这个程序是一个三角计算程序。我有一个问题,它实际上出现在JFrame
. 我似乎无法确定错误。没关系我编辑的对象或涉及的任何数学。我还编辑了变量,所以这不是问题。我需要知道的是为什么面板没有出现。我猜它一定很小。
public class TrigCalcGUI extends JFrame implements ActionListener
{
public TrigCalcGUI()
{
// title bar text.
super("Trig Calculator");
// Corner exit button action.
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Object
//TrigCalc trC = new TrigCalc(sin, cos, tan);
// Create main panel to add each panel to
mainPanel = new JPanel();
// Assign Panel to each variable
inputPanel = new JPanel();
sinPanel = new JPanel();
cosPanel = new JPanel();
tanPanel = new JPanel();
cscPanel = new JPanel();
secPanel = new JPanel();
cotPanel = new JPanel();
buttonPanel = new JPanel();
// Call each constructor
buildInputPanel();
buildSinCosTanPanels();
buildCscSecCotPanels();
buildButtonPanel();
// Add each panel to content pane
mainPanel.add(inputPanel);
mainPanel.add(sinPanel);
mainPanel.add(cscPanel);
mainPanel.add(cosPanel);
mainPanel.add(secPanel);
mainPanel.add(tanPanel);
mainPanel.add(cotPanel);
mainPanel.add(buttonPanel);
// size of window to content
this.pack();
// display window
setVisible(true);
}
public static void main(String[] args)
{
new TrigCalcGUI();
}
private void buildInputPanel()
{
inputLabel = new JLabel("Enter a Value: ");
inputTF = new JTextField(5);
}
// Building Constructor for sinPanel
private void buildSinCosTanPanels()
{
// Set layout and border for sinPanel
sinPanel.setLayout(new GridLayout(1,2));
sinPanel.setBorder(BorderFactory.createTitledBorder("Sin()"));
//
sinLabel = new JLabel("Sin() of " + inputTF.getText() + " ");
sinTF = new JTextField(5);
sinTF.setEditable(false);
sinPanel.add(sinLabel);
sinPanel.add(sinTF);
// Set layout and border for cosPanel
cosPanel.setLayout(new GridLayout(1,2));
cosPanel.setBorder(BorderFactory.createTitledBorder("Cos()"));
cosLabel = new JLabel("Cos() of " + inputTF.getText() + " ");
cosTF = new JTextField(5);
cosTF.setEditable(false);
cosPanel.add(cosLabel);
cosPanel.add(cosTF);
// Set layout and border for tanPanel
tanPanel.setLayout(new GridLayout(1,2));
tanPanel.setBorder(BorderFactory.createTitledBorder("Tan()"));
tanLabel = new JLabel("Tan() of " + inputTF.getText() + " ");
tanTF = new JTextField(5);
tanTF.setEditable(false);
tanPanel.add(tanLabel);
tanPanel.add(tanTF);
}
// Building Constructor for cscPanel
private void buildCscSecCotPanels()
{
// Set layout and border for cscPanel
cscPanel.setLayout(new GridLayout(1,2));
cscPanel.setBorder(BorderFactory.createTitledBorder("Csc()"));
//
cscLabel = new JLabel("Csc() of " + inputTF.getText() + " ");
cscTF = new JTextField(5);
cscTF.setEditable(false);
cscPanel.add(cscLabel);
cscPanel.add(cscTF);
// Set layout and border for secPanel
secPanel.setLayout(new GridLayout(1,2));
secPanel.setBorder(BorderFactory.createTitledBorder("Sec()"));
secLabel = new JLabel("Sec() of " + inputTF.getText() + " ");
secTF = new JTextField(5);
secTF.setEditable(false);
secPanel.add(secLabel);
secPanel.add(secTF);
// Set layout and border for cotPanel
cotPanel.setLayout(new GridLayout(1,2));
cotPanel.setBorder(BorderFactory.createTitledBorder("Cot()"));
cotLabel = new JLabel("Cot() of " + inputTF.getText() + " ");
cotTF = new JTextField(5);
cotTF.setEditable(false);
cotPanel.add(cotLabel);
cotPanel.add(cotTF);
}
private void buildButtonPanel()
{
// Create buttons and add events
calcButton = new JButton("Calculate");
calcButton.addActionListener(new CalcButtonListener());
CancelButton = new JButton("Cancel");
CancelButton.addActionListener(new CancelButtonListener());
}
@Override
public void actionPerformed(ActionEvent e) {
}
private class CalcButtonListener implements ActionListener
{
public void actionPerformed(ActionEvent ae)
{
// Set input variable to input text field text
input = inputTF.getText();
// Assign double variables to double input
sin = Double.parseDouble(input);
cos = Double.parseDouble(input);
tan = Double.parseDouble(input);
csc = Double.parseDouble(input);
sec = Double.parseDouble(input);
cot = Double.parseDouble(input);
}
}
/**
* Private inner class that handles the event when
* the user clicks the Exit button.
*/
private class CancelButtonListener implements ActionListener
{
public void actionPerformed(ActionEvent ae)
{
// Exit the application.
System.exit(0);
}
}
}