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Tip of the Day
Language: Java
Expertise: Advanced
Mar 16, 2004



Application Security Testing: An Integral Part of DevOps

How to Write Userdefined Exceptions

Here's an example:

Code For Balance Class

//  Demo class for User-Defined Exceptions To Ensure The
//  Validity of Data Contained In A Class

import java.io.*;

public class Balance
   int bal;
   public Balance(){

   public void setBalance( int amt ){
      this.bal = amt;

   public void withdraw( int amt )
    throws NoSufficientFundException
      if (bal >= amt) {
         bal = bal - amt;
      else  {
         throw new NoSufficientFundException("Balance is less than what u
expect..some error


   public void getBalance()
       return bal;

Code For NoSufficientFundException

//  Exception Class For No Sufficient Fund(userdefined one)

public class NoSufficientFundException extends Exception
    String strValue;

	public PositionException( String value) {
         this.strValue = value;

	public String toString() {
	   return "Exception occurred.. " + strValue;

Code For ( Test)Main Program
// Test Program For Class Balance
// Dealing With The Exceptions That It Throws

import java.io.*;

public class TestBalance
   static public void main( String[] args ) {
      Balance obj = new Balance();

      try {

         //some code....

         obj.withdraw(150); //here the amount we specified is greater than
the actual balance


      catch( NoSufficientFundException e )  {
      } //end of catch
   } //end of main
}//end of TestBalance
Elayaraja David
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