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Q:

What is DriverManager ?

Answer

DriverManager is a class in java.sql package. It is the basic service for managing a set of JDBC drivers.

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Subject: Java

Q:

What are the steps required to execute a query in JDBC?

Answer

First we need to create an instance of a JDBC driver or load JDBC drivers, then we need to register this driver with DriverManager class. Then we can open a connection. By using this connection , we can create a statement object and this object will help us to execute the query.

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Subject: Java

Q:

What is JDBC Driver ?

Answer

The JDBC Driver provides vendor-specific implementations of the abstract classes provided by the JDBC API. This driver is used to connect to the database.

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Subject: Java

Q:

What is JDBC ?

Answer

JDBC technology is an API (included in both J2SE and J2EE releases) that provides cross-DBMS connectivity to a wide range of SQL databases and access to other tabular data sources, such as spreadsheets or flat files. With a JDBC technology-enabled driver, you can connect all corporate data even in a heterogeneous environment.

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Subject: Java

Q:

How to identify a given positive decimal number as even/odd without using % or / operator ?

Answer

You may be very good at coding,but if you questioning how on earth you could solve this problem.Then here is a solution. If you remember the good old days of our primary school then the solution is easy,"division is a matter of iterative subtraction".


public class TestEvenOdd {
public static void main(String arg[ ]){
int num=6;
int result=num;
while(result>=2){
result=result-2;
}
if(result==1){
System.out.println("The number is odd");
}else{
System.out.print("The number is even");
}
}
}

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Subject: Java

Q:

What will be the output of the following code snippet?

Object s1 = new String("Hello");
Object s2 = new String("Hello");
 
if(s1 == s2) {
  System.out.println("s1 and s2 are ==");
}else if (s1.equals(s2)) {
  System.out.println("s1 and s2 are equals()");
}

Answer

Answer : s1 and s2 are equals()


 


Explanation :



 

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Subject: Java

Q:

What is classloader?

Answer

The classloader is a subsystem of JVM that is used to load classes and interfaces.There are many types of classloaders e.g. Bootstrap classloader, Extension classloader, System classloader, Plugin classloader etc.

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Subject: Java

Q:

What is the difference between method overriding and overloading?

Answer

Overriding is a method with the same name and arguments as in a parent, whereas overloading is the same method name but different arguments

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Subject: Java