JSlider旋钮未更新（基本Java）

Question

我正在Java中实现一个简单的水平JSlider。没有刻度线之类的东西。可能是人类所能想象的那么简单。

当我试图通过鼠标拖动JSlider左右“移动”它时，它的数值确实会更新（我设置了system.outprint语句来报告滑块的变化值，这些值看起来很好）。

Answer 1

对我来说似乎工作得很好，请贴SSCCE来显示具体的问题：

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class SwingSliderExample extends JPanel {

    public SwingSliderExample() {

        super(true);
        this.setLayout(new BorderLayout());
        final JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 50, 25);

        slider.setMinorTickSpacing(2);
        slider.setMajorTickSpacing(10);
        slider.setPaintTicks(true);
        slider.setPaintLabels(true);

        // We'll just use the standard numeric labels for now...
        slider.setLabelTable(slider.createStandardLabels(10));

        slider.addChangeListener(new ChangeListener() {
            @Override
            public void stateChanged(ChangeEvent ce) {
                if (!slider.getValueIsAdjusting()) {//no adjustments are taking place thus we know the value is final
                    System.out.println(slider.getValue());
                }
            }
        });

        add(slider, BorderLayout.CENTER);
    }

    public static void main(String s[]) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
                        if ("Nimbus".equals(info.getName())) {
                            UIManager.setLookAndFeel(info.getClassName());
                            break;
                        }
                    }
                } catch (Exception e) {
                    // If Nimbus is not available, you can set the GUI to another look and feel.
                }
                JFrame frame = new JFrame("Slider Example");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new SwingSliderExample());
                frame.pack();
                frame.setVisible(true);
            }
        });
    }
}

参考：

• http://www.java2s.com/code/java/swing-jfc/anexampleofjsliderwithdefaultlabels.htm