Skip to main content

Q) Explain about “catch” keyword?




A)
->”catch” block is used to create a block of statements.
->in catch block exception handling code is implemented.
->So, catch block is known as “Exception handler”.
->catch block is known as a method block.
It looks like a method. I.e. method name and parameters contained. It contains only exception object reference as argument.
->if exception is not raised in try block catch block is never executed. I.e. control comes to catch block iff exception is raised in try block.
->we can have any no.of catch blocks per try block. I.e. one try block can have any no.of catch blocks, associated with it.
->Between try and catch blocks no other code is allowed.
->both try and catch blocks can be nested.

try
{
       ---
       ---
       ---
       try
       {
             
       }
       catch( e)
       {
             
       }
}
catch(  e)
{
       ---
       ---
       ---
       try
       {
             
       }
       catch( e)
       {

       }
       ---
       ---
       ---
}

->catch(   e) , Here “e” is reference holding the object address
->here “try” contain “try” again “try” , “catch” blocks are there and that is called nested.
That “catch” also contain nested.

Comments

Post a Comment

Popular posts from this blog

Q) Explain repeated deletion of records.

A) //RepeatedDeletion.java import java.util.Scanner; import java.sql.*; class RepeatedDeletion {        public static void main(String[] args) {               Connection con= DriverManager. getConnection ( "jdbc:odbc:prince" , "scott" , "tiger" );               PreparedStatement ps=con.PreparedStatement( "DELETE FROM ACCOUNT WHERE ACCNO=?" );               Scanner s= new Scanner(System. in );               while ( true )               {                      System. out .println( "Enter accno : " );      ...
Post a Comment
Read more

Introduction

1) What is not JDBC? 2) What is the purpose of JDBC? 3) What is ODBC? 4) What is JDBC? 5) What is JDBC architecture? 6) What is JDBC client? What are its responsibilities? 7) What is JDBC API?  8) What is driver manager? 9) What is JDBC driver? What is its role in java database connection? 10) What is database server?
Post a Comment
Read more

Q) Explain about nested classes?

A) ->defining a class with in another class is known as nesting of the class. Ex: class A {        class B        {                      } //nested class, and inner class.because it is not static class. } //enclosing class or outer class. ->static class is declared in inside an another class then it does not become an inner class. Note: non-static nested class is known as “inner class”. In the above example class B is nested but not an inner class. Ex: class D {        static c        {                      } //nested class, but not an inner class , because of static class. } //outer class. ->we have three different kinds of inner classes. 1) Member inner class 2) Meth...
Post a Comment
Read more