进度条 Java [英] Progress Bar Java

问题描述

我正在使用 JProgressBar 来显示进度.但是，如何将进度条显示为从 0 到 100 的加载?我从互联网上获得了代码，除了没有加载进度条之外，它的工作正常.

I am using JProgressBar to show progress. But, How to show the progressBar as loading from 0 to 100? I got the code from internet and its working except the progressBar is not loading.

代码

progressFrame = new JFrame(); // frame to display progress bar
progressBar = new JProgressBar(0,100);
progressBar.setValue(0);
progressBar.setStringPainted(true);
progressFrame.add(progressBar);

new SwingWorker<Void,Void>()
    {
        protected Void doInBackground() throws SQLException, ClassNotFoundException
        {
            Class.forName("oracle.jdbc.driver.OracleDriver");
            progressBar.setValue(0);
            frame.setEnabled(false); // frame = main frame

            //tableclass creates a JTable with data from database
            tableclass = new TheDatabaseTable(deptName);//it takes time to create
            progressBar.setValue(50);
            frame.getContentPane().removeAll();
            frame.setContentPane(tableclass);

            frame.validate();
            frame.repaint();

            progressBar.setValue(100);
            //progressFrame.dispose();
            return null;
        }; 
        protected void done()
        {
            //progressFrame.setVisible(false);
            frame.setVisible(true);
            progressFrame.dispose();
            frame.setEnabled(true);
        }

    }.execute();

如果有人编辑上述代码以使其正常工作，我将不胜感激.谢谢.

I would appreciate if anyone edit the above code to work. Thank you.

推荐答案

为此您必须使用线程.设计一个实现 Runnable 接口的类，它将像这样更新值.

You have to use threads for that. Design a class that implements Runnable interface which will update the values like this.

class ProgressBarUpdator implements java.lang.Runnable {

    /**
     * Progress bar that shows the current status
     */
    private javax.swing.JProgressBar jpb = null;
    /**
     * Progress bar value
     */
    private java.lang.Integer value = null;

    /**
     * Constructor
     * @param jpb The progress bar this has to update
     */
    public ProgressBarUpdator(javax.swing.JProgressBar jpb) {
        this.jpb = jpb;
        jpb.setMaximum(100);
    }

    /**
     * Sets the value to the progress bar
     * @param value Value to set
     */
    public void setValue(java.lang.Integer value) {
        this.value = value;
    }

    /**
     * Action of the thread will be executed here. The value of the progress bar will be set here.
     */
    public void run() {
        do {
            if (value != null) {
                jpb.setValue((int)java.lang.Math.round(java.lang.Math.floor(value.intValue() * 100 / maximum)));
            }
            try {
                java.lang.Thread.sleep(100L);
            } catch (java.lang.InterruptedException ex) {
                ex.printStackTrace();
            }
        } while (value == null || value.intValue() < jpb.getMaximum());
    }
}

在你的框架类中使用 progressBar 和这样的新类

and in your frame class use progressBar with the new class like this

ProgressBarUpdator ju = new ProgressBarUpdator(progressBar);
new java.lang.Thread(ju).start();

无论何时您想更改值，只需使用语句

Whenever you want to change the value just use the statement

ju.setValue([Value to set]);

这篇关于进度条 Java的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！