| Java (I) | Which of the following will produce a value of 22 if x=22.9:
| Ceil(x) | Round(x) | Rint(x) | Abs(x) | C |
| Java (I) | If m and n are int type variables, what will be the result of the expression
'm % n' when m = -14 and n = -3? | 4 | 2 | -2 | -4 | C |
| Java (I) | Consider the following statements:
int x = 10, y = 15; x = ((x < y) ? (y + x) : (y - x); What will be the value of x after executing these statements? | 25 | 15 | 5 | Error can't be executed. | A |
| Java (I) | Which of the following will produce a value of 10 if x = 9.7?
| floor(x) | abs(x) | rint(x) | round(x) | D |
| Java (I) | Which of the following control expressions are valid for an if statement?
| an integer expression | a Boolean expression | either A or B | Neither A or B | B |
| Java (I) | Consider the following class definition.
Class Student extends String { } What happens when we try to compile this class? | Will not compile because class body is not defined | Will not compile because class is not declared public | Will compile successfully. | Will not compile because String is abstract | D |
| Java (I) | What is wrong in the following class definitions?
abstract class print { abstract show(); } class Display extends print { } | Nothing is wrong | Wrong Method show() should have a return type
| Wrong Methods show() is not implemented in Display | Wrong Display does not contain any members. | C |
| Java (I) | What is error in the following class definitions?
abstract class xy { abstract sum(int x, int y) {} } | class header is not define properly | constructor is no defined | method is not defined properly | no error
| C |
| Java (I) | Consider the following class definitions:
class maths { student student1; } class student { String name; } This code represents: | an 'is a' relationship | a 'has a' relationship | both | neither | B |
| Java (I) | Which key word can protect a class in package from accessibility by the classes outside the package?
| private | protected | final |
don't use any keyword at all(make it default) | D |
| Java (I) | We would like to make a member of a class visible in all subclasses regardless of what package they are in. Which one of the following keywords would achieve this?
| private | protected | public | private protected | D |
| Java (I) | The use of protected keyword to a member in a class will restrict its visibility as follows:
| Visibility only in the class and its subclasses in the same package. | Visibility only inside the same package. | Visibility in all classes in the same package and subclasses in other packages. | Visibility only in the class where it is declared. | C |
| Java (I) | Which of the following are not keywords?
| NULL | Implements | Protected | None of the above | A |
| Java (I) | Which of the following are keywords?
| integer | default | Boolean | Object | B |
| Java (I) | Which of the following keywords are used to control access to a class member?
| default | protected | interface | None of the above | B |
| Java (I) | The keywords reserved but not used in the initial version of Java re:
| Synchronized | Boolean | union | goto | D |
| Java (I) | A package is a collection of
| classes | interface | editing tools | classes and interfaces | D |
| Java (I) | Which of the following statements are true?
| An abstract class may not have any final methods? | A final class may not have any abstracts methods. | Transient variables must be static. | all of the above | B |
| Java (I) | The concept of multiple inheritance is implemented in Java by
| extending two or more classes | extending one class and implementing one or more interfaces | all the above | B | |
| Java (I) | Which of the following statements are valid array declarations?
| int number(); | float average[]; | double[] marks; | counter int[]; | B |
| Java (I) | Consider the following code
int number[]=new int[5]; | After execution of this statement, which of the following are true? | number[5] is undefined | number[0] is undefined | B | |
| Java (I) | Which of the following classes are available in the java.lang package?
| Random | Stack | String Buffer | Vector | A |
| Java (I) | Which of the following are the wrapper classes?
| Random | Vector | Byte | all of the above | C |
| Java (I) | Which of the following methods belong to the String class?
| length() | compareTo() | substring() | all of the them | D |
| Java (I) | Given the code
String s = new String("abc"); Which of the following calls are valid? | s.toUpperCase() | s.append("xyz") | s.setCharAt(1,'A') | all of the above | A |
| Java (I) | The methods wait() and noify() are defined in
| java.lang.Thread | java.lang.Runnable | java.lang.Object | java.lang.ThreadGroup | C |
| Java (I) | When we invoke repaint () for a Component, the AWT invokes the method:
| draw() | update() | show() | paint() | B |
| Java (I) | What does the following line of code do?
