Question 1

What happens when you compare two primitives of different numerical types?

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compiler error
smaller type is promoted
must explicitly cast
none of the above

Answer

Correct Option: B

Question 2

Are you allowed to have more than one top-level(non-inner) class definition per source file?

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True
False

Answer

Correct Option: A

Question 3

Assume the bit pattern of byte x is: 10110001. What will the sign of x be after x>>2?

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postive
negative
can't be find
none of the above

Answer

Correct Option: B

Question 4

A class can define two methods with the same name as long as the return types are different

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True
False

Answer

Correct Option: B

Question 5

All exceptions inherit from

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java.lang.Exception
java.lang.Error
java.lang.Throwable
none of the above

Answer

Correct Option: C

Question 6

What happens when you compare two primitives of different numerical types?

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compiler error
smaller type is promoted
must explicitly cast
none of the above

Answer

Correct Option: B

Question 7

public static void main(String [] args) { int x = 5; boolean b1 = true; boolean b2 = false; if ((x == 4) && !b2 ) System.out.print("1 "); System.out.print("2 "); if ((b2 = true) && b1 ) System.out.print("3 "); } } What is the result?

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1,3
2,3
Compilation Error
Exception

Answer

Correct Option: B

Question 8

interface I{ void f1(); // 1 public void f2(); // 2 protected void f3(); // 3 private void f4(); // 4 } which lines generate compile time errors?

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compiletime error at lines 1,2,3,4
compiletime error at line 3
compiletime error at line 1
compiletime error at lines 3,4

Answer

Correct Option: D

Question 9

class C1{ public void m1(){ // 1 } } class C2 extends C1{ //2 private void m1(){ } }

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compile time error at line1
compile time error at line2
Run time exception
None Of the above

Answer

Correct Option: B

Question 10

class A extends Thread { public void run() { System.out.print("A"); } } class B { public static void main (String[] args) { A a = new A(); a.start(); a.start(); // 1 } }

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Run Time Exception
Compile Error
the code compile and runs fail
None of the above

Answer

Correct Option: A

Question 11

What type of inheritance does Java have?

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Single Inheritence
Double Inheritence
Multiple Inheritence
Class Inheritence

Answer

Correct Option: A

Question 12

Java runs on.

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Windows
Unix
Solaris
All of the above

Answer

Correct Option: D

Question 13

The Java interpreter is used for the execution of the source code.

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True
False

Answer

Correct Option: A

Question 14

A Vector is declared as follows. What happens if the code tried to add 6 th element to this Vector new vector(5,10)

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The element will be successfully added
ArrayIndexOutOfBounds Exception
The Vector allocates space to accommodate up to 15 elements
None of the above

Answer

Correct Option: A,C

Question 15

Which is the data structure used to store sorted map elements

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HashSet
Hashmap
Map
TreeMap

Answer

Correct Option: D

Question 16

Which of the following is true ?

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Stateless session beans doesn’t preserve any state across method calls
Stateful session beans can be accesses by multiple users at the same time
None of the above
Allof the above

Answer

Correct Option: A

Question 17

Stateful Session beans contain

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Home Interface
Remote Interface
Bean Class
All of the above

Answer

Correct Option: D

Question 18

A method is defined in a class as : void processUser(int i) { } If this method is overriden in a sub class,

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the new method should return int
the new method can return any type of values
the argument list of new method should exactly match that of overriden method
the return type of new method should exactly match that of overriden method

Answer

Correct Option: C,D

Question 19

What is the output of following piece of code ? int x = 2; switch (x) { case 1:System.out.println(”1?); case 2: case 3:System.out.println(”3?); case 4: case 5:System.out.println(”5?);

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No output
3 and 5
1, 3 and 5
3

Answer

Correct Option: B

Question 20

In the init(ServletConfig) method of Servlet life cycle, what method can be used to access the ServletConfig object

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getServletInfo()
getInitParameters()
getServletConfig()
None of the above

Answer

Correct Option: C

Description: programming languages Online Quiz - 192
Number of Questions: 20
Created by: Aliensbrain Bot
Tags: programming languages

programming languages Online Quiz - 192

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