Interview Questions

1. 1.Interface contains what type of variables?

Options:

a. public, private, default

b. public, protected, private

c. default, protected, static

d. public, default, static

Reveal Answer

2. 2. What is the output of this program? interface calculate { void cal(int item); } class display implements calculate { int x; public void cal(int item) { x = item * item; } } class interfaces { public static void main(String args[]) { display arr = new display; arr.x = 0; arr.cal(2); System.out.print(arr.x); } }

Options:

a. 0

b. 2

c. 4

d. None of the mentioned

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3. 3.What is the output of this program? interface calculate { void cal(int item); } class displayA implements calculate { int x; public void cal(int item) { x = item * item; } } class displayB implements calculate { int x; public void cal(int item) { x = item / item; } } class interfaces { public static void main(String args[]) { displayA arr1 = new displayA; displayB arr2 = new displayB; arr1.x = 0; arr2.x = 0; arr1.cal(2); arr2.cal(2); System.out.print(arr1.x + " " + arr2.x); } }

Options:

a. 0 0

b. 2 2

c. 4 1

d. 1 4

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4. 4. What is the output of this program? interface calculate { int VAR = 0; void cal(int item); } class display implements calculate { int x; public void cal(int item) { if (item<2) x = VAR; else x = item * item; } } class interfaces { public static void main(String args[]) { display[] arr=new display[3]; for(int i=0;i<3;i++) arr[i]=new display(); arr[0].cal(0); arr[1].cal(1); arr[2].cal(2); System.out.print(arr[0].x+" " + arr[1].x + " " + arr[2].x); } }

Options:

a. 0 1 2

b. 0 2 4

c. 0 0 4

d. 0 1 4

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5. 5.what will be the output of the program? public class Foo { public static void main(String[] args) { try { return; } finally { System.out.println( "Finally" ); } } }

Options:

a. Finally

b. Compilation fails.

c. The code runs with no output.

d. An exception is thrown at runtime.

Reveal Answer

6. 6. What will be the output of the program? try { int x = 0; int y = 5 / x; } catch (Exception e) { System.out.println("Exception"); } catch (ArithmeticException ae) { System.out.println(" Arithmetic Exception"); } System.out.println("finished");

Options:

a. finished

b. Exception

c. Compilation fails.

d. Arithmetic Exception

Reveal Answer

7. 7. What will be the output of the program? public class X { public static void main(String [] args) { try { badMethod(); System.out.print("A"); } catch (Exception ex) { System.out.print("B"); } finally { System.out.print("C"); } System.out.print("D"); } public static void badMethod() { throw new Error(); /* Line 22 */ } }

Options:

a. ABCD

b. Compilation fails.

c. C is printed before exiting with an error message.

d. BC is printed before exiting with an error message.

Reveal Answer

8. 8.at will be the output of the program? public class X { public static void main(String [] args) { try { badMethod(); System.out.print("A"); } catch (RuntimeException ex) /* Line 10 */ { System.out.print("B"); } catch (Exception ex1) { System.out.print("C"); } finally { System.out.print("D"); } System.out.print("E"); } public static void badMethod() { throw new RuntimeException(); } }

Options:

a. BD

b. BCD

c. BDE

d. BCDE

Reveal Answer

9. 9. program on to throw a new user define exception class x { public static void exception() { System.out.print(“throw”); throw new RuntimeException(); } public static void main(String args[]){ try { System.out.print(“hello”); exception(); } catch(Exception ex) { System.out.print(“caught”); } finally { System.out.print(“this is finally block”); } System.out.print(“end”); } }

Options:

a. hellothrow Exception caught

b. compile error

c. hellothrow caught finally after

d. runtime error

Reveal Answer

10. 10.given program is used to write contents in a file if no file found using exception handling to control the code. class y { public static void main(String args[]) { FileOutputStream out=null; try { out=new FileOutputStream(“test.text”); out.write(“abc”); } catch(Exception e) { System.out.println(“Exception”); } finally { out.close(); } } }

Options:

a. compiler error

b. Exception caughtfinally

c. its prints “abc”

d. it returns value count value in a file in a file

Reveal Answer

11. 11.given program is used to handle the code by throwing a user defined exception public class Test{ public static void myMethod() throws Exception { try{ throw new exception(); } finally{ System.out.print(“finally”); } } public static void main(String args[]){ try { myMethod(); } catch(Exception e) { System.out.println(“Exception”); } System.out.print(“finally”); } }

Options:

a. finally

b. exception

c. finally exception

d. compiler error

Reveal Answer

12. 12.What will be the output of this code public class Myprogram { public static void myprog() { throw new RuntimeException(); } public static void main(String args[]) { try { System.out.print(“hello”); myprog(); System.out.println(“try”); } finally { System.out.println(“finally”); } } }

Options:

a. hello finally

b. compile error

c. hello finally try

d. finally try hellothrow

Reveal Answer

13. 13. Given program to display a message by using try catch block. Predict the output for the generated code. class x { public static void main() { try { method(); System.out.print(“p”); } catch(Exception e) { System.out.println(“n”); } finally { System.out.println(“n”); } System.out.println(“p”); public static void method() { } } }

