Question 1

The class JOptionPane allows a programmer to use graphical interface components to obtain input from a user.

Accepted Answer

A) True 
 B)False  True

Question 2

In a format specifier, if the flag is set to 'l', then the output of the result is left justified.

Accepted Answer

A) True 
 B)False  False

Question 3

To use the contents of the java.lang package in a program, they must be imported using the import statement.

Accepted Answer

A) True 
 B)False  False

Question 4

Suppose str is a String variable. The statement str = new String("Programming"); is similar to which of the following?

Accepted Answer

A)  new String = "Programming"; 
B)  String new = "Programming"; 
C)  str = "Programming"; 
D)  str new "Programming"; 
A)  new String = "Programming"; 
B)  String new = "Programming"; 
C)  str = "Programming"; 
D)  str new "Programming";

Question 5

Given a decimal number, the method format of the class String returns the string containing the digits of the formatted number.

Accepted Answer

A) True 
 B)False

Question 6

What happens when JOptionPane.PLAIN_MESSAGE is chosen as the messageType parameter?

Accepted Answer

A)  No icon is displayed in the dialog box. 
B)  An X is displayed in the dialog box. 
C)  A question mark is displayed in the dialog box. 
D)  An exclamation point is displayed in the dialog box. 
A)  No icon is displayed in the dialog box. 
B)  An X is displayed in the dialog box. 
C)  A question mark is displayed in the dialog box. 
D)  An exclamation point is displayed in the dialog box.

Question 7

The class JOptionPane is part of the package java.swing.

Accepted Answer

A) True 
 B)False

Question 8

In order to use a predefined method, you only need to know the name of the method and the type of each parameter.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following is a valid statement?
(i) int num = new int(67);
(ii) String name = new ("Doe");
(iii) String name = "Doe";

Accepted Answer

A)  Only (i) 
B)  Only (i) and (ii) 
C)  Only (iii) 
D)  Only (ii) and (iii) 
A)  Only (i) 
B)  Only (i) and (ii) 
C)  Only (iii) 
D)  Only (ii) and (iii)

Question 10

Suppose that name is a String variable. Then the following two statements are equivalent.name = "Danny";
name = new String("Danny");

Accepted Answer

A) True 
 B)False

Question 11

String sentence;
String str1, str2, str3, str4;
Int length1;sentence = "First exam is on Monday.";str1 = sentence.substring(6, 12);
Str2 = str1.substring(0, 4);
Str3 = sentence.replace('i', '#');
Str4 = sentence.indexOf("on");length1 = sentence.length();Based on the code above, what is the value of length1?

Accepted Answer

A)  20 
B)  21 
C)  24 
D)  26 
A)  20 
B)  21 
C)  24 
D)  26

Question 12

The showMessageDialog method has ____ parameter(s).

Accepted Answer

A)  one 
B)  two 
C)  three 
D)  four 
A)  one 
B)  two 
C)  three 
D)  four

Question 13

String objects are mutable.

Accepted Answer

A) True 
 B)False

Question 14

String sentence;
String str1, str2, str3, str4;
Int length1;sentence = "First exam is on Monday.";str1 = sentence.substring(6, 12);
Str2 = str1.substring(0, 4);
Str3 = sentence.replace('i', '#');
Str4 = sentence.indexOf("on");length1 = sentence.length();Based on the code above, what is the value of str1?

Accepted Answer

A)  exam i 
B)  exam 
C)  exam is 
D)  on Monday 
A)  exam i 
B)  exam 
C)  exam is 
D)  on Monday

Question 15

Which of the following outputs 56734.9875 to three decimal places?

Accepted Answer

A)  System.out.printf("3f%", 56734.9875); 
B)  System.out.printf(".3f%", 56734.9875); 
C)  System.out.printf(".03f%", 56734.9875); 
D)  System.out.printf("%.3f", 56734.9875); 
A)  System.out.printf("3f%", 56734.9875); 
B)  System.out.printf(".3f%", 56734.9875); 
C)  System.out.printf(".03f%", 56734.9875); 
D)  System.out.printf("%.3f", 56734.9875);

Question 16

The default output of decimal numbers of the type float is up to nine decimal places.

Accepted Answer

A) True 
 B)False

Question 17

Reference type variables directly store data into their memory space.

Accepted Answer

A) True 
 B)False

Question 18

String sentence;
String str1, str2, str3, str4;
Int length1;sentence = "First exam is on Monday.";str1 = sentence.substring(6, 12);
Str2 = str1.substring(0, 4);
Str3 = sentence.replace('i', '#');
Str4 = sentence.indexOf("on");length1 = sentence.length();Based on the code above, what is the value of str2?

Accepted Answer

A)  Firs 
B)  First 
C)  Monda 
D)  exam 
A)  Firs 
B)  First 
C)  Monda 
D)  exam

Question 19

Suppose the String variable str points to the String object "Sunny day" at the memory address 3600. Then the value of str is:

Accepted Answer

A)  the memory address 3600 
B)  "Sunny day" 
C)  3600 + "Sunny day" 
D)  None of these 
A)  the memory address 3600 
B)  "Sunny day" 
C)  3600 + "Sunny day" 
D)  None of these

Question 20

In the class String, the substring method inserts a string into another string.

Accepted Answer

A) True 
 B)False

The class JOptionPane allows a programmer to use graphical interface components to obtain input from a user.

In a format specifier, if the flag is set to 'l', then the output of the result is left justified.

To use the contents of the java.lang package in a program, they must be imported using the import statement.

Suppose str is a String variable. The statement str = new String("Programming"); is similar to which of the following?

Given a decimal number, the method format of the class String returns the string containing the digits of the formatted number.

What happens when JOptionPane.PLAIN_MESSAGE is chosen as the messageType parameter?

The class JOptionPane is part of the package java.swing.

In order to use a predefined method, you only need to know the name of the method and the type of each parameter.

Which of the following is a valid statement? (i) int num = new int(67); (ii) String name = new ("Doe"); (iii) String name = "Doe";

Suppose that name is a String variable. Then the following two statements are equivalent.name = "Danny"; name = new String("Danny");

The showMessageDialog method has ____ parameter(s).

String objects are mutable.

Which of the following outputs 56734.9875 to three decimal places?

The default output of decimal numbers of the type float is up to nine decimal places.

Reference type variables directly store data into their memory space.

Suppose the String variable str points to the String object "Sunny day" at the memory address 3600. Then the value of str is:

In the class String, the substring method inserts a string into another string.

An Overview of Computers and Programming Languages

Basic Elements of Java

Control Structures I: Selection

Control Structures II: Repetition

Graphical User Interface GUI and Object-Oriented Design OOD

User-Defined Methods

User-Defined Classes

Arrays

Inheritance and Polymorphism

Handling Exceptions and Events

Advanced Guis and Graphics

Recursion

Applications of Arrays Searching and Sorting and Strings

Filters

Exam 3: Introduction to Objects and Input/output

The class JOptionPane allows a programmer to use graphical interface components to obtain input from a user.

In a format specifier, if the flag is set to 'l', then the output of the result is left justified.

To use the contents of the java.lang package in a program, they must be imported using the import statement.

Suppose str is a String variable. The statement str = new String("Programming"); is similar to which of the following?

Given a decimal number, the method format of the class String returns the string containing the digits of the formatted number.

What happens when JOptionPane.PLAIN_MESSAGE is chosen as the messageType parameter?

The class JOptionPane is part of the package java.swing.

In order to use a predefined method, you only need to know the name of the method and the type of each parameter.

Which of the following is a valid statement? (i) int num = new int(67); (ii) String name = new ("Doe"); (iii) String name = "Doe";

Suppose that name is a String variable. Then the following two statements are equivalent.name = "Danny"; name = new String("Danny");

The showMessageDialog method has ____ parameter(s).

String objects are mutable.

Which of the following outputs 56734.9875 to three decimal places?

The default output of decimal numbers of the type float is up to nine decimal places.

Reference type variables directly store data into their memory space.

Suppose the String variable str points to the String object "Sunny day" at the memory address 3600. Then the value of str is:

In the class String, the substring method inserts a string into another string.

An Overview of Computers and Programming Languages

Basic Elements of Java

Control Structures I: Selection

Control Structures II: Repetition

Graphical User Interface GUI and Object-Oriented Design OOD

User-Defined Methods

User-Defined Classes

Arrays

Inheritance and Polymorphism

Handling Exceptions and Events

Advanced Guis and Graphics

Recursion

Applications of Arrays Searching and Sorting and Strings

Filters