我已经为此工作了两天，但我仍然无法弄清楚。
所以我有这些课程：
MyContentPane
参数面板
控制面板
第一类看起来像这样：
public class MyContentPane extends JPanel{
private ParametersPanel parametersPanel;
private ControlsPanel controlPanel;
private CashRegistersPanel cashRegistersPanel;
public MyContentPane() {
parametersPanel = new ParametersPanel();
controlPanel = new ControlsPanel(parametersPanel);
cashRegistersPanel = new CashRegistersPanel();
this.setLayout(null);
this.add(controlPanel);
this.add(parametersPanel);
this.add(cashRegistersPanel);
controlPanel.setBounds(0, 0, 300, 250);
parametersPanel.setBounds(0, 250, 300, 450);
cashRegistersPanel.setBounds(300, 0, 1500, 700);
this.setPreferredSize(new Dimension(1800,700));
}
}
第二类看起来像这样：
public class ParametersPanel extends JPanel{
private ControlsPanel controlsPanel;
private JButton reset;
public ParametersPanel() {
controlsPanel = new ControlsPanel(this);
this.setBackground(new Color(219,221,255));
reset = new JButton("Reset parameters");
reset.setFont(new Font("Arial", Font.BOLD, 14));
this.setLayout(null);
this.add(reset);
reset.setBounds(10, 245, 280, 30);
reset.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
boolean startIsPressed = controlsPanel.StartisPressed();
System.out.println("Boolean: " + startIsPressed);
}
});
}
最后一类是：
public class ControlsPanel extends JPanel{
private JButton start;
private JButton stop;
private boolean startIsPressed;
public ControlsPanel(final ParametersPanel panel) {
start = new JButton("Start");
stop = new JButton("Stop");
start.setFont(new Font("Arial", Font.BOLD, 14));
stop.setFont(new Font("Arial", Font.BOLD, 14));
this.setLayout(null);
this.setBackground(new Color(199,202,255));
this.add(start);
this.add(stop);
start.setBounds(10, 10, 280, 30);
stop.setBounds(10, 50, 280, 30);
stop.setEnabled(false);
start.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
if (start.getText().equals("Start")) {
start.setText("Pause");
stop.setEnabled(true);
startIsPressed = true;
System.out.println("Start Button boolean value: " + startIsPressed + stringStartIsPressed);
}
});
public boolean StartisPressed() {
return startIsPressed;
}
现在的问题是，一旦按下ControlsPanel中的“开始”按钮，布尔值就会变成true。但是，当我通过按下重置按钮在ParametersPanel中询问此布尔值时，它返回false。我发现如果我在第一类（MyContentPane）中更改面板清算的顺序，就可以解决问题，但是我不能在ControlsPanel中要求布尔值...
添加了另一堂课
public class CashRegistersPanel extends JPanel{
private Image img;
private int amount;
private ParametersPanel parametersPanel;
private ControlsPanel controlsPanel;
private boolean startIsPressed;
public CashRegistersPanel() {
parametersPanel = new ParametersPanel();
startIsPressed = controlsPanel.StartisPressed();
this.setBackground(new Color(237,237,237));
this.setLayout(null);
CashRegister cashRegister = new CashRegister();
img = cashRegister.getImg();
amount = parametersPanel.getAmountOfRegisters();
}
public void setControlsPanel(ControlsPanel cp) {
controlsPanel = cp;
}
我按照你们的建议更改了MyContentPane并添加了更多内容：
public class MyContentPane extends JPanel{
private ParametersPanel parametersPanel;
private ControlsPanel controlPanel;
private CashRegistersPanel cashRegistersPanel;
public MyContentPane() {
parametersPanel = new ParametersPanel();
controlPanel = new ControlsPanel(parametersPanel);
parametersPanel.setControlsPanel(controlPanel);
cashRegistersPanel = new CashRegistersPanel(parametersPanel, controlPanel);
谢谢大家，问题解决了！
最佳答案
您要创建2个ControlsPanel。
不应该在ParametersPanel中创建一个，这是令人反感的行：
controlsPanel = new ControlsPanel(this);
而是在ParametersPanel上创建一个setter方法：
public void setControlsPanel(ControlsPanel cp) {
controlsPanel = cp;
}
并将第一类中的初始化更改为：
parametersPanel = new ParametersPanel();
controlPanel = new ControlsPanel(parametersPanel);
parametersPanel.setControlsPanel(controlPanel); // <- new line
cashRegistersPanel = new CashRegistersPanel();