Technical Q&A

import java.awt.Frame;
import java.awt.FileDialog;
import java.io.File;
import java.io.IOException;

import com.apple.mrj.MRJFileUtils;

public class ExecTest extends Frame
{
	
	public static void main(String[ ] args)
	{
		new ExecTest();
		System.exit(0);
	}
	
	public ExecTest()
	{
		String url = "http://developer.apple.com/java/";
		
		try
		{
			//Attempt to let MRJ do all the work for us.
     		       MRJFileUtils.openURL(url);
			//If this was successful, then we need not go on.
      			return;
		}
		catch (IOException exc)
		{
			//This can occur if problems arise while attempting to open the URL.
		}
		catch (NoSuchMethodError err)
		{
			//This can occur when earlier versions of MRJ are used which
    	   //do not support the openURL method.
    		}
		catch (NoClassDefFoundError err)
		{
		 //This can occur under runtime environments other than MRJ.
    		}
		
		//If we make it here, MRJ was unsuccessful in opening the URL, and
       //we need to do it the hard way, using Runtime.exec.
		
		String browserName;
		
	 //Set up a FileDialog for the user to locate the browser to use.        
   		FileDialog fileDialog = new java.awt.FileDialog(this);
		fileDialog.setMode(FileDialog.LOAD);
		fileDialog.setTitle("Choose the browser to use:");
		fileDialog.setVisible(true);
		
   //Retrieve the path information from the dialog and verify it.        
     String resultPath = fileDialog.getDirectory();
	 String resultFile = fileDialog.getFile();
	 if(resultPath != null && resultPath.length()!= 0 &&			resultFile != null && resultFile.length() != 0)
		{
			File file = new File(resultPath + resultFile);
			if(file != null)
			{
				browserName = file.getPath();
				
				try
				{
 //Launch the browser and pass it the desired URL
				Runtime.getRuntime().exec(new String[] {browserName, url});
				}
				catch (IOException exc)
				{
					exc.printStackTrace();
				}
			}
		}
	}
}