] books; books = new Book[ numberElements ]; 
B) Book[] books]; books = new Book()[ numberElements ]; 
C) new Book()books[]; books = new Book[ numberElements ]; 
D) All of the above. 
A) Book[] books; books = new Book[ numberElements ]; 
B) Book[] books]; books = new Book()[ numberElements ]; 
C) new Book()books[]; books = new Book[ numberElements ]; 
D) All of the above.

Question 6

Which of the following is false?

Accepted Answer

A) The size of an ArrayList can be determined via its length instance variable. 
B) The size of an ArrayList can be determined via its size method. 
C) You can add a new item to the end of an ArrayList with its add method. 
D) You can get an item from a specified index in an ArrayList with its get method. 
A) The size of an ArrayList can be determined via its length instance variable. 
B) The size of an ArrayList can be determined via its size method. 
C) You can add a new item to the end of an ArrayList with its add method. 
D) You can get an item from a specified index in an ArrayList with its get method.

Question 7

Which of the following statements about creating arrays and initializing their elements is false?

Accepted Answer

A) The new keyword should be used to create an array. 
B) When an array is created,the number of elements must be placed in square brackets following the type of element being stored. 
C) The elements of an array of integers have a value of null before they are initialized. 
D) A for loop is commonly used to set the values of the elements of an array. 
A) The new keyword should be used to create an array. 
B) When an array is created,the number of elements must be placed in square brackets following the type of element being stored. 
C) The elements of an array of integers have a value of null before they are initialized. 
D) A for loop is commonly used to set the values of the elements of an array.

Question 8

Which method call converts the value in variable stringVariable to an integer?

Accepted Answer

A) Convert.toInt( stringVariable ). 
B) Convert.parseInt( stringVariable ). 
C) Integer.parseInt( stringVariable ). 
D) Integer.toInt( stringVariable ). 
A) Convert.toInt( stringVariable ). 
B) Convert.parseInt( stringVariable ). 
C) Integer.parseInt( stringVariable ). 
D) Integer.toInt( stringVariable ).

Question 9

What do the following statements do? double[] array;
Array = new double[ 14 ];

Accepted Answer

A) Create a double array containing 13 elements. 
B) Create a double array containing 14 elements. 
C) Create a double array containing 15 elements. 
D) Declare but do not create a double array. 
A) Create a double array containing 13 elements. 
B) Create a double array containing 14 elements. 
C) Create a double array containing 15 elements. 
D) Declare but do not create a double array.

Question 10

When an argument is passed by reference:

Accepted Answer

A) a copy of the argument's value is passed to the called method. 
B) changes to the argument do not affect the original variable's value in the caller. 
C) the called method can access the argument's value in the caller directly and modify that data. 
D) the original value is removed from memory. 
A) a copy of the argument's value is passed to the called method. 
B) changes to the argument do not affect the original variable's value in the caller. 
C) the called method can access the argument's value in the caller directly and modify that data. 
D) the original value is removed from memory.

Question 11

Which of the following sets of statements creates a multidimensional array with 3 rows,where the first row contains 1 value,the second row contains 4 items and the final row contains 2 items?

Accepted Answer

A) int[][] items; items = new int[ 3 ][ ? ];
Items[ 0 ] = new int[ 1 ];
Items[ 1 ] = new int[ 4 ];
Items[ 2 ] = new int[ 2 ]; 
B) int[][] items; items = new int[ 3 ][ ];
Items[ 0 ] = new int[ 1 ];
Items[ 1 ] = new int[ 4 ];
Items[ 2 ] = new int[ 2 ]; 
C) int[][] items; items = new int[ ? ][ ? ];
Items[ 0 ] = new int[ 1 ];
Items[ 1 ] = new int[ 4 ];
Items[ 2 ] = new int[ 2 ]; 
D) int[][] items; items[ 0 ] = new int[ 1 ];
Items[ 1 ] = new int[ 4 ];
Items[ 2 ] = new int[ 2 ]; 
A) int[][] items; items = new int[ 3 ][ ? ];
Items[ 0 ] = new int[ 1 ];
Items[ 1 ] = new int[ 4 ];
Items[ 2 ] = new int[ 2 ]; 
B) int[][] items; items = new int[ 3 ][ ];
Items[ 0 ] = new int[ 1 ];
Items[ 1 ] = new int[ 4 ];
Items[ 2 ] = new int[ 2 ]; 
C) int[][] items; items = new int[ ? ][ ? ];
Items[ 0 ] = new int[ 1 ];
Items[ 1 ] = new int[ 4 ];
Items[ 2 ] = new int[ 2 ]; 
D) int[][] items; items[ 0 ] = new int[ 1 ];
Items[ 1 ] = new int[ 4 ];
Items[ 2 ] = new int[ 2 ];

Question 12

What kind of application tests a class by creating an object of that class and calling the class's methods?

