如何在Button Click上使用JProgressBar

时间:2015-08-28 11:29:31

标签: java swing jframe jprogressbar

在gui中有两个字段在按钮点击时添加两个数字,并且有代码逻辑来检查字段是否为空但我想要的是当用户点击按钮时它应该根据毫秒进度显示进度条应该从1到100然后它完成任务并自动重置进度条。

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);

            }

        }

    }

}

1 个答案:

答案 0 :(得分:-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);

    }

}