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Q:

Can we compile a java program without main?

Answer

Yes, we can. In order to compile a java program, we don't require any main method. But to execute a java program we must have a main in it (unless it is an applet or servlet). Because main is the starting point of a java program.

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Subject: Java

Q:

What is the security mechanism used in java?

Answer

Java uses sand box security model.

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Subject: Java

Q:

What is a class, member and local variable?

Answer

Variables declared within a method are local variables. Variables declared within the class are member variables.  Variables declared within the class with static modifier are class variables 

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Subject: Java

Q:

 A proxy server is used for which of the following?

A) To provide security against unauthorized users B) To process client requests for Web pages
C) To process client requests for database access D) To provide TCP/IP
 
Answer & Explanation Answer: A) To provide security against unauthorized users

Explanation:
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Filed Under: Database

Q:

 A transitive dependency is which of the following?

A) A functional dependency between two or more key attributes. B) A functional dependency between two or more nonkey attributes.
C) A relation that is in first normal form. D) A relation that is in second normal form.
 
Answer & Explanation Answer: B) A functional dependency between two or more nonkey attributes.

Explanation:
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Filed Under: Database

Q:

If no multivalued attributes exist and no partial dependencies exist in a relation, then the relation is in what normal form?

A) First normal form B) Second normal form
C) Third normal form D) Fourth normal form
 
Answer & Explanation Answer: B) Second normal form

Explanation:
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Q:

A ternary relationship involves how many entities?

A) 3 or less B) 3
C) More than 3 D) 3 or more
 
Answer & Explanation Answer: B) 3

Explanation:
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Q:

 Which JDBC driver Type(s) is(are) the JDBC-ODBC bridge?

A) Type 1 B) Type 2
C) Type 3 D) Type 4
 
Answer & Explanation Answer: A) Type 1

Explanation:
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Filed Under: Database