13008545
Descripción
Test por Faheem Ahmed, actualizado hace más de 1 año
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Creado por Faheem Ahmed
hace alrededor de 6 años
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Pregunta 1
Pregunta
What modifier is to be used if you wish to declare that you want to no longer allow subclasses to override your variables or methods?
Respuesta
-
Finally
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Abstract
-
Final
-
Synchronized
-
Volatile
Pregunta 2
Pregunta
AWT stands for
Respuesta
-
Advanced windowing tool kit
-
Abstract Windowing Term Kit
-
Abstract Windowing Tool Kit
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Applet Window Tool Kit
-
Asynchronous windowing tool kit
Pregunta 3
Pregunta
Which operator is used for concatenation in java?
Respuesta
-
-
-
. (Dot)
-
*
-
%
-
+
Pregunta 4
Pregunta
What is the type and value of the following expression?
-4 + 1/2 + 2*-3 + 5.0
Respuesta
-
int -5
-
double -4.5
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int -4
-
double -5.0
Pregunta 5
Pregunta
In object-oriented programming, the process by which one object acquires the properties of another object is called
Respuesta
-
Encapsulation
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Polymorphism
-
Overloading
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Inheritance
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Overriding
Pregunta 6
Pregunta
Java compiler javac translates Java source code into ………………………
Respuesta
-
Assembler language
-
Byte code
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Bit code
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Machine code
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Platform dependent code
Pregunta 7
Pregunta
Which of the following statements about Java Threads is correct?
Respuesta
-
Java threads don’t allow parts of a program to be executed in parallel
-
Java is a single-threaded language
-
Java’s garbage collector runs as a high priority thread
-
Ready, running and sleeping are three states that a thread can be in during its life cycle
-
Every java application is not multithreaded
Pregunta 8
Pregunta
The wrapping up of data and functions into a single unit is called
Respuesta
-
Encapsulation
-
Abstraction
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Data Hiding
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Polymorphism
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Message passing
Pregunta 9
Pregunta
In Java, declaring a class abstract is useful
Respuesta
-
To prevent developers from further extending the class
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When it doesn't make sense to have objects of that class
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When default implementations of some methods are not desirable
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To force developers to extend the class not to use its capabilities
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When it makes sense to have objects of that class
Pregunta 10
Pregunta
Which of the following is a member of the java.lang package?
Respuesta
-
List
-
Queue
-
Math
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Stack
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Process
Pregunta 11
Pregunta
URL stands for
Respuesta
-
Universal reader locator
-
Universal reform loader
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Uniform resource loader
-
Uniform resource locator
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Uniform reader locator
Pregunta 12
Pregunta
What is the sequence of major events in the life of an applet?
Respuesta
-
init, start, stop, destroy
-
start, init , stop , destroy
-
init, start , destroy, stop
-
init, start, destroy
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destroy, start, init, stop
Pregunta 13
Pregunta
What will be the result of the expression 13 & 25?
Respuesta
-
38
-
25
-
9
-
12
-
21
Pregunta 14
Pregunta
What information may be obtained from a ResultSetMetaData object?
Respuesta
-
Database URL and product name
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JDBC driver name and version
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Number of columns in the result set
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Number of rows in the result set
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Number of tables in the database
Pregunta 15
Pregunta
Which is a special file that contains information about the files packaged in a JAR file?
Respuesta
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Class file
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Source file
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Text file
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Manifest file
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Image file
Pregunta 16
Pregunta
Evaluate the Java expressions:
int i=3, j=7, k=11;
j + k % i
Respuesta
-
9
-
0
-
7
-
12
-
10
Pregunta 17
Pregunta
Which of the following provides the naming services for the server to register the object and for the client to locate the object?
Respuesta
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Server object interface
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Server implementation
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RMI Registry
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Server stub
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Server Skeleton
Pregunta 18
Pregunta
Which is not a valid operator in Java?
Respuesta
-
<>
-
=>
-
<=
-
+=
-
!=
Pregunta 19
Pregunta
Which of the following is not an Applet method?
Respuesta
-
start()
-
init()
-
run()
-
stop()
-
destroy()
Pregunta 20
Pregunta
If ClassA extends ClassB, then
Respuesta
-
ClassA is a superclass
-
ClassB is a base class
-
ClassB is a subclass
-
ClassB is a derived class
-
ClassA is a base class
Pregunta 21
Pregunta
SSL stands for
Respuesta
-
Secure Server Layer
-
Secure Socket Layer
-
Server Socket Layer
-
Session Service Layer
Pregunta 22
Pregunta
Consider the following HTML page code:
< html > < body >
< a href='/servlet/HelloServlet' >POST< /a >
< /body >< /html >
Which method of HelloServIet will be invoked when the hyperlink is clicked?
Respuesta
-
doGet
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doPost
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doHref
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servicePost
Pregunta 23
Pregunta
Stub is a ____________ proxy for the remote object.
Respuesta
-
Server side
-
Client side
-
Both side
-
none of the above
Pregunta 24
Pregunta
What is the Output:
String s1 = new String("Test");
String s2 = new String("Test");
if (s1==s2)
System.out.println("Same");
if (s1.equals(s2))
System.out.println("Equals");
Respuesta
-
Same Equals
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Equals
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Same
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The code compiles, but nothing is displayed upon execution.
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The code fails to compile
Pregunta 25
Pregunta
Which declaration of the main method below would allow a class to be started as a standalone program.
