Im supposed to calculaate the body mass index using java on Eclipse and design the GUI. Below you will see the code im using and the GUI I design, must have Exception Handling

package edu.pupr.BMI;

import org.eclipse.swt.widgets.Display;

import org.eclipse.swt.widgets.Shell;

import org.eclipse.swt.widgets.Text;

import org.eclipse.swt.SWT;

import org.eclipse.swt.widgets.Label;

import org.eclipse.swt.widgets.Button;

import org.eclipse.swt.events.SelectionAdapter;

import org.eclipse.swt.events.SelectionEvent;

public class BMI {

protected Shell shell;

private Text text;

private Text text_1;

private Text text_2;

private Text text_3;

/**

* Launch the application.

* @param args

*/

public static void main(String[] args) {

try {

BMI window = new BMI();

window.open();

} catch (Exception e) {

e.printStackTrace();

}

}

/**

* Open the window.

*/

public void open() {

Display display = Display.getDefault();

createContents();

shell.open();

shell.layout();

while (!shell.isDisposed()) {

if (!display.readAndDispatch()) {

display.sleep();

}

}

}

/**

* Create contents of the window.

*/

protected void createContents() {

shell = new Shell();

shell.setSize(450, 300);

shell.setText("BMI Calculator");

Label lblHeight = new Label(shell, SWT.NONE);

lblHeight.setBounds(10, 10, 82, 19);

lblHeight.setText("Height:");

text = new Text(shell, SWT.BORDER | SWT.RIGHT);

text.setBounds(70, 35, 64, 19);

Label lblFt = new Label(shell, SWT.NONE);

lblFt.setBounds(140, 35, 59, 14);

lblFt.setText("ft");

Label lblWeight = new Label(shell, SWT.NONE);

lblWeight.setBounds(10, 78, 59, 14);

lblWeight.setText("Weight:");

text_1 = new Text(shell, SWT.BORDER | SWT.RIGHT);

text_1.setBounds(70, 101, 64, 19);

Label lblLbs = new Label(shell, SWT.NONE);

lblLbs.setBounds(140, 101, 59, 14);

lblLbs.setText("lbs");

Label lblBmi = new Label(shell, SWT.NONE);

lblBmi.setBounds(10, 216, 59, 14);

lblBmi.setText("BMI:");

text_2 = new Text(shell, SWT.BORDER | SWT.RIGHT);

text_2.setBounds(70, 211, 64, 19);

Label lblObese = new Label(shell, SWT.NONE);

lblObese.setBounds(70, 254, 59, 14);

lblObese.setText("Obese");

text_3 = new Text(shell, SWT.BORDER | SWT.RIGHT);

text_3.setBounds(226, 35, 64, 19);

Label lblIn = new Label(shell, SWT.NONE);

lblIn.setBounds(296, 35, 59, 14);

lblIn.setText("in.");

Button btnCalculate = new Button(shell, SWT.NONE);

btnCalculate.addSelectionListener(new SelectionAdapter() {

@Override

public void widgetSelected(SelectionEvent e) {

}

});

btnCalculate.setBounds(226, 202, 94, 28);

btnCalculate.setText("Calculate");

Button btnClose = new Button(shell, SWT.NONE);

btnClose.addSelectionListener(new SelectionAdapter() {

@Override

public void widgetSelected(SelectionEvent e) {

}

});

btnClose.setBounds(321, 202, 94, 28);

btnClose.setText("Close");

}

}

BMI Calculator Height: ft in. Weight: lbs Calculate Close BMI: Obese