Java Exception Handling Examples, Exception Handling in Java

Java Exception - Exception Handling in Java

Exception, that means exceptional errors. Actually exceptions are used for handling errors in programs that occurs during the program execution. During the program execution if any error occurs and you want to print your own message or the system message about the error then you write the part of the program which generate the error in the try{} block and catch the errors using catch() block. Exception turns the direction of normal flow of the program control and send to the related catch() block. Error that occurs during the program execution generate a specific object which has the information about the errors occurred in the program.

In the following example code you will see that how the exception handling can be done in java program. This example reads two integer numbers for the variables a and b. If you enter any other character except number ( 0 - 9 ) then the error is caught by NumberFormatException object. After that ex.getMessage() prints the information about the error occurring causes.

Code of the program :


import java.io.*;

 


public class exceptionHandle{

 
  public static void main(String[] args) throws Exception{


    try{

       int a,b;

 
      BufferedReader in = new BufferedReader(new InputStreamReader(System.in));


      a = Integer.parseInt(in.readLine());

       b = Integer.parseInt(in.readLine());

     }


    catch(NumberFormatException ex){


      System.out.println(ex.getMessage() + " is not a numeric value.");

       System.exit(0);

     }

   }

 }

Current Comments

8 comments so far (post your own) View All Comments Latest 10 Comments:

i need to know te difference between the catched exception and un catched exception.
It would be helpful if u post with some examples.

Posted by Arun on Monday, 10.13.08 @ 17:44pm | #81048

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simply gr8.............but i miss a interactive forum......any chance of that?????

Need some ques 4 the experts also....would be gr8 if they answer

Posted by dip on Saturday, 01.12.08 @ 10:41am | #45031

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Explanation of conception is short and excellient.

Posted by Sachin on Monday, 10.1.07 @ 10:27am | #30804

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it's very good site.this is use for that even who is using the java for the first time can easily understand it.

Posted by swapna on Monday, 08.20.07 @ 14:55pm | #23772

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This is really a nice site for beginners of Java> Every thing is described in a very easy Manner so that even a person who is using the java for the first time can easily understand it.

Posted by Amrit pal singh on Friday, 04.13.07 @ 15:41pm | #14098

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Hey, this is an excellent site for JAVA developers who started their career .. excellent one .. Congrats to the roseindia site-masters for maintaning this one

Posted by rengith on Saturday, 03.17.07 @ 12:52pm | #11975

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its good but very old patterned programs are there . plz make it new as it relfects the real world.