Respuesta
-
public static int main(char args[])
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public static void main(String args[])
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public static void main(string args[])
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public static void main(String args)
Pregunta 26
Pregunta
Which of these are legal identifiers.
Respuesta
-
number_1
-
number_a
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$1234
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All of the above
Pregunta 27
Pregunta
Which of the following are keywords in Java.
Respuesta
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implement
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friend
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NULL
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synchronized
Pregunta 28
Pregunta
Given a one dimensional array arr, what is the correct way of getting the number of elements in arr.
Respuesta
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arr.length
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arr.length - 1
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arr.size
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arr.length()
Pregunta 29
Pregunta
A class can have many methods with the same name as long as the number of parameters or type of parameters is different. This OOP concept is known as
Respuesta
-
Method Invocating
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Method Overriding
-
Method Labeling
-
Method Overloading
Pregunta 30
Pregunta
Is this True or False. In Java an abstract class cannot be sub-classed.
Respuesta
-
True
-
False
Pregunta 31
Pregunta
What is returned when the method substring(2, 4) is invoked on the string "example"? Include the answer in quotes as the result is of type String.
Respuesta
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"xa"
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"am"
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"xm"
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"xamp"
Pregunta 32
Pregunta
What is the result of evaluating the expression 14 ^ 23. Select the one correct answer.
Respuesta
-
23
-
24
-
25
-
26
Pregunta 33
Pregunta
Which of the following is not a return type?
Respuesta
-
boolean
-
void
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public
-
Button
Pregunta 34
Pregunta
Which operator is used to perform bitwise exclusive or.
Respuesta
-
&
-
^
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|
-
!
Pregunta 35
Pregunta
If result = 2 + 3 * 5, what is the value and type of result variable?
Respuesta
-
17, byte
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25, byte
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17, int
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25, int
Pregunta 36
Pregunta
All the wrapper classes (Integer, Boolean, Float, Short, Long, Double and Character) in java
Respuesta
-
are final
-
are private
-
are serializable
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are immutatable
Pregunta 37
Pregunta
What is the result of compiling and running this program? Select the one correct answer.
public class test
{ public static void main(String args[])
{ int i, j;
int k = 0;
j = 2;
k = j = i = 1;
System.out.println(k);
}
}
Respuesta
-
The program does not compile as k is being read without being initialized.
-
The program does not compile because of the statement k = j = i = 1;
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The program compiles and runs printing 1.
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The program compiles and runs printing 2.
Pregunta 38
Pregunta
A program needs to store the name, salary, and age of employees in years. Which of the following data types should be used to create the Employee class. Select the three correct answers.
a. char
b. boolean
c. Boolean
d. String
e. int
f. double
Respuesta
-
a,d,f
-
a,e,f
-
d,e,f
-
d,a,e
Pregunta 39
Pregunta
When we go for thread synchronization?
Respuesta
-
to remove the lock on the thread
-
when there is a single thread
-
to make a thread in sleep mode
-
when we want to prevent any other multiple thread to act an same object
Pregunta 40
Pregunta
Which statement is true?
public void test(int x)
{ int odd = 1;
if(odd)
{ System.out.println("odd"); }
else
{ System.out.println("even"); }
}
Respuesta
-
"odd" will always be output.
-
"even" will always be output.
-
Compilation fails.
-
"odd" will be output for odd values of x, and "even" for even values.
Pregunta 41
Pregunta
Which code determines the int value data closer to, but not greater than, a double value b?
Respuesta
-
int data = (int) Math.floor(b);
-
int data = (int) Math.abs(b);
-
int data = (int) Math.ceil(b);
-
int data = (int) Math.min(b);
Pregunta 42
Pregunta
Which of the following statements is false as far as different type of statements is concern in JDBC?
Respuesta
-
Regular Statement
-
Interim Statement
-
Callable Statement
-
Prepared Statement
Pregunta 43
Pregunta
Which of the following describes the correct sequence of the steps involved in making a connection with a database.
1. Loading the driver
2. Process the results.
3. Making the connection with the database.
4. Executing the SQL statements.
Respuesta
-
1,2,3,4
-
1,3,4,2
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2,1,3,4
-
4,1,2,3
Pregunta 44
Pregunta
Which one not a JDBC interface?
Respuesta
-
Connection
-
Statement
-
DriverManager
-
ResultSet
Pregunta 45
Pregunta
Which one is a correct MySql Driver class name?
Respuesta
-
com.mysql.jdbc.driver.Driver
-
com.jdbc.mysql.Driver
-
com.mysql.jdbc.Driver
-
none of these
Pregunta 46
Pregunta
Which one correct JDBC statements?
Respuesta
-
Statement
-
PreparedStatement
-
CallableStatement
-
all of above
Pregunta 47
Pregunta
Where the stored procedures reside?
Respuesta
-
In side server memory
-
In side cache
-
In side database
-
In side browser
Pregunta 48
Pregunta
By default cursor pointing to-
Respuesta
-
Column Header
-
First Record
-
Last Record
-
Middle Record
Pregunta 49
Pregunta
By default "auto commit" option is -
Respuesta
-
true
-
false
Pregunta 50
Pregunta
We can get the column names using?
Respuesta
-
ResultSetColumnData
-
ResultSetMetaData
-
ResultSetHeaderData
-
ResultSetTableData
Pregunta 51
Pregunta
SELECT, INSERT, DELETE, UPDATE, COMMIT and ROLLBACK comes under ?
Respuesta
-
DML
-
DDL
-
DCL
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