Technology Questions

Path and Classpath are operating system level environment variales. Path is used define where the system can find the executables(.exe) files and classpath is used to specify the location .class files.

To use an iterator to traverse through the contents of a collection, follow these steps:

- Obtain an iterator to the start of the collection by calling the collections iterator() method.

- Set up a loop that makes a call to hasNext(). Have the loop iterate as long as hasNext() returns true.

- Within the loop, obtain each element by calling next().

Group of tables physically stored together because they share common columns and are often used together is called Cluster.

Constructor is not a special method.

Constructor is block of code that is executed automatically whenever object of the class is created.

- Because of the block nature, multiple statements are processed at once thereby improving performance. 

- PL/SQL handles exceptions on catching which, action can be taken. 

- PL/SQL is highly portable as it works with all procedural languages and is highly secured because of privileges.

long lastModified();

we can give this return value to a date object and we can get data to be displayed.

Because any Database will supports only 16 foreign keys in a database table. 

It depends upon the Database limits provided to define the Foreign key constraint, e.g. in Sql Server 2005, the recommended max limit for foreign keys is 253, but you can define more.

Wrapped classes are classes that allow primitive types to be accessed as objects.