How to Use JProgressBar on Button Click

Question

In gui there are two fields which add two numbers on button click and there is code logic to check if the fields are empty but what i want is when user click on the button it should display a progress bar according to milliseconds progress should go from 1 to 100 then it complete the task and auto reset the progress bar.

public class Main {

    public static void main(String[] args) {

        Progress pg = new Progress();


    }

}

public class Progress extends JFrame implements ActionListener {

    private JTextField t1;
    private JTextField t2;
    private JTextField t3;
    private JButton b1;
    private JProgressBar bar;
    Timer t;
    int interval = 1000;
    int i = 0;

    public Progress() {
        setLayout(new FlowLayout());

        t1 = new JTextField(20);
        t2 = new JTextField(20);
        t3 = new JTextField(20);

        b1 = new JButton("OK");
        b1.addActionListener(this);

        t = new Timer(interval, this);

        bar = new JProgressBar();
        bar.setStringPainted(true);
        bar.setValue(0);

        add(t1);
        add(t2);
        add(t3);
        add(b1);
        add(bar);

        setSize(600, 480);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setVisible(true);

    }

    @Override
    public void actionPerformed(ActionEvent e) {

        if (e.getSource() == b1) {

            if (t1.getText().isEmpty() || t2.getText().isEmpty()) {

                JOptionPane.showMessageDialog(null, "Empty Fields");
            }

            else {
                int w = Integer.parseInt(t1.getText());
                int x = Integer.parseInt(t2.getText());
                int res = w + x;
                t3.setText("" + res);

            }

        }

    }

}

Ok. What's your question or problem? – Spikatrix Aug 28 '15 at 12:15 — Spikatrix, Aug 28 '15 at 12:15

FullStack · Answer 1 · 2015-08-28T12:36:59.007

-1

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JProgressBar;
import javax.swing.JTextField;

@SuppressWarnings("serial")
public class Progress extends JFrame implements ActionListener {

    private JTextField t1;
    private JTextField t2;
    private JTextField t3;
    private JButton b1;
    JProgressBar progressBar;
    int i = 0;

    public Progress() {

        setLayout(new FlowLayout());

        t1 = new JTextField(20);
        t2 = new JTextField(20);
        t3 = new JTextField(20);

        b1 = new JButton("OK");
        b1.addActionListener(this);

        progressBar = new JProgressBar(1, 100);
        progressBar.setValue(0);
        progressBar.setStringPainted(true);
        progressBar.setForeground(Color.GRAY);
        progressBar.setBackground(Color.white);

        add(t1);
        add(t2);
        add(t3);
        add(b1);
        add(progressBar);

        setSize(600, 480);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setVisible(true);

    }

    @Override
    public void actionPerformed(ActionEvent e) {

        int i = 0;
        if (e.getSource() == b1) {
            progressBar.setVisible(true);
            if (t1.getText().isEmpty() || t2.getText().isEmpty()) {
                JOptionPane.showMessageDialog(null, "Empty Fields");
                System.exit(0);
            } else {
                try {
                    while (i <= 100) {

                        int w = Integer.parseInt(t1.getText());
                        int x = Integer.parseInt(t2.getText());
                        int res = w + x;
                        t3.setText("" + res);

                        Thread.sleep(50);
                        progressBar.paintImmediately(0, 0, 200, 200);
                        progressBar.setValue(i);
                        i++;
                    }
                } catch (Exception e1) {
                    System.out.print("Exception =" + e1);
                }
                progressBar.setValue(0);
            }
        }

    }

    public static void main(String[] args) {
        Progress p = new Progress();
        p.setVisible(true);

    }

}

edited Aug 28 '15 at 12:36

answered Aug 28 '15 at 11:39

FullStack

665
11
26

Check if it helps...? – FullStack Aug 28 '15 at 11:43
Code only answers are discouraged. Please explain the changes that you did. – Spikatrix Aug 28 '15 at 12:16
@Maximus Decimus Meridius when it click it does not perfom action at real seconds – Aug 28 '15 at 12:16
@JohnDoe Hello John, i just helped you out to display progress bar, please update your logic as per your requirement. – FullStack Aug 28 '15 at 12:19
@Maximus Decimus Meridius why you didn't use Timer – Aug 28 '15 at 12:22
If nothing is entered in the two textfields `t1` and `t2`, the code displays the joptionpane 100 times. Also, you call `setvisible` twice. Once from main and once from the constructor. – Spikatrix Aug 28 '15 at 12:24
@JohnDoe John,you can use timer also. This is for your reference : http://stackoverflow.com/questions/15668715/how-to-use-the-swing-timer-to-delay-the-loading-of-a-progress-bar – FullStack Aug 28 '15 at 12:25
@CoolGuy Hello CoolGuy,It is just code modification in John's logic. He will modify it as per his requirement. – FullStack Aug 28 '15 at 12:27
@CoolGuy yes the issue occur – Aug 28 '15 at 12:28
@Maximus Decimus Meridius could you tell me what these two steps do.Thread.sleep(50); bar.paintImmediately(0, 0, 200, 200); – Aug 28 '15 at 12:34
@JohnDoe(1) Thread.sleep(50) : It will cease the execution of current thread for specified milliseconds. (2) bar.paintImmediately(0,0,200,200) will paint the specified region in component. – FullStack Aug 28 '15 at 12:41
@JohnDoe Hope , you are now clear with it ? I have modified the answer a bit. – FullStack Aug 28 '15 at 12:44

How to Use JProgressBar on Button Click

1 Answers1