Java

When method defined in subclass which has same signature as a method in a super class, it is known a s method                                  

• Option A : Overloading

• Option B : Overriding

• Option C : Packing

• Option D : None of these

Suppose that s1 and s2 are two strings. Which of the statements or expressions are valid?

(A)  String s3 = s1 + s2;

(B)  String s3 = s1 - s2;

(C)  s1 <= s2

(D)  s1.compareTo(s2);

(E)  integer m = s1.length()

• Option A : (C), (D) & (E)

• Option B : (A), (B) & (C)

• Option C : (D) & (E)

• Option D:(A),(D)&(E)

Which one of the following design patterns provides complete information on class implementations that can be instantiated only once?

• Factory

• Singleton

• Adapter

• Proxy

How do you register a driver?

• Option A :

  Class.forName(): This method dynamically loads the driver's class file into memory, which autom atically registers it.

• Option B :

  DriverManager.registerDriver(): This static method is used in case you are using a non- JDK compliant JVM, such as the one provided by Microsoft

• Option C :

  JDBC Net pure Java driver(Type 4) is the fastest driver because it converts the JDBC calls into vendor s pecific protocol calls.

• Option D:

  Prepared statements reuse the same execution plan for different arguments rather than creating a new e xecution plan every time.

If a thread is to be declared as a daemon thread, it must be declared before

• start method

• run method

• stop method

• None of these

Which of the following is not a component/class of JDBC API?

• Statement

• ResultSet

• SQLException

• ConnectionPool

Which of the following methods belong to the String class?

• length()

• compareTo()

• equals()

• All of these

Which of these interface is implemented by Thread class?

• Runnable

• Connection

• Set

• MapConnection

Which of those doesn’t have an index based structure?

• Set

• List

• Map

• Relation

Which of these keywords is not a part of exception handling?

• Try

• Finally

• Thrown

• Catch