BMI calculator java | GUI

What is BMI:

Body Mass Index (BMI) is a measurement of a person’s weight with respect to his or her height. It is more of an indicator than a direct measurement of a person’s total body fat.

BMI, more often than not, correlates with total body fat. This means that as the BMI score increases, so does a person’s total body fat.

BMI calculation:

The Body Mass Index is the body mass in kilogram divided by the square of body height in meters. This is expressed as kg/m^2.

The WHO defines an adult who has a BMI between 25 and 29.9 as overweight - an adult who has a BMI of 30 or higher is considered obese - a BMI below 18.5 is considered underweight, and between 18.5 to 24.9 a healthy weight .

This is an example of a BMI calculator in Java with a simple graphic interface + search and listing feature:

Source code:

	import javax.swing.* ;
	import java.awt.* ;
	import java.awt.event.ActionEvent;
	import java.awt.event.ActionListener;
	import java.util.regex.Pattern;
	import javax.swing.border.TitledBorder;
	import javax.swing.event.DocumentEvent;
	import javax.swing.event.DocumentListener;
	import javax.swing.table.DefaultTableModel;
	import javax.swing.table.TableColumn;
	public class BMI {
	public static void main(String[] args) {
	JFrame window = new JFrame("IHM Project");
	window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	window.setSize(1000,600);
	window.setResizable(false);
	JPanel pan = new JPanel();
	JPanel pan1 = new JPanel();
	pan.setLayout(null);
	pan1.setLayout(null);
	window.setContentPane(pan);
	pan.add(pan1);
	TitledBorder panTitle = new TitledBorder(" Insert info ") ;
	TitledBorder winTitle = new TitledBorder(" Body Mass Index ") ;
	panTitle.setTitleJustification(TitledBorder.CENTER);
	winTitle.setTitleJustification(TitledBorder.CENTER);
	pan.setBorder(winTitle);
	pan1.setBackground(Color.LIGHT_GRAY);
	pan1.setBounds(50,50,200,400);
	pan1.setBorder(panTitle);
	JButton addBtn = new JButton ("Add");
	addBtn.setBounds(30,370,150,20);
	JButton delete = new JButton ("Delete");
	pan.add(delete);
	delete.setBounds(670,470,150,20);
	JTextField name = new JTextField() ;
	name.setBounds(40,40,120,20);
	JTextField Lname = new JTextField();
	Lname.setBounds(name.getLocation().x,name.getLocation().x+40,120,20);
	pan1.add(addBtn);
	pan1.add(name);
	pan1.add(Lname);
	JTextField search = new JTextField();
	pan.add(search);
	JLabel txt = new JLabel ("Insert :");
	JLabel FName = new JLabel ("First Name :");
	JLabel LName = new JLabel ("Last Name :");
	JLabel sexe = new JLabel ("Gander :");
	JLabel bd = new JLabel ("Age :");
	JLabel field = new JLabel ("Height : (m)");
	JLabel field2 = new JLabel ("Weight :(Kg)");
	JLabel searchLab = new JLabel ("Search :");
	pan.add(searchLab);
	searchLab.setBounds(delete.getLocation().x-320,delete.getLocation().y , delete.getSize().width,delete.getSize().height);
	search.setBounds(searchLab.getLocation().x+80,searchLab.getLocation().y , name.getSize().width,name.getSize().height);
	JSpinner aut = new JSpinner(new SpinnerNumberModel(1.50,null,null,0.01));
	pan1.add(aut);
	JSpinner poid = new JSpinner(new SpinnerNumberModel(55,40,null,1));
	pan1.add(poid);
	pan1.add(bd);
	pan1.add(field);
	pan1.add(field2);
	pan1.add(sexe);
	JRadioButton male = new JRadioButton("male");
	JRadioButton female = new JRadioButton("female");
	ButtonGroup gander = new ButtonGroup();
	JSpinner age = new JSpinner(new SpinnerNumberModel(19,18,65,1));
	pan1.add(age);
	age.setBounds(40,240,Lname.getSize().width,Lname.getSize().height+10);
	field.setBounds(age.getLocation().x,age.getLocation().y+40,Lname.getSize().width,Lname.getSize().height+10);
	field2.setBounds(age.getLocation().x+70,age.getLocation().y+40,(Lname.getSize().width)+10/2,Lname.getSize().height+10);
	aut.setBounds(field.getLocation().x,field.getLocation().y+30,(Lname.getSize().width)/2,Lname.getSize().height+10);
	poid.setBounds(field.getLocation().x+70,field.getLocation().y+30,(Lname.getSize().width)/2,Lname.getSize().height+10);