TextField text=new TextField(10); | Creates text object that can hold 10 rows of text. | Creates text object that can hold 10 columns of text. | Creates the object text and initializes it with the value 10. | The code is illegal.
| B |
| Java (I) | Which of the following applet tags is legal to embed an applet class named Test into a web page?
| D | ||||
| Java (I) | Which of the following methods can be used to draw the outline of a square?
| fillRect() | drawLine() | drawString() | all of the above | B |
| Java (I) | Which of the following methods can be used to change the size of a
size() * resize() | component | dimension() | setSize() | size() | C |
| Java (I) | Which of the following methods can be used to remove a component from the display?
| remove() | desappear() | hide() | move() | C |
| Java (I) | The setBackground() method is part of the class
| Applet | Component | Container | Object | B |
| Java (I) | When we implement the Runnable interface, we must define the method
| start() | init() | runnable() | run() | D |
| Java (I) | Which of the following string can be used as mode string for creating a RandomAccessFile object?
| "rw" | "wr" | "0" | ''w'' | A |
| Java (I) | DataInput is
| An abstract class defined is java.io. | A class we can use to read primitive data types. | An interface that defines methods to open files. | An interface that defines methods to read primitive data types. | D |
| Java (I) | Which of the following statements are true?
| UTF characters are all 24 bits. | Reader class has methods that can read integers and floats. | Unicode characters are all 16 bits. | all of the above | C |
| Java (I) | Which are the valid ways to create DataInputStream streams?
| new DataInputStream(new File("in.dat")); | new DataInputStream(new FileInputStream("in.dat")); | new DataInputStream("in.dat");
| new DataInputStream("in.data","r"); | B |
| Java (I) | Which exception is thrown by the read() method of InputStream class?
| IOException | FileNotFoundException | ReadException | None of the above | A |
| Java (I) | In the code below, what data types the variable x can have?
| byte b1 = 5; | byte b2 = 10; | x = b1 * b2; | int short | D |
| Java (I) | If you want to assign a value of 99 to the variable year, then which of the following lines can be used within an | number=getParameter(99) | C | |||
| Java (I) | What is java -g used for?
| Using the jdb tool | Executing a class with optimization turned off | To provided information about deprecated methods | Non of the above | B |
| Java (I) | With javadoc, which of the following denotes a javadoc comment?
| //# | /* | /** | //** | C |
| Java (I) | Give file is a file object, which of the following are legal statements to create a new file.
| file.create(); | FileOutputStream fos=new FileOutputStream(file); | FileInputStream fis=new FileInputStream(file); | all of the above | B |
| Java (I) | Which javadoc tag is used to denote a comment for methods parameters?
| @method | @parameter | @argument | @param | D |
| Java (I) | Which of the following command lines options generates documentation for all classes and methods?
| -protected | -public | -private | -encoding | C |
| Java (I) | Which of the following represent legal flow control statements?
| break; | break(); | continue(inner); | all of the above | A |
| Java (I) | Consider the following code snippet:
try { int x=0; int y=50/x; System.out.println("Division by zero"); } catch(ArithmeticException e) { System.out.println("catch block"); } What will be the output? | Error. Won't compile | Division by zero | Catch block | Division by zero catch block | C |
| Java (I) | Which of the following represent legal flow control statements?
| break(); | continue(inner); | return; | exit(); | C |
| Java (I) | The name of a Java program file must match the name of the class with the extension Java.
| True | False | A | ||
| Java (I) | Two methods cannot have the same name in Java.
| True | False | B | ||
| Java (I) | The modulus operator (%) can be used only with Integer operands.
| True | False
| B | ||
| Java (I) | Declarations can appear anywhere in the body of a Java method.