Options:

a. pnp

b. pnnp

c. npp

d. npn

Reveal Answer

14. 14.display the console message by handling the code. class Deccansoft { public static void main() { try { System.out.println(“hello”); } finally { System.out.println(“this is final”); } } }

Options:

a. hello

b. hello this is final

c. this is final

d. exception

Reveal Answer

15. 15.Find the output for this code. class Deccansoft { public static void main(String args[]) { try { return; } finally { System.out.println(“finally”); } } }

Options:

a. finally

b. it displays nothing

c. compiler error

Reveal Answer

16. 16.Given code is used to cloning the messages. Find output for this public class Deccansoft { public static void main(String args[]) { try { return; } finally { try { System.out.println("finally"); } catch(Exception e) { throw new RuntimeException("catch with in finally"); } finally { Deccansoft dc = new Deccansoft(); try { dc.clone(); } catch (CloneNotSupportedException ex) { System.out.println("this is clone"); } } } } }

Options:

a. finally this is clone

b. catch with in finally, this is clone

c. finally, catch with in finally

d. this is clone

Reveal Answer

17. 17.program to handle the logical exception class Deccansoft { public static void main (String args[]) { try { int x=0; int y=5/x; } catch (Exception e) { System.out.println(“Exception”); } catch(ArithematicException ae) { System.out.print(“this is arithematic exception”); } System.out.println(“finished”); } }

Options:

a. Finished

b. Exception

c. Compiler error

d. this is arithematic exception

Reveal Answer

18. 18.Given program is used to handle the thread to prevent deadLock. Find the output for this code? class Deccansoft { public static void main(String args[]) { final StringBuffer a=new StringBuffer(); final StringBuffer b=new StringBuffer(); new Thread(); { public void run() { System.out.println(a.append(“a”)); synchronized(b) { System.out.println(“b”); } } Thread.start(); new Thread() { public void run() { System.out.println(b.appnd(“c”); synchronized(a) { System.out.println(a.appendf(“d”)); } } } thread.start(); } }

Options:

a. accbad

b. abbcad

c. cddacb

d. Indeterminate output

Reveal Answer

19. 19.Program to throw the StringIndexOutOfBoundsException. class Deccansoft { void method() { try { String str=”hello”; char ch=str.charAt(5); } catch(StringIndexOutOfBoundsException sie) { System.out.println(“check weather index is in range or not”); throw sie; } } } class New { Deccansoft dc=new Deccansoft(); try { dc.method(); } catch(StringIndexOutOfBoundsException sie) { System.out.println(“caught exception”); } } }

Options:

a. check weather index is in range or not caught exception

b. compile error

c. check weather index is in range or not

d. caught exception

Reveal Answer

20. 20.A program that throws the NullPointerException. Class Deccansoft { static void demo() { try { System.out.println(“demo”); throw new NullPointerException(“Exception data”); } catch(NullPointerException ne) { System.out.println(ne) } } } class NewDemo { public static void main(String args[]) { Deccansoft.demo(); } }

Options:

a. demo Exception data

b. demo

c. ne

d. Exception data

Reveal Answer

21. 21. program that throws IOException. Class Deccansoft { private String name; void accept() { BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); System.out.print(“enter name”); name=br.readline(); } void display() { System.out.println(name); } } class New { public static void main(String args[]) { Deccansoft dc =new Deccansoft(); dc.accept(); dc.display();

Options:

a. it will ask user to print his name

b. IOException

c. NullPointerException

d. ArrayIndexOutOfBounds Exception

Reveal Answer

22. 22. Given program is used to create a file and write contents in the file. public class Excptions { void first() throws FileNotFoundException{ second(); } void second() throws FileNotFoundException{ thrid(); } void thrid() throws FileNotFoundException { FileInputStream fin=new FileInputStream("deccansoft.txt"); } } class NewExcep { public static void main(String[] args)throws FileNotFoundException { Excptions t=new Excptions(); t.first(); } }

Options:

a. Exception occurs

b. compiler error

c. a file created

d. no output

Reveal Answer

23. 23.Exception Handling with method overriding. class Parent { void msg() { System.out.print(“parent”); } } class Child extends Parent { void msg() throws IOException { System.out.println(“child”); } public static void main(String args[]) { Parent p=new Parent(); p.msg(); } }

Options:

a. parent

b. child

c. parent child

d. compiler error

Reveal Answer

Interview Questions and Answer

1. 1.Interface contains what type of variables?

5. 5.what will be the output of the program? public class Foo { public static void main(String[] args) { try { return; } finally { System.out.println( "Finally" ); } } }

6. 6. What will be the output of the program? try { int x = 0; int y = 5 / x; } catch (Exception e) { System.out.println("Exception"); } catch (ArithmeticException ae) { System.out.println(" Arithmetic Exception"); } System.out.println("finished");

14. 14.display the console message by handling the code. class Deccansoft { public static void main() { try { System.out.println(“hello”); } finally { System.out.println(“this is final”); } } }

15. 15.Find the output for this code. class Deccansoft { public static void main(String args[]) { try { return; } finally { System.out.println(“finally”); } } }

23. 23.Exception Handling with method overriding. class Parent { void msg() { System.out.print(“parent”); } } class Child extends Parent { void msg() throws IOException { System.out.println(“child”); } public static void main(String args[]) { Parent p=new Parent(); p.msg(); } }

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