	bd.setBounds(age.getLocation().x,age.getLocation().y-30,Lname.getSize().width,Lname.getSize().height+10);
	gander.add(male);
	gander.add(female);
	pan1.add(male);
	pan1.add(female);
	male.setBounds(Lname.getLocation().x , Lname.getLocation().y+60,Lname.getSize().width,Lname.getSize().height+10);
	female.setBounds(Lname.getLocation().x , Lname.getLocation().y+85,Lname.getSize().width,Lname.getSize().height+10);
	FName.setBounds(name.getLocation().x , name.getLocation().y-20,name.getSize().width,name.getSize().height);
	LName.setBounds(Lname.getLocation().x , Lname.getLocation().y-20,Lname.getSize().width,Lname.getSize().height);
	sexe.setBounds(male.getLocation().x , male.getLocation().y-30,Lname.getSize().width,Lname.getSize().height+10);
	pan1.add(FName);
	pan1.add(LName);
	JLabel copyright = new JLabel("----- All Rights Reserved © TP de IHM -----");
	copyright.setBounds(350,545,300,20);
	pan.add(copyright,BorderLayout.PAGE_END);
	JPanel pan2 = new JPanel () ;
	pan2.setBounds(50,50,300,400);
	pan2.setBounds(pan1.getLocation().x+300,pan1.getLocation().x,500,pan1.getSize().height);
	pan2.setBorder(BorderFactory.createLineBorder(Color.black));
	pan.add(pan2);
	String[] columns = {"First Name","Last Name","Age","Gander","BMI","Note"};
	DefaultTableModel model = new DefaultTableModel(columns,0);
	JTable table = new JTable(model);
	JScrollPane scrollPane = new JScrollPane(table);
	scrollPane.setVisible(true);
	pan2.add(scrollPane);
	TableColumn column= null ;
	for (int i = 0; i < 6; i++) {
	column = table.getColumnModel().getColumn(i);
	if (i == 2) {
	column.setPreferredWidth(100); //third column is bigger
	} else {
	column.setPreferredWidth(75);
	}
	}
	Object data1 [] = {
	"mendja",
	"wadie",
	"20",
	"male",
	"25.0",
	"Overweight",
	} ;
	model.addRow(data1);
	table.setFont(new Font("Times New Roman", Font.PLAIN, 13));
	table.setFillsViewportHeight(true);
	pan2.add(table.getTableHeader(),BorderLayout.NORTH);
	pan2.add(table,BorderLayout.CENTER);
	pan2.setBackground(Color.GRAY);
	addBtn.addActionListener(new ActionListener (){
	@Override
	public void actionPerformed(ActionEvent e) {
	double bmi = Double.parseDouble(poid.getValue().toString())/Math.pow(Double.parseDouble(aut.getValue().toString()),2);
	String BMI = String.format("%1$,.2f", bmi);
	if (name.getText()!="" && Lname.getText()!="" &&( male.isSelected() || female.isSelected())) {
	String gander ;
	if (male.isSelected()) gander = male.getText();else gander = female.getText();
	String remarque ;
	if (bmi >= 25.0) remarque = "Overweight" ; else if(bmi>=18.50 && bmi<=24.9) remarque = "Healthy";
	else remarque = "Underweight" ;
	Object data [] = {
	name.getText(),
	Lname.getText(),
	age.getValue(),
	gander,
	BMI,
	remarque
	};
	model.addRow(data);
	}else JOptionPane.showMessageDialog(null, "You must complete the formula !!");
	}
	});
	search.getDocument().addDocumentListener(new DocumentListener () {
	@Override
	public void insertUpdate(DocumentEvent e) {
	for (int i =0 ; i<model.getRowCount();i++) {
	if (Pattern.matches((String)search.getText(),(String) model.getValueAt(i,0))) {
	//System.out.println(model.getValueAt(i,j));
	table.setRowSelectionInterval(i,i);
	break;
	}else if (Pattern.matches((String)search.getText(),(String) model.getValueAt(i,1))) {
	//System.out.println(model.getValueAt(i,j));
	table.setRowSelectionInterval(i,i);
	break;
	}
	}
	}
	@Override
	public void removeUpdate(DocumentEvent e) {
	table.clearSelection();
	}
	@Override
	public void changedUpdate(DocumentEvent e) {
	table.clearSelection();
	}
	});
	delete.addActionListener(new ActionListener () {
	@Override
	public void actionPerformed(ActionEvent e) {
	int count =0 ;
	for (int i =0 ; i<model.getRowCount();i++) {
	if (table.isRowSelected(i)) {
	count++ ;
	}
	}
	if (count ==0) {
	JOptionPane.showMessageDialog(null, "Select to delete");
	}else
	((DefaultTableModel)table.getModel()).removeRow(table.getSelectedRow());
	}
	});
	window.setVisible(true);
	}
	}

view raw BMI.java hosted with ❤ by GitHub