SCJP 1.4 Mock Exam

Please select signed integrals
1. char, byte, and short
2. byte, short, int, and long
3. char, short, and long
Java characters are …
1. ASCII code
2. Binary code
3. Unicode
4. ANSI code
Please select the size of an int type
1. 32 bytes
2. 16 bits
3. 32 bits
4. 16 bytes
Select default value of boolean type
1. true
2. false
3. 0
4. 1
Consider the following line of code:
char x[]=new char[10];

After execution, what is value of x[0]?
1. 0
2. ‘\u0000’
3. null
A package statement MUST exist in all classes
1. True
2. False
Please choose invalid identifiers
1. temp
2. BIGint
3. 25_length
4. !length

8. Please select
floating point types

byte
int
double
short
long
float

All operands are evaluated left to right
1. true
2. false
Consider the following line of code:
byte x=64;

byte y=5;

byte z= (byte)(x*y);

After execution what is value of z?
1. 320
2. 0
3. 645
4. 64
Consider the following line of code:
int x=7;

int y=4;

int z=7/4;

After execution what is value of z?
1. 1.75
2. 0
3. 1
4. 2
Please select the true statement for ! operator
1. The ! operator inverts the value of a boolean expression
2. The ! operator inverts the bit pattern of an integral expression.
3. Both A and B
4. None of the above
Please select arithmetic operations which can result in
AirthmeticException
1. Multiplication: *
2. Division: /
3. Modulo: %
4. Addition: +
5. Subtraction: –
Please select operators which perform bit shifts of the binary
representation of the integral types
1. <<
2. >>
3. >>>
4. ~
5. &
6. ^
7. |
A protected method may be overridden by …
1. A private method
2. A protected method
3. A public method
4. All of the above
A public method may not be overridden by …
1. A private method
2. A protected method
3. A public method
4. All of the above
The private modifier can be applied to …
1. A variable
2. A method
3. A top level class
4. All of the above
The abstract modifier can NOT be applied to …
1. A variable
2. A method
3. A class
4. A constructor
A class variable is declared using following modifiers
1. protected
2. private
3. public
4. static
An unary operator operates on a single value
1. True
2. False
The following types of loop are guaranteed to be executed at least
once
1. The do loop
2. The while loop
3. The for loop
4. All of the above
The switch() construct is used to make a choice based upon …
1. A char value
2. An int value
3. A String value
4. None of the above
The circumstances that can prevent execution of the code in a
finally block are
1. The death of the thread
2. The use of System.exit()
3. It is always guaranteed to be executed.
Select correct statement(s)
1. The continue statement abandons the loop altogether
2. The break statement causes the current iteration of the loop to be
  abandoned.
3. The break statement abandons the loop altogether
How can you declare a overloaded method?
1. Reusing the method name with different arguments and same return
  type
2. Reusing the method name with different arguments and different
  return type
3. Reusing the name with identical arguments and return type
4. None of the above
How can you declare a overriding method?
1. Using the same method name with identical arguments and return
  type
2. Using the same method name with identical arguments and different
  return type
3. Using the same method name with different arguments and same
  return type
4. All of the above
When a default constructor is provided by the compiler?
1. If you define no constructor at all in a class
2. When you define at least one constructor
3. It is always provided whether you define a constructor or not
4. It is never provided
A static inner class can access …
1. instance variables of the enclosing class
2. static variables of the enclosing class
3. Both A and B
4. None of the above
An inner class created inside a method can access
1. Any local variables of a method that contain an inner
  class.
2. Any instance variables of the enclosing class
3. Any final variables of the enclosing class or a method that
  contain an inner class.
4. None of the above
Please select true statement(s) for an anonymous inner
class
1. An anonymous class can not extend to a superclass
2. An anonymous class can not implement an interface
3. An anonymous class can extend to a supperclass and implement an
  interface both.
4. An anonymous class can extend to a supperclass or implement an
  interface
Please select true statement(s) for a member inner class
1. An inner class in class scope can have any accessibility of the
  top level class, including private.
2. An Inner class defined local to a block may be static
3. An anonymous inner class can not declare a constructor.
4. An inner class can not have same name as enclosing class.
5. All of the above
Please select invalid statement(s) for a thread
1. You can restart a dead thread
2. You can’t call the methods of a dead thread
3. Both of the above
4. None of the above
Select correct statements for a java.lang.String
1. Strings are sequences of 16 bit Unicode characters.
2. Strings are immutable.
3. Both of the above
4. None of the above
Select correct statements for == operator.
1. It compare object reference of two objects
2. It compare the value of two objects
3. Both of the above
4. None of the above
Please select collection(s) that do not reject duplicates
1. java.util.List
2. java.util.Set
3. java.util.Map
4. All of the above
Please select a default layout manager of the java.awt.Panel
1. java.awt.FlowLayout with left justified
2. java.awt.FlowLayout with center justified
3. java.awt.FlowLayout with right justified
4. None of the above
Please select a default layout manager for the java.awt.Frame
1. java.awt.FlowLayout
2. java.awt.BorderLayout
3. java.awt.GridBagLayout
4. None of the above
Please select true statement for prefix operator(++x/–x).
1. The prefix operator(++x/–x) evaluates the value of the operand
  after increment/decrement operation.
2. The prefix operator(++x/–x) evaluates the value of the operand
  before increment/decrement operation.
3. Both A and B
4. None of the above
Please select true statement(s) for shift operators.
1. >>> operator always produces a positive number.
2. >> always produces a positive number for a positive number.
3. >> always produces a negative number for a negative number.
4. None of the above
Please select true statement(s) for shift operators.
1. Shifting is not allowed in long integral type
2. Shifting is not allowed in float integral type
3. Shifting is not allowed in double integral type
4. Shifting is not allowed in int integral type.
Please identify correct assignment for boolean type.
1. boolean javaExam=true;
2. boolean javaExam=True;
3. boolean javaExam=1;
4. All of the above
Bitwise operator can be applied to …
1. Integral types
2. Float types
3. Both of the above
4. None of the above
instanceof operator can be used with …
1. interfaces
2. Arrays
3. Classes
4. All of the above
Please select true statement(s)
1. The equals method compares content of two objects
2. The == operator tests reference of two objects
3. The equals method compares reference of two objects.
4. The == operator compares content of two objects
Please identify invalid use of comparison operator for the
following code:

