java设置label背景色_java – 如何使用JSlider更改JLabel背景颜色

JSlider带有“ChangeListener”接口并处理“ChangeEvent”,当滑块值改变时,它将改变JLabel背景颜色.请帮助我,我无法做到这一点.

提前谢谢.我不能申请JLabel

package org.kodejava.example.swing;

import javax.swing.*;

import javax.swing.event.ChangeEvent;

import javax.swing.event.ChangeListener;

import java.awt.*;

public class JSliderDemo extends JPanel implements ChangeListener {

private JTextField field;

public JSliderDemo() {

initializeUI();

}

private void initializeUI() {

setLayout(new BorderLayout());

setPreferredSize(new Dimension(400, 100));

//

// Creates an instance of JSlider with a horizontal

// orientation. Define 0 as the minimal value and

// 50 as the maximum value. The initial value is set

// to 10.

//

JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 50, 10);

slider.setPaintTicks(true);

slider.setPaintLabels(true);

slider.setMinorTickSpacing(1);

slider.setMajorTickSpacing(10);

slider.addChangeListener(this);

JLabel label = new JLabel("The Value:");

field = new JTextField(5);

JPanel panel = new JPanel();

panel.setLayout(new FlowLayout());

panel.add(label);

panel.add(field);

add(slider, BorderLayout.NORTH);

add(panel, BorderLayout.SOUTH);

}

public void stateChanged(ChangeEvent e) {

JSlider slider = (JSlider) e.getSource();

//

// Get the selection value of JSlider

//

field.setText(String.valueOf(slider.getValue()));

}

public static void showFrame() {

JPanel panel = new JSliderDemo();

panel.setOpaque(true);

JFrame frame = new JFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setTitle("Slider Example");

frame.setContentPane(panel);

frame.pack();

frame.setVisible(true);

}

public static void main(String[] args) {

SwingUtilities.invokeLater(new Runnable() {

public void run() {

JSliderDemo.showFrame();

}

});

}

}