Java Swing滑块标签不根据滑块最小/最大值更新

当滑块的最小值和最大值发生变化时，我的JSlider上的标签表不会根据滑块的最小值和最大值进行更新。当getMinimum（）和getMaximum（）方法返回正确的值时，将正确更新最小值/最大值。滑块下方的自动标签显示不正确的值

下面是这个问题的一个独立示例。代码主要由Eclipse窗口生成器/Swing设计器自动生成

按下滑块两侧的按钮可更改滑块的最大值

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;

import java.awt.BorderLayout;

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

import javax.swing.JButton;
import javax.swing.JSlider;
import javax.swing.JLabel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class SliderTrouble implements ActionListener
{

    private JFrame frame;
    private JSlider slider;
    private JLabel lblMin;
    private JLabel lblMax;
    private JLabel lblCurrent;
    private int sliderMax = 100;
    private int sliderMajorSpacing = sliderMax / 4;

    /**
     * Launch the application.
     */
    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                try
                {
                    SliderTrouble window = new SliderTrouble();
                    window.frame.setVisible(true);
                } catch (Exception e)
                {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public SliderTrouble()
    {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize()
    {
        frame = new JFrame();
        frame.setTitle("Slider problems");
        frame.setBounds(100, 100, 481, 122);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(new BorderLayout(0, 0));

        JPanel panel = new JPanel();
        frame.getContentPane().add(panel, BorderLayout.CENTER);

        JButton btnNewButton = new JButton("100");
        btnNewButton.setBounds(10, 22, 64, 23);
        btnNewButton.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                System.out.println("Pressed 100. Since this is the default value, everything is ok.");
                sliderMax = 100;
                sliderMajorSpacing = sliderMax / 4;
                changeSlider(sliderMax, sliderMajorSpacing);
            }
        });
        panel.setLayout(null);
        panel.add(btnNewButton);

        class SliderListener implements ChangeListener
        {
            public void stateChanged(ChangeEvent e)
            {
                JSlider slider = (JSlider) e.getSource();
                if (slider.getValueIsAdjusting())
                {
                    updateCurrent(slider.getValue());
                }
            }
        }

        slider = new JSlider();
        slider.setBounds(79, 11, 300, 45);
        slider.setMajorTickSpacing(sliderMajorSpacing);
        slider.setPaintTicks(true);
        slider.setPaintLabels(true);
        slider.setMaximum(sliderMax);
        slider.addChangeListener(new SliderListener());
        panel.add(slider);

        JButton btnNewButton_1 = new JButton("196");
        btnNewButton_1.setBounds(389, 22, 62, 23);
        btnNewButton_1.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                System.out.println("Pressed 196. The actual minimum and maximum values are updated correctly. getValue gets the correct value. The little gray tick lines are not updated accordingly. The text labels are done according to the default (button '100') settings, showing a max at 175 instead of 196. 175 is the closest multiple of 25 (which is the default major tick space).");
                sliderMax = 196;
                sliderMajorSpacing = sliderMax / 4;
                changeSlider(sliderMax, sliderMajorSpacing);
            }
        });

        panel.add(btnNewButton_1);

        JPanel panel_1 = new JPanel();
        frame.getContentPane().add(panel_1, BorderLayout.SOUTH);

        JLabel lblSliderMin = new JLabel("Slider min:");
        panel_1.add(lblSliderMin);

        lblMin = new JLabel();
        lblMin.setText(String.valueOf(slider.getMinimum()));
        panel_1.add(lblMin);

        JLabel lblMax_1 = new JLabel("max:");
        panel_1.add(lblMax_1);

        lblMax = new JLabel();
        lblMax.setText(String.valueOf(slider.getMaximum()));
        panel_1.add(lblMax);

        JLabel lblCur = new JLabel("current:");
        panel_1.add(lblCur);

        lblCurrent = new JLabel();
        lblCurrent.setText(String.valueOf(slider.getValue()));
        panel_1.add(lblCurrent);

        //frame.pack();
    }

    private void changeSlider(int max, int majspace)
    {
        slider.setMajorTickSpacing(majspace);
        slider.setMaximum(max);

        System.out.println("max: " + max + " major: " + sliderMajorSpacing);

        updateText(slider.getMinimum(), slider.getMaximum(), slider.getValue());
    }

    private void updateText(int minimum, int maximum, int value)
    {
        lblMin.setText(String.valueOf(minimum));
        lblMax.setText(String.valueOf(maximum));
        lblCurrent.setText(String.valueOf(value));
    }

    private void updateCurrent(int value)
    {
        lblCurrent.setText(String.valueOf(value));
    }

    public void actionPerformed(ActionEvent arg0)
    {   
    }
}

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在具有先前标签集的滑块上调用时，

setMajorTickSpacing（）

实际上不会更新任何内容。这可以通过打电话来解决

slider.setLabelTable(null);

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在设置新的刻度间距以强制重新创建标签之前。

您希望标签显示什么？刻度间距为25，因此在196长范围内可以显示的最大刻度间距为175。主要刻度间距在changeSlider方法中更改，该方法在按下其中一个按钮时调用。我希望标签会随着刻度间距的变化而变化。我可以发誓我试过了。这就解决了问题。非常感谢。