Interview Questions

1. 1.program om same method call using different operation? class one { int one(int x){ return xx; } } class two extends one { int one(int x) { return xxx; } } class { two ref=new one(); ref.one(5); }

Options:

a. Incompatible types

b. 25

c. 125

d. 25 125

Reveal Answer

2. 2.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

3. 3.check weather the static value can be modified or not. class Test { int a() { static int i=0; i++; return i; } Test t=new Test(); int j=test.a(); System.out.print(i); }

Options:

a. Illegal start of expression

b. 0

c. 1

d. 2

Reveal Answer

4. 4.write a program for assigning Integer value to boolean. int x=10; double y=10.5; boolean b=(x=y); System.out.print(b);

Options:

a. true

b. false

c. compilation error

d. exception

Reveal Answer

5. 5. Write a program to pass the values as arguments and accepting it. class A { final int res(int a, int b) { System.out.println(a+""+b); return 0; } class B extends A { int res(int a, int b) { System.out.println(a+""+b); return 1; } class Test { public static void main(String args[]) { B b=new B(); } System.out.print(b.res(1,2)); }

Options:

a. compile error

b. 1 2

c. 1

d. 2

Reveal Answer

6. class Exc { public static void main(String x[]) { try { System.out.println(“hello”); } catch(Exception e){ System.out.println(“try”); } finally { System.out.print(“Deccansoft”); }

Options:

a. hello Deccansoft

b. hello try Deccansoft

c. try Deccansoft

d. hello try

Reveal Answer

7. 7. A program on displaying sum of two numbers class x { public static void main(String ar[]){ int a=3,b=4; System.out.print(a+b); System.out.print(“ ”+a+b+” “); } }

Options:

a. 7 7

b. 34 7

c. 7 34

d. 34 34

Reveal Answer

8. 8.program for printing loop statement class Test { public static void main(String ar[]){ for(int i=0;i<=5;i++) { System.out.print(i); } System.out. print(i); }

Options:

a. compiler error

b. 0 1 2 3 4 5 6

c. 0 1 2 3 4 5 5

d. 1 2 3 4 5 6 6

Reveal Answer

9. 9.write a program to accept the data from out side of class. class Test{ int x=5; Test(int x){ this.x=x; } static void access() { System.out.print(x); } } class x { Test obj=new Test(55); Test.access();}

Options:

a. 55

b. 5

c. compile error

d. run-time error

Reveal Answer

10. 10.write a program to access the data from outside of the another class class x { private int x; void modify(int a) { x=a; x++; } void access() { System.out.print(x); System.out.print(a); System.out.print(x); } } class samp { x xy =new x(); s.modify(10); s.access(); } }

Options:

a. 10 10

b. compile-error

c. 11 11

d. 10 11

Reveal Answer

11. 11.What is the default value of type char?

Options:

a. null

b. space

c. 0

d. false

Reveal Answer

12. 12.Program on calling a method from static block accessing the data. class Test { Static { Test t=new Test(); t.talk(); } public static void main(String args[]){ Test y=new Test(); y.name; y.age; } String name=”abc”; private int age=20; void talk(){ System.out.println(name+” “+age); }

Options:

a. abc 20 null 0

b. null 0 abc 20

c. abc 20 abc 20

d. compiler error

Reveal Answer

13. 13.program to create an object and it returns true if objects are equal otherwise display a message. class Test { public static void main(String args[]){ Object o=new Object() { boolean equal(Object obj) { return true; } } System.out.print(“nikhil”); }

Options:

a. returns true

b. nikhil

c. exception

d. compilation error

Reveal Answer

14. 14.Write a program on inheritance and check weather the given object is instance of a class or not? class A { } class B extends A { } class C extends A { } class X { A a1=new B(); if(a1 instanceof B) System.out.println(“I'm Class B”); else if(a1 instanceof A) System.out.println(“I'm Class A”); else if(a1 instanceof C) System.out.println(“I'm Class C”); else System.out.print(“no match”); }

Options:

a. I'm Class A

b. I'm Class B

c. I'm Class C

d. no match

Reveal Answer

15. 15.write a program on inheritance where by creating an object and initialize data in it ? Class Test{ final int res(int a, int b) { return 0; } } Class Test1 extends Test { final int res(int a, int b) { return 1; } } Class x { Test1 tes=new Test1(); System.out.println(tes.res(0,1)); }

Options:

a. 0

b. 1

c. compile error

d. exception

Reveal Answer

16. 16.program to print the elements in a command line arguments. public class Part2 { public static void main(String[] args) { System.out.println("hello"+args[0]); } }

Options:

a. hello

b. hello null

c. hello 0

d. compile error

Reveal Answer

17. 17.program to count the value for given n number interface Count { short counter=0; void countMe(); } class Test implements Count { public static void main(String args[]){ Test t= new Test(); t.countMe(); } public void countMe() { for(int x=6;x>counter; x--,++counter); { System.out.print(counter); } }

Options:

a. 0 1 2

b. 1 2 3

c. 0 1 2 3

d. compiler error

Reveal Answer

18. 18.write a program on inheritance and access the sub class from the super class. class A { A(int x){ } class B extends A{ } class Test{ public static void main(String args[]){ A a= new B(); System.out.print(“completed”); } }

Options:

a. completed

b. compile error

c. exception

d. displays empty

Reveal Answer

19. 19.write a program to create a objects and swap the objects and store the values and display result . class Test { public static void main(String args[]) { Test t, t1, t2; t1=new Test(); t2=new res(t1); t=new Test(); t1=t2; } static Test res(Test result) { result=new Test(); return result; } }

