java exceptions

[keshav pradeep ramanath]

Create a class with a main( ) that throws an object of class Exception inside a try block.
Give the constructor for Exception a String argument.
Catch the exception inside a catch clause and print the String argument.
Add a finally clause and print a message to prove you were there.
Please give the solution for the same."Please explain how to use Exception constructor".

[Jesper de Jong]

Welcome to the Ranch!

On JavaRanch, we help people to learn Java. The point of homework is that you learn Java by doing it yourself. You don't learn anything by letting other people do your homework. So, we are not going to give you the complete solution for this assignment just like that. Have you tried writing a program for this assignment already yourself? Show us your code. Explain in detail where exactly you get stuck, and we'll help you with that.

If your question is specifically about the sentence "Give the constructor for Exception a String argument": An Exception is just another class that you can create instances of using the new operator. You're supposed to create a new Exception object, passing a string to the constructor, and then throw the exception. Like this:

throw new Exception("There's a problem!");

[keshav pradeep ramanath]

keshav pradeep ramanath wrote:Create a class with a main( ) that throws an object of class Exception inside a try block.
Give the constructor for Exception a String argument.
Catch the exception inside a catch clause and print the String argument.
Add a finally clause and print a message to prove you were there.
Please give the solution for the same."Please explain how to use Exception constructor".

K.that was very nice on you to suggest me to do tge code by myself!!

public class FirstException
{
FirstException(String msg)
{
msg="this is bound to execute";
System.out.println(msg);
}
public static void main(String[] args)throws Exception
{
try
{
throw new Exception();
}
catch(Exception e)
{
e.printStackTrace();
}

finally
{
System.out.println("i will get printed");
}

}
}



I am not knowing the way to throw an object of class Exception inside a try block!!!Please help...Is it possible to throw an exception in try block??please suggest!!!

[Vijay Tidake]

Hi,

Is it possible to throw an exception in try block

Its possible.

import java.io.FileNotFoundException;

public class FirstException {
	FirstException(String msg) {
		msg = "this is bound to execute";
		System.out.println(msg);
	}

	public static void main(String[] args) throws Exception {
		try {
			// Suppose here you are looking for any resource for eg.File
			// If program is unable to find file
			throw new FileNotFoundException();
		} catch (FileNotFoundException e) {
			throw new Exception("File not found");
		} catch (Exception e) {
			System.out.println(e.getMessage());
		} finally {
			// This block will get get executed whether exception occures or
			// not.
			System.out.println("i will get printed");
		}

	}
}

[keshav pradeep ramanath]

Vijay Tidake wrote:Hi,

Is it possible to throw an exception in try block

Its possible.

import java.io.FileNotFoundException;

public class FirstException {
	FirstException(String msg) {
		msg = "this is bound to execute";
		System.out.println(msg);
	}

	public static void main(String[] args) throws Exception {
		try {
			// Suppose here you are looking for any resource for eg.File
			// If program is unable to find file
			throw new FileNotFoundException();
		} catch (FileNotFoundException e) {
			throw new Exception("File not found");
		} catch (Exception e) {
			System.out.println(e.getMessage());
		} finally {
			// This block will get get executed whether exception occures or
			// not.
			System.out.println("i will get printed");
		}

	}
}

Is the use of code below done correctly?
FirstException(String msg) {
msg = "this is bound to execute";
System.out.println(msg);
}

Im am getting an error saying "cannot find symbol"!!

Please suggest the right way of using the constructor!!I m not just getting as to hw it works!!

[Vijay Tidake]

Hi,

Please suggest the right way of using the constructor!!I m not just getting as to hw it works!!

I/m not clear about your doubt.What are you trying to say?

1.How to use the constructor
2.How to write your own exception
3.How to throw an exception from try block.
4.How throw works in try catch block

Thanks

[Maneesh Godbole]

keshav wrote:K tge hw

Please UseRealWords

[keshav pradeep ramanath]

Vijay Tidake wrote:Hi,

Please suggest the right way of using the constructor!!I m not just getting as to hw it works!!

I/m not clear about your doubt.What are you trying to say?

1.How to use the constructor
2.How to write your own exception
3.How to throw an exception from try block.
4.How throw works in try catch block

Thanks

Its How to use the constructor and How to throw an exception from try block!!!Please help

[Maneesh Godbole]

Im am getting an error saying "cannot find symbol"!!

If you read the error text carefully, you will notice it is referring to the variable "msg"
What is msg? Have you defined it anywhere? (Hint)

[keshav pradeep ramanath]

Maneesh Godbole wrote:

keshav wrote:K tge hw

Please UseRealWords

Yes!!I have defined "msg" in the Exception constructor as" FirstException(String msg){ String msg="this is bound to work";
System.out.println(msg);
} "

[Maneesh Godbole]

keshav pradeep ramanath wrote:
Yes!!I have defined "msg" in the Exception constructor as" FirstException(String msg){ String msg="this is bound to work";
System.out.println(msg);
} "

No you didn't. This is the code you posted before.

FirstException(String msg) { 
    msg = "this is bound to execute"; 
    System.out.println(msg); 
}

Also please UseCodeTags while posting code

[Seetharaman Venkatasamy]

start from here