Kapitel 2

Question 1

1

Answer 1

// A crazy mixed up program public class Columbus 
{ 
public static void main(String[] args) { 
System.out.println("In 1492 Columbus sailed the ocean blue.");
 } 
}

Question 2

2

Answer 2

Columbus.java

Question 3

3

Answer 3

public class Hello 
{ 
public static void main(String[] args) { 
System.out.println("Hello World"); 
} 
}

Question 4

4

Answer 4

// Example // August 22, 2013 
public class MyName { 
public static void main(String[] args) { System.out.println("Herbert Dorfmann"); 
}
}

Question 5

5

Answer 5

C

Question 6

6

Answer 6

A

Question 7

7

Answer 7

// Its a mad, mad program public class Success 
{ 
public static void main(String[] args) 
{ System.out.print("Success\n"); System.out.print("Success "); System.out.print("Success\n"); System.out.println("\nSuccess"); 
} }

Question 8

8

Answer 8

The works of Wolfgang include the following

The Turkish March and Symphony No. 40 in G minor.

Question 9

9

Answer 9

// August 22, 2013
public class PersonalInfo
{
public static void main(String[] args)
{
System.out.println("Herbert Dorfmann");
System.out.println("123 Elm Street");
System.out.println("My Town, NC 21111");
System.out.println("919-555-1234");
}
}

Question 10

10

Answer 10

Variables:
little
big
Literals:
2
2000
"The little number is "
"The big number is "

Question 11

11

Answer 11

The value is number

Question 12

12

Answer 12

99bottles is illegal because it starts with a number.

r&d is illegal because the & character is illegal.

Question 13

13

Answer 13

They are not the same because one begins with an uppercase S while the other
begins with a lowercase s. Variable names are case-sensitive.

Question 14

14

Answer 14

a) short
b) int
c) 22.1 because it is stored as a double .

Question 15

15

Answer 15

6.31E17

Question 16

16

Answer 16

Append the F suffix to the numeric literal, such as:

number = 7.4F;

Question 17

17

Answer 17

true and false

Question 18

18

Answer 18

a) char letter;
b) letter = ‘A’;
c) System.out.println(letter);

Question 19

19

Answer 19

The code for ‘C’ is 67.
The code for ‘F’ is 70.
The code for ‘W’ is 87.

Question 20

20

Answer 20

‘B’ is a character literal.

Question 21

21

Answer 21

You cannot assign a string literal to a char variable. The statement should be:
char letter = ‘Z’;

Question 22

22

Answer 22

Expression Value
6 + 3 * 5 21
12 / 2 - 4 2
9 + 14 * 2 - 6 31
5 + 19 % 3 - 1 5
(6 + 2) * 3 24
14 / (11 - 4) 2
9 + 12 * (8 - 3) 69

Question 23

23

Answer 23

Integer division. The value 23.0 will be stored in portion .

Question 24

24

Answer 24

a) x += 6;
b) amount -= 4;
c) y *= 4;
d) total /= 27;
e) x %= 7;

Question 25

25

Answer 25

a) No b) Because the result of basePay + bonus results in an int value, which cannot be stored in the short variable totalPay . You can fix the problem by declaring totalPay as an int , or casting the result of the expression to a short .

Question 26

26

Answer 26

a = (float)b;

Question 27

27

Answer 27

String city = "San Francisco";

Question 28

28

Answer 28

stringLength = city.length();

Question 29

29

Answer 29

oneChar = city.charAt(0);

Question 30

30

Answer 30

upperCity = city.toUpperCase();

Question 31

31

Answer 31

lowerCity = city.toLowerCase();

Question 32

32

Answer 32

To write a single line comment you begin the comment with // . To write a multi-line comment you begin the comment with /* and end it with */ . To write a documentation comment you begin the comment with /** and end it with */ .

Question 33

33

Answer 33

Documentation comments can be read and processed by a program named javadoc . The javadoc program can read Java source code files and generate attractively formatted HTML documentation files. If the source code files contain any documentation comments, the information in the comments becomes part of the HTML documentation.

Question 34

34

Answer 34

A message dialog box is used to display a message to the user. An input dialog box is used to gather keyboard input from the user.

Question 35

35

Answer 35

a) JOptionPane.showMessageDialog(null, "Greetings Earthling."); b) str = JOptionPane.showInputDialog("Enter a number.");

Question 36

36

Answer 36

String str; int age; str = JOptionPane.showInputDialog("Enter your age."); age = Integer.parseInt(str);

Question 37

37

Answer 37

import javax.swing.JOptionPane;