String s=new String(“S”);

String t=new String(“T”);

int x=83;

int y=84;
1. s == t
2. x!=y
3. x==s
4. s!=t
Please select true statement(s) for instanceof operator:
1. The instanceof operator can be applied to object reference
2. The instanceof operator can be applied to an array.
3. Both of the above
4. None of the above
please select true statement(s) for static modifier.
1. A static method can access non-static variables of the class.
2. A static method can call non-static methods.
3. A static method can be overridden by non-static method.
4. None of the above
Please, select true statement(s) for thread.
1. Invoking a constructor of a Thread registers the thread with
  thread scheduler.
2. Calling a start() method of thread registers the thread with
  thread scheduler.
3. Calling a run() method of thread registers the thread with thread
  scheduler.
4. All of the above.
Invoking yield() on a running thread cause following effect(s):
1. A running thread will be placed in suspended state.
2. A running thread will be placed in sleeping state.
3. A running thread will be placed in ready state.
4. Neither of the above.
The default priority of the thread is
1. 0
2. 1
3. 5
4. 10
Which of the following methods are NOT static of Thread class?
1. start()
2. sleep(long l)
3. run()
4. yield()
Select true statement(s) about an inner class declared inside a
method, also known as local inner class
1. The local inner class can access any local variables declared in
  the method and the parameters passed to the method.
2. The local inner class can access only public variables declared in
  enclosing class
3. The local inner class can access public, private, and protected
  variables declared in enclosing class.
4. The local inner class can access only final declared variables in
  the method.
How can you prevent class JavaExam from being extended?

A. declare class static
JavaExam

B. declare class
synchronized JavaExam

C. declare class final
JavaExam

D. None of the above

Assume that following methods are declared in one class.
1. public void addElement(Object javaExam)

2. public void addElement( Object [] javaExam)

3. public Object addElement ( int index, Object javaExam)

Please select true statement(s) for above methods.

.
All methods are example of overloading method

A. All methods are example
of overriding method

B. Method # 1 and method #
2 are example of overloading method, whereas method # 3 is an example of
overriding method.

C. None of the above

When can’t you override a method?

.
when method is declared abstract

A. When method is declared
final

B. when method is declared
private

C. when method is declared
static

Please select invalid declaration of the top level class

.
public abstract final class JavaExam

A. public final class
JavaExam implement Runnable

B. protected static class
JavaExam

C. public class JavaExam
extend Thread

Please select invalid types for a switch construct

.
float

A. long

B. String

C. All of the above

Please select invalid java keywords

.
include

A. ifdef

B. sizeof

C. goto

Which of the following statements are NOT true about Java garbage
collection Thread?