| True | False
| A | ||
| Java (I) | All the bitwise operators have the same level of precedence in Java.
| True | False | A | ||
| Java (I) | When X is a positive number the operations x>> 2 and x>>>2 both produce the same result.
| True | False | A | ||
| Java (I) | If a=10 and b= 15, then the statement x =(a>b)?a:b; assigns the value 15 to x.
| True | False | A | ||
| Java (I) |
In evaluating a logical expression of type 'Boolean expression 1&& Boolean expression 2', both the Boolean expressions are not always evaluated. | True | False | A | ||
| Java (I) | In evaluating the expression (x == y&& a | True | False | B | ||
| Java (I) | The default case is always required in the switch selection structure.
| True | False | B | ||
| Java (I) |
The break statement is required in the default case of a switch selection structure. | True | False | B | ||
| Java (I) | The expression (x == y && a | True | False | B | ||
| Java (I) | A variable declared inside the for loop control can not be referenced out side the loop.
| True | False | A | ||
| Java (I) | Java always provides a default constructor to a class.
| True | False | B | ||
| Java (I) | When present, package must be the first no comment statement in the file.
| True | False | A | ||
| Java (I) | The import statement is always the first no comment statement in a Java program files.
| True | False | B | ||
| Java (I) | Objects are passed to a method by use of call-by-reference.
| True | False | A | ||
| Java (I) | It is perfectly legal to refer to any instance variable inside of a static method.
| True | False | B | ||
| Java (I) | When we implement an interface method, it should be declared as public.
| True | False | A | ||
| Java (I) | We can over load methods with differences only in their return type.
| True | False | B | ||
| Java (I) | It is an error to have a method with the same signature in both the super class and its subclass.
| True | False | B | ||
| Java (I) | A constructor must always invoke its supper class constructor in its first statement.
| True | False | B | ||
| Java (I) | Any class may be inherited by another class in the same package.
| True | False | B | ||
| Java (I) | Any method in a supper class can be over ridden in its subclass.
| True | False | B | ||
| Java (I) | One the features of is that an array can store many different types of values.
| True | False | B | ||
| Java (I) | An individual array element that is passed to a method and modified in that method will contain the modified value when the called method completes execution.
| True | False | B | ||
| Java (I) | Members of a class specified as private are accessible only to the methods of the class.
| True | False | A | ||
| Java (I) | A method declared as static can not access non-static class members.
| True | False | A | ||
| Java (I) | A static class method can be invoked by simply using the name of the method alone.
| True | False |
|
| B |
| Java (I) | It is an error if a class with one or more abstract methods is not explicitly declared abstract.
| True | False |
|
| A |
| Java (I) | It is perfectly legal to assign a subclass object to a supper class reference.
| True | False |
|
| A |
| Java (I) | Every method of a final in class is implicitly final.
| True | False |
|
| A |
| Java (I) | All methods in an abstract class must be declared abstract.
| True | False |
|
| B |
| Java (I) | When the string objects are compared with ==, the result is true If the strings contain the same values.
| True | False |
|
| B |
| Java (I) | A string object can not be modified after it is created.
| True | False |
|
| A |
| Java (I) | The length of a string object 's1' can be obtained using the expression s1.length.
| True | False |
|
| B |
| Java (I) | A catch can have comma-separated multiple arguments.
| True | False |
|
| B |
| Java (I) | It is an error to catch the same type of exception in two different catch blocks associated with a particular try block.
| True | False |
|
| A |
| Java (I) | Throwing an exception always causes program termination.
| True | False |
|
| B |
| Java (I) | Every call to wait has a corresponding call to notify that will eventually end the wafting.
| True | False |
|
| A |
| Java (I) | Declaring a method synchronized guarantees that the deadlock cannot occur.
| True | False |
|
| A |
| Java (I) | The programmer must explicitly create the system .in and system .out objects.
| True | False |
|
| B |
| Java (I) | To delete a file, we can use an instance of class file.
