COSC 101

what character(s) is/are used to specify a new line?

%n

public static void main(String\[\] args){

String out = String.format("%-5s", "Hello World"); System.out.print(out);

}

what is printed?

Hello World

int i = 1;
System.out.print(i++);

1

int i = 1;
System.out.print(++i);

2

int i = 1;
System.out.print(i--);

1

int i = 1;
System.out.print(--i);

0

capital types, such as Integer and Double, are called _____ types

reference

int

whole numbers only

boolean

True or False

double

real numbers

String

A sequence of characters

Which of the following data types is a sequence of characters?
int
char
String
chars
Sequence
Character

String

Which of the following formatting specifiers will output a floating-point value with precise to two decimal digits?

%.2f

Which of the following data types are value types?
long
Boolean
Short
bool
double
int

long
double
int

public class abc {
public static void main(String[] args) {
}
}
The source code file for the code above should be named what?

abc.java

class test {
public static void main(String[] args) {
int i = 15;
int j = 20;
System.out.print(i + " " + j);
}
}
What is printed to the screen given the code above?

15 20

Which of the following are value-types?
String
Boolean
double
int

double
int

What is printed to the screen given the following code?

public static void main(String[] args) {
int a = 45 - 4 * 4 / 5 % 4;
System.out.print(a);
}

42

What is printed to the screen given the code below?

public static void main(String[] args) {
double a = 2.0;
double b = 7;
double result = Math.pow(a, b);
String out = String.format("%.2f", result);
System.out.print(result);
}

128.0

What is printed to the screen given the code below?

public static void main(String[] args) {
int a = -2 - -20;
System.out.print(a);
}

18

x -= y

x = x - y

x%= y

x = x%y

x+=y

x=x+y

x/=y

x = x/y

What is printed to the screen given the following code?

public static void main(String[] args) {
int a = 47 + 3 - 2 + 4 % 4;
System.out.print(a);
}

48

Order the following operators based on precedence.

=

&&

%

(int) -- Casting

\+

||

(int)--Casting

%

\+

&&

||

=

\-

difference

\+

sum

%

remainder

=

assignment

/

quotient

*

product

What is printed to the screen given the following code?

public static void main(String[] args) {
double a = 19 / 7;
String out = String.format("%.2f", a);
System.out.print(out);
}

2.00

What is printed to the screen given the following code?

public static void main(String[] args) {
double a = 6.17;
double b = 2.19;
int c = (int)(a + b);
System.out.print(c);
}

8

Since division and multiplication have the same precedence, the evaluation is performed ___ to ___

left right

What is printed to the screen given the code below?

public static void main(String[] args) {
int i = 2640;
int b = 555;
int c = i++ + --b;
System.out.print(c);
}

3194

What is printed to the screen given the following code?

public static void main(String[] args) {
double a = 5.69;
double b = 2.84;
int c = (int)a + (int)b;
System.out.print(c);
}

7

int a = 1;
switch (a) {
case 0:
System.out.print("A");
case 1:
System.out.print("B");
case 2:
System.out.print("C");
}
What is printed to the screen given the code above?

BC

int a = 5;
String s;
switch (a) {
case 1:
s = "A";
case 2:
s = "B";
case 3:
s = "C";
default:
s = "Z";
}
System.out.print(s);
What is printed to the screen given the code above?

Z

char a = 'A';
System.out.print("A");
switch (a) {
case 'a':
System.out.print("B");
break;
case 'b':
System.out.print("C");
break;
}
What is printed to the screen given the code above?

A

Which of the following data types can be used in a switch statement?
String
char
Double
short
int
Boolean
boolean
double
Integer
float
byte
StringBuilder
Array

String
char
short
int
Integer
byte

A switch statement will end after which of the following? (select all that apply)

exit statement
end of the switch statement (right brace })
out statement
break statement
go to statement
continue statement

end of the switch statement(right brace})
break statement

What Java data type is designed to hold the result of a condition (true/false)?

boolean

public static void main(String[] args) {
int salary = 20000;
if (salary > 10000) {
System.out.print("A");
}
else if (salary > 15000) {
System.out.print("B");
}
else if (salary > 20000) {
System.out.print("C");
}
}
What is printed to the screen given the code above?

A

Which of the following would be used to compare Strings named a and b?
a == b
a.equals(b)
a = b
!(a == b)

a.equals(b)

What is printed to the screen given the code below?

public static void main(String[] args) {
int a = 10;
int b = 20;
if (!(a == b)) {
System.out.print("True");
}
else {System.out.print("False");
}
}

true

>=

greater than or equal to

!

inversion

<

less than

less than or equal to

==

equal to

!=

not equal to

>

greater than

public static void main(String[] args) {
int salary = 20000;
if (salary > 10000) {
System.out.print("A");
}
if (salary > 15000) {
System.out.print("B");
}
if (salary > 20000) {
System.out.print("C");
}
}
What is printed to the screen given the code above?

AB

public static void main(String[] args) {
int i = 0;
int j = 10;
while (i

2575

A while loop is best used when the number of iterations is...

indefinite
implied
convergent
large
small
divergent

indefinite

public static void main(String[] args) {
int i = 0;
int j = 11;
while (i < 5 && j > 5) {
i += 1;
j -= 1;
}
System.out.print(i + " " + j);
}
What is printed to the screen given the code above?

5 6

public static void main(String[] args) {
int i = 0;
int j = 49;
while (i

2870

public static void main(String[] args) {
int i = 0;
while (i < 13) {
i += 1;
}
System.out.print(i);
}
What is printed to the screen given the code above?