Options:

a. 1

b. 0

c. 2

d. 3

Reveal Answer

20. 20.write a program to accept the string by using constructor with similar parameters. class x { int i=0; public x(String s) 20.write a program to accept the string by using constructor with similar parameters. class x { int i=0; public x(String s) { i=1; } class y extends x { public y(String s) { i=2; } public static void main(String args[]) { y z=new y(“hello”); System.out.println(y.i); } } a)0 b)1 c)2 d)compiler error Answer: D { i=1; } class y extends x { public y(String s) { i=2; } public static void main(String args[]) { y z=new y(“hello”); System.out.println(y.i); } }

Options:

a. 0

b. 1

c. 2

d. compiler error

Reveal Answer

21. 21.what will be the output for this code? Class Deccansoft { void a() { System.out.print(“Deccansoft”); } public static void main(String args[]) { new Deccansoft(); } }

Options:

a. class Deccansoft

b. compile error

c. exception

d. no output

Reveal Answer

22. 22. write a program to display the details of a person public class Deccansoft { private String name="raju"; private int age=30; Deccansoft talk() { age=this.age; return age; } deccansoft talk(String name) { this.name=name; return name; } } class y { public static void main(String[] args) { Deccansoft ob=new Deccansoft(); System.out.println(ob.talk()); System.out.println(ob.talk("hello")); } }

Options:

a. hello 30

b. raju 30

c. compile error at class y

d. compile error at line 6

Reveal Answer

23. 23.Access a person details in another class by creating object to it. class deccansoft { private int age=20; private String name=”hello”; deccansoft talk() { age=this.age; return age; } deccansoft talk(String name) { this.name=name; return name; } class Another { public static void main(String args[]) { Deccansoft dc=new Deccansoft(); System.out.println(dc.name); System.out.print(ds.talk(“welcome”)); System.out.println(dc.age);

Options:

a. hello 20

b. welcome 20

c. compiler error

d. 20

Reveal Answer

24. 24.Access a person details in another class by creating object to it. class deccansoft { private int age=20; private String name=”hello”; int talk() { this.age=age; return age; } int talk(String name) { this.name=name; System.out.print(name); return name; } class Another { public static void main(String args[]) { Deccansoft dc=new Deccansoft(); System.out.println(dc.name); System.out.println(dc.age); } }

Options:

a. hello 20

b. 20

c. hello

d. compiler error

Reveal Answer

25. 25. Implementing abstract methods of my interface. interface hello { interface app { void hippo(String a, app p); } } class a implements hello.app { @Override public void hippo(String a, app p) { throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. } }

Options:

a. compiler error

b. Not supported yet

c. exception

d. can't determine

Reveal Answer

Interview Questions and Answer

1. 1.program om same method call using different operation? class one { int one(int x){ return xx; } } class two extends one { int one(int x) { return xxx; } } class { two ref=new one(); ref.one(5); }

2. 2.Interface contains what type of variables?

3. 3.check weather the static value can be modified or not. class Test { int a() { static int i=0; i++; return i; } Test t=new Test(); int j=test.a(); System.out.print(i); }

4. 4.write a program for assigning Integer value to boolean. int x=10; double y=10.5; boolean b=(x=y); System.out.print(b);

6. class Exc { public static void main(String x[]) { try { System.out.println(“hello”); } catch(Exception e){ System.out.println(“try”); } finally { System.out.print(“Deccansoft”); }

7. 7. A program on displaying sum of two numbers class x { public static void main(String ar[]){ int a=3,b=4; System.out.print(a+b); System.out.print(“ ”+a+b+” “); } }

8. 8.program for printing loop statement class Test { public static void main(String ar[]){ for(int i=0;i<=5;i++) { System.out.print(i); } System.out. print(i); }

9. 9.write a program to accept the data from out side of class. class Test{ int x=5; Test(int x){ this.x=x; } static void access() { System.out.print(x); } } class x { Test obj=new Test(55); Test.access();}

10. 10.write a program to access the data from outside of the another class class x { private int x; void modify(int a) { x=a; x++; } void access() { System.out.print(x); System.out.print(a); System.out.print(x); } } class samp { x xy =new x(); s.modify(10); s.access(); } }

11. 11.What is the default value of type char?

12. 12.Program on calling a method from static block accessing the data. class Test { Static { Test t=new Test(); t.talk(); } public static void main(String args[]){ Test y=new Test(); y.name; y.age; } String name=”abc”; private int age=20; void talk(){ System.out.println(name+” “+age); }

13. 13.program to create an object and it returns true if objects are equal otherwise display a message. class Test { public static void main(String args[]){ Object o=new Object() { boolean equal(Object obj) { return true; } } System.out.print(“nikhil”); }

15. 15.write a program on inheritance where by creating an object and initialize data in it ? Class Test{ final int res(int a, int b) { return 0; } } Class Test1 extends Test { final int res(int a, int b) { return 1; } } Class x { Test1 tes=new Test1(); System.out.println(tes.res(0,1)); }

16. 16.program to print the elements in a command line arguments. public class Part2 { public static void main(String[] args) { System.out.println("hello"+args[0]); } }

18. 18.write a program on inheritance and access the sub class from the super class. class A { A(int x){ } class B extends A{ } class Test{ public static void main(String args[]){ A a= new B(); System.out.print(“completed”); } }

19. 19.write a program to create a objects and swap the objects and store the values and display result . class Test { public static void main(String args[]) { Test t, t1, t2; t1=new Test(); t2=new res(t1); t=new Test(); t1=t2; } static Test res(Test result) { result=new Test(); return result; } }

21. 21.what will be the output for this code? Class Deccansoft { void a() { System.out.print(“Deccansoft”); } public static void main(String args[]) { new Deccansoft(); } }

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