【发布时间】：2012-12-03 06:40:13
【问题描述】：
所以我有一个明天到期的程序，只要我能找出我的代码有什么问题，我就会坚持下去。第一个也是最大的问题让我沉默了一段时间是我的重置按钮动作监听器。它只是无法正确编译并说找不到值？我把它注释掉了，所以我至少可以运行你应该能够清楚地看到我注释掉它们的地方的程序。第二个问题是我必须让一个文本字段在移动它们时显示两个滑块之间的 MAX 值，另一个给我两个滑块之间的 TOTAL 值。老实说，我不知道该怎么做，只是简单地将两个 jtextfields 附加到左侧滑块。为此，我将不胜感激朝着正确的方向前进？如果您给我代码，我将不胜感激，但我也想解释它为什么有效/我的代码有什么问题。谢谢！
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
/**
This class displays a window with a slider component.
The user can slide the left or right slider. As the
sliders are adjusted it displays the maximum sound
level coming from either slider as well as the total.
*/
public class SoundLevels extends JFrame
{
private JLabel label1, label2, label3, label4; // Message labels
private JTextField maxSound; // Max Sound Level
private JTextField totalSound; // Total Sound Level
private JPanel mpanel; // Max sound level panel
private JPanel tpanel; // Total sound level panel
private JPanel sliderPanel1; // Slider panel 1
private JPanel sliderPanel2; // Slider panel 2
private JPanel resetpanel; // Reset button panel
private JSlider slider1; // Left sound adjuster
private JSlider slider2; // Right sound adjuster
private JButton resetButton; // Reset button
/**
Constructor
*/
public SoundLevels()
{
// Set the title.
setTitle("Sound Levels");
// Specify an action for the close button.
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Creates reset button
resetButton = new JButton("Reset");
// Create the message labels.
label1 = new JLabel("Left: ");
label2 = new JLabel("Right: ");
label3 = new JLabel("Max: ");
label4 = new JLabel("Total: ");
// Create the read-only text fields.
maxSound = new JTextField("0", 10);
maxSound.setEditable(false);
totalSound = new JTextField("0", 10);
totalSound.setEditable(false);
// Create the slider.
slider1 = new JSlider(JSlider.HORIZONTAL, 0, 100, 0);
slider2 = new JSlider(JSlider.HORIZONTAL, 0, 100, 0);
slider1.addChangeListener(new SliderListener());
// Create panels and place the components in them.
mpanel = new JPanel();
resetpanel = new JPanel();
tpanel = new JPanel();
sliderPanel1 = new JPanel();
sliderPanel2 = new JPanel();
//Add components to panels
mpanel.add(label1);
mpanel.add(maxSound);
tpanel.add(label2);
tpanel.add(totalSound);
sliderPanel1.add(label1);
sliderPanel1.add(slider1);
sliderPanel2.add(label2);
sliderPanel2.add(slider2);
resetpanel.add(resetButton);
// Initialize event listener
// resetButton.addActionListener(new ResetButtonListener());
// Sets window to a border layout format.
setLayout(new GridLayout(1, 5));
// Add the panels to the content pane.
add(sliderPanel1);
add(sliderPanel2);
add(resetpanel);
add(mpanel);
add(tpanel);
// Pack and display the frame.
pack();
setVisible(true);
}
/**
Private inner class that handles the event when
the user clicks the Reset button.
*/
/* COMMENTED THIS OUT SO IT AT LEAST RUNS
private class ResetButtonListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
// Set the panel's background to red.
max = 0; //should reset sliders to 0
total = 0; //should reset sliders to 0
}
}
*/
/**
Private inner class to handle the change events
that are generated when the slider is moved.
*/
private class SliderListener implements ChangeListener
{
public void stateChanged(ChangeEvent e)
{
int max, total;
// Get the slider value.
max = slider1.getValue();
total = slider1.getValue();
// Store the total sound level in its display field.
totalSound.setText(Integer.toString(total));
// Store the max sound level in its display field.
maxSound.setText(Integer.toString(max));
}
}
/*
The main method creates an instance of the
class, which displays a window with a slider.
*/
public static void main(String[] args)
{
new SoundLevels();
}
}
【问题讨论】：
-
我在问为什么动作监听器没有首先工作。然后我要求推动滑块值的正确方向。不会说我不想要代码，但我没有说全部编码并给我。我尽可能礼貌地寻求帮助？对不起，如果你觉得是我让你做我的作业。
-
可以理解。我不会拖延为什么我现在才寻求帮助，但是我的问题是：“我的动作私有 resetbutton 侦听器类有什么问题？我在 jbuttons 及其动作的不同程序上有完全相同的编码听众，他们运行得很好。我不明白为什么它在编译时给我一个错误。介意告诉我是什么导致了这个错误，以便我可以修复它？谢谢”
标签： java swing jbutton jtextfield jslider