.
The garbage collection thread has a low priority

A. The garbage collection
thread can be invoked at any time

B. A call to System.gc()
is guaranteed to invoke garbage collection thread immediately

C. A call to
Runtime.getRuntime().gc() is guaranteed to invoke garbage
collection thread immediately

An inner class can not declare______ variables.

.
static

A. protected

B. final

C. transient

Which of the following types can be added to java.util.Vector?

.
reference

A. null

B. int

C. All of the above

Please select a true statement about delete() method of
java.io.File.

.
It can delete a file

A. It can delete an empty
directory

B. Both of the above

C. Neither of the above

The continue statement causes the current iteration
of the loop to be skipped and the next iteration starts.

.
True

A. False

The return type of constructor is void.

.
True

A. False

‘null’ is valid java type.

.
True

A. False

Invoking a constructor of java.io.File class creates a file on the
file system.

.
True

A. False

Select true statement(s) about native modifier.

.
native modifier can be applied to a class

A. native modifier can be
applied to a method

B. native modifier can be
applied to an instance variable

C. native variable can be
applied to a class variable

What method(s) needed to be declared by a class
implementing Runnable interface?

.
public void start()

A. public void run()

B. public boolean start()

C. public boolean run()

The priority of a newly created thread is always
Thread.NORM_PRIORITY.

.
True

A. False

What methods are declared in java.lang.Thread
class?

.
public static void sleep(long millis, int nanos)

A. public static native
void sleep(long millis, int nanos)

B. public static native
void sleep(long millis)

C. public static void
sleep(long millis)

A yield method of the Thread class suspends the
operation of the current thread.

.
True

A. False

What methods are NOT synchronized in java.util.Vector class?

.
size()

A. add(int index, Object
element)

B. capacity()

C. get(int index)

Please select unchecked exception(s)?

.
java.lang.NullPointerException

A.
java.lang.ClassNotFoundException

B.
java.lang.ClassCastException

C. java.awt.AWTException

Which of the following declarations are valid to throw an
exception?

.
throw new java.lang.Exception();

A. throws new
java.lang.Exception();

B. Both of the above

C. None of the above

Which of the following classes are immutable?

.
java.lang.String

A. java.lang.StringBuffer

B. java.util.Vector

C. java.lang.Integer

Which of the following classes store and retrieve values based on a
key?

.
java.util.Hashtable

A. java.util.Vector

B. java.util.LinkedList

C. java.util.HashMap

Which of the following classes can store null value for a key?

.
java.util.Hashtable

A. java.util.HashMap

B. java.util.Properties

C. All of the above

java.util.Vector uses synchronized methods to store and retrieve
values.

.
True

A. False

java.util.Hashtable uses synchronized methods to store and retrieve
values.

.
True

A. False

java.util.HashMap uses synchronized methods to store and retrieve
values.

.
True

A. False

Which of the following collections maintain object references in
the order they were added?

.
java.util.Vector

A. java.util.Hashtable

B. java.util.HashMap

C. java.util.ArrayList

java.util.hashtable implements which of the following
interfaces?

.
java.util.Dictionary

A. java.util.Map

B. java.util.HashMap

C. java.util.Hashmap

Answers:

B
C
C
B
B
B
C and D
C and F
A
D. Comment: A byte value can represent a range of
-128 to +127. Arithmetically answer is 320, but when you store
this result to a byte variable you will get a value 64 since result is
out of the range (-128 to +127).
C
A
B and C are correct
A, B, and C
B and C
A and B
A and B
A and D
D
A. Comment: + and – operator can take two values
A
A and B
A and B
C
A and B
A
A
B
C
D
A , C, and D
C. Thanks Chris Pereira for your feedback in our discussion
area.
C
A
A
B
B
A
B, and C.
B and C
A
A
D
A and B
C
C
D
B
C
C
A and C
C and D
C
A
B
A, B, C, and D
D
A, B, and C
B, C, and D
A
A and B
C
A
B
A
B
B
B
B Comment: A newly created thread inherits the
priority of the Thread that creates it.
A and C
A
A, B, and C
A and C
A
A and D
A and D
B
A
A
B
A and D
B