spring 2017 Problem5

package spring2017;

import producerConsumer.Producer;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Problem5 extends JFrame implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent e) {

        if(e.getSource()==button){

            try {

                 sum += Double.parseDouble(textField.getText());

            }
            catch (Exception f){
                sum =sum;
                JOptionPane.showMessageDialog(null, "Please enter valid number");
            }

            textField.setText("");

           labelSum.setText("Total Sale:"+Double.toString(sum));
        }
    }


    JLabel label, labelSum;
    JButton button;
    JTextField textField;


    double sum=0.0;

    Problem5(){

        setLayout(new FlowLayout());

        label = new JLabel("Enter sale");
        textField = new JTextField(20);
        button = new JButton("Record");
        labelSum = new JLabel("Total sales: "+sum);


        button.addActionListener(this);
        add(label);add(textField); add(button); add(labelSum);

        setSize(400,400);
        setVisible(true);

    }

    public static void main(String[] args) {


        new Problem5();

    }
}