import java.io.*;
import java.lang.Runtime;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class IDE2 extends JFrame
{
	private JButton compileButton;
	private JTextArea errorText;
	private JScrollPane errorScrollPane;

	public static void main ( String args[])
	{
		IDE2 ide = new IDE2();
	
		WindowAdapter windowAdapter = new WindowAdapter()
		{
			public void windowClosing( WindowEvent e )
			{
				System.exit( 0 );
			}
		};
		
		ide.addWindowListener( windowAdapter );
	}

	public IDE2()
	{
		show();

		Container container = getContentPane();
		container.setLayout( new FlowLayout() );

		errorText = new JTextArea(20,40);
		compileButton = new JButton("Compile");
		errorScrollPane = new JScrollPane(errorText);

		compileButton.addActionListener( new ActionListener() 
		{
			public void actionPerformed( ActionEvent e )
			{
                		Compile(getFileName("File to compile?"));
				ShowResults();
			}
		});

		container.add(compileButton);
		container.add(errorScrollPane);

		setSize( 500, 600 );
		show();
 	}

	private void Compile(String fileName)
	{
				
		Runtime runtime = Runtime.getRuntime();
		Process process;

		String[] command = new String[3];
		command[0] = "cmd";
		command[1] = "/c";
		command[2] = "javac " + fileName + " 2> err.out";

		try
		{
			process = runtime.exec(command);
        		
			try 
        		{
        			process.waitFor();
        		}
        		catch (InterruptedException interruptedE)
        		{
        			System.err.println("Compile was interrupted");
        		}
		}
		catch (IOException exception)
		{
			System.out.println(exception.toString());
		}
	}

	private String getFileName(String title)
	{
		String fileName;

		FileDialog fileDialog = new FileDialog(this, title, FileDialog.LOAD);

		fileDialog.setFile("*.java");

		fileDialog.show();

		fileName = fileDialog.getDirectory()  + fileDialog.getFile();

		return fileName;
	}

	private void ShowResults()
    {
		String line;

		errorText.selectAll();
		errorText.cut();

		try
		{	
			FileInputStream errorFile = new FileInputStream( "err.out" );
			BufferedReader errorBuffer = new BufferedReader(new InputStreamReader(errorFile));

			while( ( errorBuffer.ready() ))
			{
				line = errorBuffer.readLine();

				if ( errorBuffer != null )
				{
					errorText.append(line);
					errorText.append("\n");
				}
			}
			
			if (errorText.getText().length() == 0)
			{
					errorText.append("Compiled with no errors...");
			}
		}
		catch (FileNotFoundException Exception)
		{
			System.out.println( "File Not Found" );
		}
		catch (IOException Exception)
		{
			System.out.println( "IO Exception" );

		}			
    }
}