Exception Handlers in java............

[dfltusr1234]

Iam trying to write the input from text file into an automotive object.

public void readFile(Automotive a1)
{

BufferedReader inputstream=null;
BufferedWriter outputstream=null;
StringTokenizer st;

try
{
inputstream = new BufferedReader(new FileReader("C:\\CarInputData.txt"));

outputstream = new BufferedWriter(new FileWriter("C:\\CarOutputData.txt"));
String line= inputstream.readLine();

st = new StringTokenizer(line,":");
a1.setName(st.nextToken());
outputstream.write("Car Model :" + a1.getName());
outputstream.newLine();
outputstream.newLine();

catch(NullPointerException e)
{
System.out.println("Null Pointer Exception ");
}

catch(NumberFormatException nfe)
{
System.out.println("Cannot read the number ");
}

catch(ArrayIndexOutOfBoundsException e)
{
System.out.println("Array out of Bounds Exception");
}

catch (FileNotFoundException e)
{
System.out.println("File not found!");
try
{
inputstream.close();
outputstream.close();
}
catch (IOException ioe) {} // disregard close failure
}
catch (IOException e)
{
e.printStackTrace();
try
{
inputstream.close();
outputstream.close();
}
catch (IOException ioe) {} // disregard close failure
System.out.println("Unable to read file!");
}

}// end of readFile

-------------------------------------------------------------------
I have the following requirements:

1.Create an exception handler so it handles at least 5 exceptions
2.(Optional) Enhance your design and code to create any abstract classes so the code is extensible and reusable.

Nothing more is mentioned about them.....

Is my analysis to create a custom exception right???

[cloud4288]

here's a code that i've made:

// CAutomotive.java
// 2007-May-10

package automotive;

import java.awt.*;
import javax.swing.*;
import java.io.*;

public final class CAutomotive {

// attribute(s)
private JFrame jframe;
private JComboBox jcboList;

// constructor(s)
public CAutomotive(String title) {

jframe.setDefaultLookAndFeelDecorated( true );
jframe = new JFrame( title );
jcboList = new JComboBox();

} // close CAutomotive(String)

// accessor(s)
public void setProperties() {

jcboList.setBackground( Color.WHITE );

try {

BufferedReader input =
new BufferedReader( new FileReader("C:\\automotive\\cls\\car_input_data.txt") );
String s = "";

while( (s = input.readLine() ) != null ) {
jcboList.addItem( s );
} // close while

} catch (IOException e) {

} // close try catch

} // close setProperties()

// other method(s)
public void launchFrame() {

setProperties();

jframe.getContentPane().add( jcboList, BorderLayout.NORTH );
jframe.setSize( 200, 200 );
jframe.setResizable( false );
jframe.setVisible( true );


} // close launchFrame()

} // close CAutomotive class


why do you need to have a lot of exceptions?....
what is the purpose of your Automotive object?...
can you explain more so I can help you?...