Interview Questions Answers in Core Java, SQL PLSQL

Questions / { tamilselvan }

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Answers / { tamilselvan }

Difference between this(), super()?

Answer

this & super is a keyword.
"this" is used to invoke a constructor of a same class,
its pointing the same class object.

"super" is used to invoke a superclass constructor and
accessing the superclass constructor.

Is This Answer Correct ?

25 Yes

3 No

Question { 5541 }

Name two subclasses of the TextComponent class?

Answer

TextComponent is supperclass for TextArea & TextField.

Is This Answer Correct ?

2 Yes

0 No

Question { 9408 }

What is a class ?

Answer

Class is a set of objects, it contains variable,values for
that classes.

Is This Answer Correct ?

1 Yes

0 No

Question { 13485 }

Which class has no duplicate elements?

Answer

java.util.Set Packages, there is no dulicate elements.Bcoz
these interfaces doesn't allows the dulicate values or
elements. For example. HashMap, HashSet, TreeSet and so on.

Is This Answer Correct ?

5 Yes

1 No

Question { 5765 }

What JNDI(Java Naming and Directory Interface) provides?

Answer

Mostly JNDI is using Connection for the GUI(Graphical User
Interface). That's linking with Client to Server Side.

Is This Answer Correct ?

0 Yes

0 No

Question { Honeywell, 26800 }

int a=10,b=20,c=30 a= b+c;b=a+c;c=a+b;
System.out.println("The value is"+a+b+c;

Answer

it gives two error one is (; expected error ) second is ()
expected error).

Is This Answer Correct ?

0 Yes

1 No

Question { Fidelity, 10353 }

suppose string s1="rajnish";
string s2="bhaskar";
then what will be happend ?

Answer

It shows compile error, bcoz without class how it should be
run? so only coming expection. Declaration And all correct.

Is This Answer Correct ?

0 Yes

3 No

Question { iFlex, 9744 }

if we give update table_name set column_name= default.
what will happen?

its given in pl sql block.what will hapen?

Answer

It shouldn't occured any error.
It'll update but value is empty(i.e columns having empty
values)

Is This Answer Correct ?

0 Yes

1 No