Assuming that the user enters 45 and 62 as inputs for n1 and n2, respectively, what is the output of the following code snippet?

System.out.print ("Enter a number: "); Scanner in = new Scanner (System.in); String n1 = in.next (); System.out.print ("Enter another number: "); String n2 = in.next (); String result = n1 + n2; System.out.print (result);

107

4562

62

45 + 62

?????

?? 21 ?

Which of the following conditions is true only when the integer variables a, b, and c contain three different values?

(a != b) || (a != c) || (b != c)

!((a == b) && (b == c) && (a == c))

a != b != c

(a != b) && (a != c) && (b != c)

?????

?? 31 ?

Assuming that a user enters 25 as the value for x, what is the output of the following code snippet?

int x; Scanner in = new Scanner(System.in); System.out.print("Enter a number: "); x = in.nextInt();

if (x < 100) x = x + 5; if (x < 500) x = x - 2; if (x > 10) x++; else x--; System.out.println(x);

27

28

30

29

?????

?? 41 ?

What is the output of the code snippet given below?

for (int i = 0; i != 9; ) { System.out.print (" " + i); i = i + 2; }

No output

Invalid for statement

0 2 4 6 8

10 12 14 16 18 . (infinite loop)

0 2 4 6 8 10 12 14 . (infinite loop)

?????

?? 51 ?

How many times does the following code snippet display "Loop Execution"?

for (int i = 0; i < 10; i++) ; { System.out.println("Loop Execution") ; }

None

One time

Infinite loop

Ten times

?????

?? 61 ?

What does the output show when this loop executes and finally terminates?

for ( int i = 20 ; i >= 2 ; i = i - 6 ) { System.out.print ( i + ", " ); }

14, 8, 2

20, 19, 18, 17, . . . 4, 3, 2

20, 14, 8, 2

20, 14, 8, 2, 4

?????

?? 71 ?

Which of the following for loops is not valid?

for ( ; ; ) { . . . }

All are valid.

for (int i = 0, k = 1; ; i++) { . . . }

for (int i = 0) { . . . }

for (int i = 0; ; ) { . . . }

?????

?? 81 ?

Given the following code snippet, what should we change to have all 26 alphabetic characters in the string str?

String str = ""; for ( char c = 'A' ; c < 'Z' ; c++ ) { str = str + c; }

int c = 'A'

str = c + str;

Must change to use a do ... while loop

c <= 'Z'

?????

?? 91 ?

Insert a statement that will correctly terminate this loop when the end of input is reached.

boolean done = false; while (!done) { String input = in.next(); if (input.equalsIgnoreCase("Q")) { __________ } else { double x = Double.parseDouble(input); data.add(x); } }

done = 1;

exit;

done = true;

System.exit(0);

stop;

done = false;

?????

?? 101 ?

How many times will the output line be printed in the following code snippet?

for (int num2 = 1; num2 <= 3; num2++) { for (int num1 = 0; num1 <= 2; num1++) { System.out.println ( "" + num2 + " " + num1 ); } }

12 times

6 times

3 times

9 times

?????

?? 111 ?

Consider the following line of code for calling a method named methodX where data is an integer and varData is an double variable.

methodX (data, varData );

Which one of the following method headers is valid for methodX?

None are correct.

public static void methodX ( double list, int data)

public static void methodX ( double list, double data)

public static void methodX ( String list, int data)

public static void methodX ( int varData, double data)

?????

?? 121 ?

The non-static methods of a class are called the ____ methods of the class.

update

instance

frozen

permanent

?????

?? 131 ?

Which of the following is an example of a local identifier in the following code?

01: public class scopeRule 02: { 03: static double intRate = 0.055; 04: static String name; 05: static int t;

06: public static int main(String[] args) 07: { 08: int first; 09: double u, t; 10: String str; 11: //. . . 12: }

13: public static int first(int x, int y) 14: { 15: int t; 16: }

17: public static double salary; 18: }

name (Line 4)

t (Line 15)

salary (Line 17)

intRate (Line 3)

?????

?? 141 ?

Which of the following identifiers in the following code are usable in method first?

01: public class scopeRule 02: { 03: private double intRate = 0.055; 04: private static String name; 05: private int t;

06: public static int main(String[] args) 07: { 08: int first; 09: double u, t; 10: String str; 11: //. . . 12: }

13: public static int first(int x, int y) 14: { 15: int t; 16: }

17: public double salary; 18: }

Only salary (Line 17)

Both intRate (Line 3) and salary (Line 17)

Only intRate (Line 3)

first (Line 8)

name (Line 4)

?????

?? 151 ?

Which of the following identifiers in the following code are usable in another class?

01: public class scopeRule 02: { 03: private double intRate = 0.055; 04: private static String name; 05: private int t;

06: public static int main(String[] args) 07: { 08: int first; 09: double u, t; 10: String str; 11: //. . . 12: }

13: public static int first(int x, int y) 14: { 15: int t; 16: }

17: public double salary; 18: }

first (Line 13)

salary (Line 17)

Both intRate (Line 3) and salary (Line 17)

intRate (Line 3)

?????

?? 161 ?

In the method first, the programmer wishes to update the value stored in the variable intRate (Line 3). Which of the following is correct?

01: public class scopeRule 02: { 03: private double intRate = 0.055; 04: private String name; 05: private static int t;

06: public static int main(String[] args) 07: { 08: int first; 09: double u, t; 10: String str; 11: //. . . 12: }

13: public static int first(int x, int y) 14: { 15: double intRate; 16: intRate = x * y; 17: }

18: public double salary; 19: }

The code is correct. Nothing needs to be done.

Update it in the method main (Line 6)

Rename the variable on Line 15 to something else.

Write another non-static method to do so.

?????

?? 171 ?

Consider the following class definition.

public class Cylinder extends Object { private double height;

public Cylinder (double radius, double h) { super(radius); height = h; } public double getRadius() { return super.getRadius(); }

public String toString() { return (getRadius() + " " + height); }

public double surfaceArea() { return 2 * 3.14 * getRadius() * height; }

public double volume() { return 3.14 * getRadius() * getRadius() * height; } }

Suppose that you have the following declaration.

Cylinder cyl = new Cylinder(1.5, 10);

Which of the following statements are valid in Java?

System.out.print(cyl.surfaceArea);

cylinder.print();

cyl.volume();

cyl.surfaceArea();