13

public static void main(String[] args) {
int i = -2;
int j = 16;
int k = 30;
while (i < 5 && j > 5 || k >= 1) {
i += 1;
j -= 1;
k /= 6;
}
System.out.print(i + " " + j + " " + k);
}
What is printed to the screen given the code above?

5 9 0

A loop whose condition can never be false is called a/an ____ loop

infinite

What is printed to the screen given the code below?

public static void main(String[] args) {
int i;
int j = 0;
for (i = 48; i < 472;i++) {
j += 1;
}
System.out.print(j);
}

424

Match the pieces of a for loop with its operation.

for (A; B; C) {
D
}

A- initializer
B- condition
C - step
D - body

What is printed to the screen given the code below?

public static void main(String[] args) {
int i;
int j = 0;
for (i = 181; i != 32; i--) {
j += 1;
}
System.out.print(j);
}

149

What is printed to the screen given the code below?

public static void main(String[] args) {
int i;
int j = 0;
for (i = 38; i < 963;i++) {
j += 1;
}
System.out.print(j);
}

925

What is printed to the screen given the code below?

public static void main(String[] args) {
int i;
int j = 0;
for (i = 169; i != 14; i--) {
j += 1;
}
System.out.print(j);
}

155

What is printed to the screen given the code below?

public static void main(String[] args) {
int i;
int j = 0;
for (i = 152;i

983

Why do for loops usually start with the value 0?
the world wants 0
Euler says there shalt be 0
computers don't know the difference between 1 or 0
computers start counting from 0

computers start counting from 0

What is printed to the screen given the code below?

public static void main(String[] args) {
int i;
int j = 0;
for (i = 33; i < 498;i++) {
j += 1;
}
System.out.print(j);
}

465

What is printed to the screen given the code below?

public static void main(String[] args) {
int i;
int j = 0;
for (i = 153;i

719

What is printed to the screen given the code below?

public static void main(String[] args) {
int i;
int j = 0;
for (i = 35; i < 587;i++) {
j += 1;
}
System.out.print(j);
}

552

Which of the following data types is required when the specifier %d is used?
int
array
double
ArrayList
String
list
Double

int

public static void main(String[] args) {
int a = 13;
int b = 10;
System.out.print(a % b);
}
What is printed given the code above?

3

Which of the following data types is required when the specifier %f is used?
array
String
list
ArrayList
double
boolean
int

double

Which of the following data types can store real numbers? (select all that apply).
boolean
short
double
Integer
Float
char
float
int
Scanner
String
long
Double

double
Float
float
Double

switch (data) {
case 1:
System.out.print("A");
case 2:
System.out.print("B");
case 3:
System.out.print("C");
break;
case 4:
System.out.print("D");
default:
System.out.print("E");
break;
}
What is printed to the screen given the code above if the variable data equals 2?

BC

Which of the following Boolean operators tests for equality?

>=

<

==

public static void main(String[] args) {
int i = 7;
int j = 2;
int k = 5;
if (i > j) {
System.out.print("A");
}
else if (i > k) {
System.out.print("B");
}
else if (k > j) {
System.out.print("C");
}
else {
System.out.print("D");
}
}
What is printed to the screen given the code above?

A

public static void main(String[] args) {
int i = 2;
do {
System.out.print("A");
} while (i-- > -1);
}
What is printed to the screen given the code above?

AAAA

What does the following code print?

int x = -5;
while (x < 0) {
x++;
System.out.print(x + " ");
}

-4 -3-2-1 0

How many stars are printed when the following code is executed?

for (int i = 0; i < 5; i++) {
for (int j = 0; j < 5; j++) {
System.out.println("*");
}
}

25

What is printed to the screen given the code below?

public static void main(String[] args) {
int i = 1298;
int j = 0;
while (i > 0) {
i -= 1;
j += 1;
}
System.out.print(j);
}

1298

9%4

1

13%6

1

25%7

4

45-4 *4 / 5%4

42

class MyClass {
private int mVar;
public int getVar() {
???
}
}
Write the code to replace ??? above in order to return the private member variable mVar in the code above:

return mVar

Which of the following are part of a method? (select all that apply)
Access protection
Function body
Parameter list
Field list
Name
Return type

access protection
function body
parameter list
field list
name
return type

Variables inside of a class are called

fields

Inputs to a method are provided through which of the following?
parameter list
function body
function name
return type

parameter list

A _____ method does NOT have an implicit this parameter.

static

class MyClass {
private int mValue;
public MyClass(int v) {
mValue = v;
}
public void setValue(int v) {
mValue = v;
}
public int getValue() {
return mValue;
}
}
How would you construct a new instance of the class MyClass above with the initial value of 100? MyClass mc =

newMyClass(100)

The new operator returns a reference of an object in memory.
True or False

true

The access protection ____ means that the method or field is visible to everything outside of the class itself.

public

A method may be overloaded only if its ____ is different.

parameter list

To be able to use non-static fields and methods of a class, we must first have an ____ of that class by using the keyword new.

instance

Every non-static method has an implicit parameter called _____ that refers to the object in memory.

this

class MyClass {
public static void main(String[] args) {
MyClass mc1 = new MyClass();
MyClass mc2 = mc1;mc1.setValue(111);
mc2.setValue(555);
System.out.print(mc1.getValue() + " " + mc2.getValue());
}
public void setValue(int val) {
mValue = val;
}
public int getValue() {
return mValue;
}
private int mValue;
}
What is printed to the screen given the code above?

555 555

A/an ___is a method that has no return type and has the same name as the class itself. It runs when the new operator is executed.

constructor

Every parameter in the parameter list must have which of the following? (select all that apply)
name
data type
return type
method name

name
data type