Accepted Answer

A) Pseudo application. 
B) Debugger. 
C) Tester. 
D) Test harness. 
A) Pseudo application. 
B) Debugger. 
C) Tester. 
D) Test harness.

Question 13

Which statement below initializes array items to contain 3 rows and 2 columns?

Accepted Answer

A) int[][] items = { { 2,4 },{ 6,8 },{ 10,12 } };. 
B) int[][] items = { { 2,6,10 },{ 4,8,12 } };. 
C) int[][] items = { 2,4 },{ 6,8 },{ 10,12 };. 
D) int[][] items = { 2,6,10 },{ 4,8,12 };. 
A) int[][] items = { { 2,4 },{ 6,8 },{ 10,12 } };. 
B) int[][] items = { { 2,6,10 },{ 4,8,12 } };. 
C) int[][] items = { 2,4 },{ 6,8 },{ 10,12 };. 
D) int[][] items = { 2,6,10 },{ 4,8,12 };.

Question 14

Constant variables also are called .

Accepted Answer

A) write-only variables. 
B) finals. 
C) named constants. 
D) All of the above. 
A) write-only variables. 
B) finals. 
C) named constants. 
D) All of the above.

Question 15

Which of the following statements creates a multidimensional array with 3 rows,where the first row contains 1 element,the second row contains 4 elements and the final row contains 2 elements?

Accepted Answer

A) int[][] items = { { 1,null,null,null },{ 2,3,4,5 },{ 6,7,null,null } };. 
B) int[][] items = { { 1 },{ 2,3,4,5 },{ 6,7 } };. 
C) int[][] items = { { 1 },{ 2,3,4,5 },{ 6,7 },{} );. 
D) int[][] items = { { 1 },{ 4 },{ 2 } };. 
A) int[][] items = { { 1,null,null,null },{ 2,3,4,5 },{ 6,7,null,null } };. 
B) int[][] items = { { 1 },{ 2,3,4,5 },{ 6,7 } };. 
C) int[][] items = { { 1 },{ 2,3,4,5 },{ 6,7 },{} );. 
D) int[][] items = { { 1 },{ 4 },{ 2 } };.

Question 16

In Java,multidimensional arrays:

Accepted Answer

A) are not directly supported. 
B) are implemented as arrays of arrays. 
C) are often used to represent tables of values. 
D) All of the above. 
A) are not directly supported. 
B) are implemented as arrays of arrays. 
C) are often used to represent tables of values. 
D) All of the above.

Question 17

Consider integer array values,which contains 5 elements.Which statements successfully swap the contents of the array at index 3 and index 4?

Accepted Answer

A) values[ 3 ] = values[ 4 ]; values[ 4 ] = values[ 3 ]; 
B) values[ 4 ] = values[ 3 ]; values[ 3 ] = values[ 4 ]; 
C) int temp = values[ 3 ]; values[ 3 ] = values[ 4 ];
Values[ 4 ] = temp; 
D) int temp = values[ 3 ]; values[ 3 ] = values[ 4 ];
Values[ 4 ] = values[ 3 ]; 
A) values[ 3 ] = values[ 4 ]; values[ 4 ] = values[ 3 ]; 
B) values[ 4 ] = values[ 3 ]; values[ 3 ] = values[ 4 ]; 
C) int temp = values[ 3 ]; values[ 3 ] = values[ 4 ];
Values[ 4 ] = temp; 
D) int temp = values[ 3 ]; values[ 3 ] = values[ 4 ];
Values[ 4 ] = values[ 3 ];

Question 18

Which of the following statements is false?

