Java Final EXAM/50 Questions & answers

Java Final EXAM/50 Questions & answers
Which of these packages is automatically loaded, so you don't need to
import it?


1. java.applet
2. java.awt
3. java.string
4. java.lang - -4. java.lang 100%

-System.out is an object of the class _________________.



1. Applet
2. Output
3. System
4. PrintStream - -4. PrintStream 100%

-Which of these shows the correct way to print a literal number?


1. System.out.println({123.75});
2. System.out.println("123.75");
3. System.out.println('123.75');
4. System.out.println(123.75); 100% - -4. System.out.println(123.75); 100%

-According to the CS 170 style rules, every method and each class must
have a ______________________.



1. Single-line comment
2. Javadoc comment
3. body
4. header - -2. Javadoc comment 100%

-The Java keyword that says class B adds something to, or builds upon the
existing definition for class A is ____________________.



1. extends
2. import

,3. derives
4. inherits - -1. extends 100%

-Consider the following statements.

double x = -987.33;
String y = String.format("%(9.2f", x);

What is the value of y?



1. "(987.33)"
2. "-(987.33)"
3. "-987.33"
4. " (987.33)" - -4. " (987.33)" 100%

-If s is a String object, which of these relational expressions is illegal (that is,
your code will not compile if you use it) :



A. s == "Hi"
B. s != "Hi"
C. s > "Hi"
D. All of these are legal - -C. s > "Hi" 100%

-After the execution of the following code, what will be the value of num if
the input values are 4 5?
int num = readInt();

if (num > 0)
num = num + 10;
else
if (num >= 5)
num = num + 15;



1. 4
2. 14
3. 5
4. 15 - -2. 14 100%

-What is the result of evaluating the expression below? Your answer must be
the correct type:

, •€€€€€ 2 is an int
•€€€€€ 2.0 is a double
•€€€€€ "2" is a String

2 * * .0 + 4.5 - 1 - -4.0 100% Equals 4.0 (100%)

-How can a method send a primitive value back to the caller?



1. By assigning the value to one of its parameters
2. It can call its caller with the value
3. By using the return statement
4. It cannot send primitive values back to the caller - -3. By using the return
statement 100%

-Which of these cannot be used as a case label in a switch statement :



A. case 10:
B. case x: // assume x is a final int variable
C. case 10..20:
D. case 'C': - -C. case 10..20: 100%

-A loop that searches for a particular value in input is called a(n) :



A. counted [or counting] loop
B. sentinel loop
C. data loop
D. endless loop - -B. sentinel loop 100%

-What is the output of the following Java code?

intx=55;
inty=5;

switch(x%7)
{
case0:
case1:
y++;
case2:
case3: