### Source code for MyFieldParserExample.java:

>     import java.text.ParseException;
>     public class MyFieldParserExample
>     {
>     	public String myFieldParser(String inputStr)
>     		throws ParseException
>     	{
>     		int colon = inputStr.indexOf(':');
>     		if(colon == -1) // simple test for ':'
>     		{
>     			throw new ParseException(inputStr, inputStr.length() -1 );
>     		}
>     		// found a colon, we are safe to continue parsing
>     		// ...
>     		// This next line wasn't in the book, and could be
>     		// any parsing.  We picked the substring up to, but
>     		// not inluding, the colon.
>     		String parsedString = inputStr.substring(0, colon);
>     		return(parsedString);
>     	}

>     	public void testValue(String s)
>     	{
>     		String beforeColon = null;
>     		try
>     		{
>     			beforeColon = myFieldParser(s);
>     		}
>     		catch (ParseException e)
>     		{
>     			System.out.println(e);
>     			e.printStackTrace();
>     			// You could do more here.
>     		}
>     	}

>     	public static void main(String args[])
>     	{
>     		MyFieldParserExample ex = new MyFieldParserExample();
>     		ex.testValue("This is good:it has a colon.");
>     		ex.testValue("This is bad.  It does not have a colon.");
>     	}
>     }

### Output from MyFieldParserExample.java:

    java.text.ParseException: This is bad.  It does not have a colon.
    java.text.ParseException: This is bad.  It does not have a colon.
    	at java.lang.Throwable.fillInStackTrace(Native Method)
    	at java.lang.Throwable.(Throwable.java:94)
    	at java.lang.Exception.(Exception.java:42)
    	at java.text.ParseException.(ParseException.java:54)
    	at MyFieldParserExample.myFieldParser(MyFieldParserExample.java:10)
    	at MyFieldParserExample.testValue(MyFieldParserExample.java:26)
    	at MyFieldParserExample.main(MyFieldParserExample.java:40)

--- Output Ends ---

#### NOTE:

You are reading previously generated output. You are not currently running the MyFieldParserExample application at the momement. You need to compile and run the source code first.

#### To run this program:

`
- javac MyFieldParserExample.java
- java MyFieldParserExample
`

Authors: Kevin Chu and Eric Brower
Copyright 2000 Prentice Hall PTR