| True | False |
|
| A |
| Java (I) | A panel can not be added to another panel.
| True | False |
|
| B |
| Java (I) | Frames and applets cannot be used together in the same program.
| True | False |
|
| B |
| Java (I) | A final class may not have any abstract method.
| True | False |
|
| A |
| Java (I) | A class may be both abstract and final.
| True | False |
|
| B |
| Java (I) | A thread can make second thread ineligible for execution by calling the suspend (-) method on second thread.
| True | False |
|
| A |
| Java (I) |
A Java monitor must either extend thread class or implement Runnable interface. | True | False |
|
| B |
| Java (I) | The check box group class is a subclass of the component class.
| True | False |
|
| B |
| Java (I) | If a=10 and b= 15, then the statement x =(a>b)?a:b; assigns the value 15 to x.
| True | False |
|
| A |
| Java (I) | Java is fully object oriented programme. | true | false |
|
| A |
| Java (II) | For all insert, update, delete, query operations on a database, ResultSet object creation is mandatory.
| True. | False. |
|
| B |
| Java (II) | forName() is a static factory method
| True | False |
|
| A |
| Java (II) | DriverManager.getConnection("jdbc:odbc:dsn_name") method does not depend on the class.forName(...) method.
| True. | False. |
|
| B |
| Java (II) | Connection, Statement are interfaces and ResultSet is a class.
| True. | False. |
|
| B |
| Java (II) | JdbcOdbcDriver is an object of Object class
| True | False |
|
| B |
| Java (II) | class.forName(...) creates an instance of java ODBC driver
| True | False |
|
| A |
| Java (II) | Submit button always fires doPost(...)
| True | False
|
|
| B |
| Java (II) | We can add more than one class(es) at the time of compilation Java Beans.
| True. | False. |
|
| A |
| Java (II) | In RMI before running the client program we must start RMI Registry.
| True. | False. |
|
| A |
| Java (II) | An EJB is a server-side component that encapsulates the business logic of an application
| True | False |
|
| A |
| Java (II) | Message-Driven beans act as a listener for the Java Message Service API, processing messages synchronously
| True | False |
|
| B |
| Java (II) | In RMI we invoke client method from remote server
| True | False |
|
| B |
| Java (II) | In order to connect to a database through java program we must create _______-
| Connection, Statement, ResultSet | Connection, ResultSet | Statement, ResultSet | Connection, Statement | D |
| Java (II) | executeUpdate(------------) returns ___________
| Nothing | Returns a ResultSet object | Returns an integer value to show the no. of updated rows | None of the above. | C |
| Java (II) | executeUpdate automatically updates data because___________
| auto commit is on, by default | It performs a hidden commit statement as well | Does not commit | None of the above. | A |
| Java (II) | In a single Servlet class we can use____________
| doGet(...) method only | doPost(...) method only | doGet(...) method and doPost(...) method both at a time. | Either 'a' or 'b' | C |
| Java (II) | putValue(...) method takes _____________________-
| Two arguments of object type | First one is of a character type and second one is of an object type | First one is of an object type and second one is of a character type | None of the above.
| A |
| Java (II) | Servlet has ___________
| init method | doGet(------) method | All of the above methods. |
| C |
| Java (II) | Servlet can have ___________
| get method and post method | get method or post method | Either of the above |
| C |
| Java (II) | JSP files creates ________________
| html files | html files and java files | java files and class files | None of the above. | C |
| Java (II) | A JSP file can be stored_________________
| With the extension .jsp in servlets folder of the jws | With the extension .html in public_html folder of the jws | With the extension .jsp in public_html folder of the jws | None of the above. | C |
| Java (II) | The name of the RMI compiler is ___________
| rmicom | rmic | jrmi | none of the above | B |
| Java (II) | EJBs can be of the following type(s)
None of the above | Entity Bean | Session Bean | Message-driven bean | All of the above | D |
Showing posts with label Objective Questions. Show all posts
Showing posts with label Objective Questions. Show all posts
Java Objective Questions
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