Accepted Answer

A) An exception indicates a problem that occurs while a program executes. 
B) Exception handling enables you to create fault-tolerant programs that can resolve (or handle)exceptions-in many cases,this allows a program to continue executing as if no problems were encountered. 
C) The catch block contains the code that might throw an exception,and the try block contains the code that handles the exception if one occurs. 
D) Inside the catch block,you can use the parameter's identifier to interact with a caught exception object. 
A) An exception indicates a problem that occurs while a program executes. 
B) Exception handling enables you to create fault-tolerant programs that can resolve (or handle)exceptions-in many cases,this allows a program to continue executing as if no problems were encountered. 
C) The catch block contains the code that might throw an exception,and the try block contains the code that handles the exception if one occurs. 
D) Inside the catch block,you can use the parameter's identifier to interact with a caught exception object.

Question 19

Assume array items contains the integer values 0,2,4,6 and 8.Which of the following set of statements uses the enhanced for loop to display each value in array items?

Accepted Answer

A) for ( int i = 0;i < items.length;i++ ) System.out.prinf( "%d
",items[ i ] ); 
B) for ( int i : items ) System.out.prinf( "%d
",items[ i ] ); 
C) for ( int i : items ) System.out.prinf( "%d
",i ); 
D) for ( int i = 0 : items.length ) System.out.prinf( "%d
",items[ i ] ); 
A) for ( int i = 0;i < items.length;i++ ) System.out.prinf( "%d
",items[ i ] ); 
B) for ( int i : items ) System.out.prinf( "%d
",items[ i ] ); 
C) for ( int i : items ) System.out.prinf( "%d
",i ); 
D) for ( int i = 0 : items.length ) System.out.prinf( "%d
",items[ i ] );

Question 20

Which of the following statements about an arc is false?

Accepted Answer

A) An arc is a section of an oval. 
B) The sweep is the amount of arc to cover. 
C) Method drawArc draws the edges of an arc. 
D) The fillArc method draws an oval,with the section that is an arc filled in. 
A) An arc is a section of an oval. 
B) The sweep is the amount of arc to cover. 
C) Method drawArc draws the edges of an arc. 
D) The fillArc method draws an oval,with the section that is an arc filled in.

Exam 7: Arrays and Arraylists

Which flag in a format specifier indicates that values with fewer digits than the field width should begin with a leading 0?

Class ________ represents a dynamically resizable array-like data structure.

Which method sets the background color of a JPanel?

Arrays are:

In this question,assume a class,Book,has been defined.Which set of statements creates an array of Book objects?

Which of the following is false?

Which of the following statements about creating arrays and initializing their elements is false?

Which method call converts the value in variable stringVariable to an integer?

What do the following statements do? double[] array; Array = new double[ 14 ];

When an argument is passed by reference:

Which of the following sets of statements creates a multidimensional array with 3 rows,where the first row contains 1 value,the second row contains 4 items and the final row contains 2 items?

What kind of application tests a class by creating an object of that class and calling the class's methods?

Which statement below initializes array items to contain 3 rows and 2 columns?

Constant variables also are called .

Which of the following statements creates a multidimensional array with 3 rows,where the first row contains 1 element,the second row contains 4 elements and the final row contains 2 elements?

In Java,multidimensional arrays:

Consider integer array values,which contains 5 elements.Which statements successfully swap the contents of the array at index 3 and index 4?

Which of the following statements is false?

Assume array items contains the integer values 0,2,4,6 and 8.Which of the following set of statements uses the enhanced for loop to display each value in array items?

Which of the following statements about an arc is false?

Introduction to Computers and Java

Introduction to Java Applications

Introduction to Classes and Objects

Control Statements: Part 1

Control Statements: Part 2

Methods: a Deeper Look

Classes and Objects: a Deeper Look

Object Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism

Exception Handling

Atm Case Study,part 1: Object-Oriented Design With the Uml

Atm Case Study,part 2: Implementing an Object-Oriented Design

Gui Components: Part 1

Graphics and Java 2d

Strings

Files,streams and Object Serialization

Recursion

Searching, Sorting and Big O

Generic Collections

Generic Classes and Methods

Custom Generic Data Structures

Applets and Java Web Start

Multimedia: Applets and Applications

Gui, Part 2

Multithreading

Networking

Accessing Databases With Jdbc

Java Server Faces Web Applications

Ajax-Enabled Jsf Web Applications

Web Services

Filters