JAVA问题..

public class CustomerEvent extends JApplet

{

JPanel panelObject;

JLabel labelCustName;

JLabel labelCustNo;

JLabel labelCustSex;

JLabel labelCustAge;

JButton buttonAccept;

JTextField textCustName;

JTextField textCustNo;

JComboBox comboCustSex;

JTextField textCustAge;

GridBagLayout gbObject;

GridBagConstraints gbc;

public void init()

{

gbObject = new GridBagLayout();

gbc = new GridBagConstraints();

panelObject = (JPanel)getContentPane();

panelObject.setLayout(gbObject);

buttonAccept = new JButton("Accept");

labelCustName = new JLabel("Customer Name");

labelCustNo = new JLabel("Customer Number");

labelCustSex = new JLabel("Sex");

labelCustAge = new JLabel("Age");

textCustName = new JTextField(5);

textCustNo = new JTextField(5);

textCustAge = new JTextField(10);

String Sex[] = { "Male","Female"};

comboCustSex = new JComboBox(Sex);

gbc.anchor = GridBagConstraints.NORTHWEST;

gbc.gridx = 1;

gbc.gridy = 5;

gbObject.setConstraints(labelCustName,gbc);

panelObject.add(labelCustName);

gbc.anchor = GridBagConstraints.NORTHWEST;

gbc.gridx = 4;

gbc.gridy = 5;

gbObject.setConstraints(textCustName,gbc);

panelObject.add(textCustName);

gbc.anchor = GridBagConstraints.NORTHWEST;

gbc.gridx = 1;

gbc.gridy = 8;

gbObject.setConstraints(labelCustNo,gbc);

panelObject.add(labelCustNo);

gbc.anchor = GridBagConstraints.NORTHWEST;

gbc.gridx = 4;

gbc.gridy = 8;

gbObject.setConstraints(textCustNo,gbc);

panelObject.add(textCustNo);

gbc.anchor = GridBagConstraints.NORTHWEST;

gbc.gridx = 1;

gbc.gridy = 11;

gbObject.setConstraints(labelCustSex,gbc);

panelObject.add(labelCustSex);

gbc.anchor = GridBagConstraints.NORTHWEST;

gbc.gridx = 4;

gbc.gridy = 11;

gbObject.setConstraints(comboCustSex,gbc);

panelObject.add(comboCustSex);

gbc.anchor = GridBagConstraints.NORTHWEST;

gbc.gridx = 1;

gbc.gridy = 14;

gbObject.setConstraints(labelCustAge,gbc);

panelObject.add(labelCustAge);

gbc.anchor = GridBagConstraints.NORTHWEST;

gbc.gridx = 4;

gbc.gridy = 14;

gbObject.setConstraints(textCustAge,gbc);

panelObject.add(textCustAge);

gbc.anchor = GridBagConstraints.NORTHEAST;

gbc.gridx = 5;

gbc.gridy = 17;

gbObject.setConstraints(buttonAccept,gbc);

panelObject.add(buttonAccept);

ValidateAction validateButton = new ValidateAction();

buttonAccept.addActionListener(validateButton);

}

class ValidateAction implements ActionListener

{

public void actionPerformed(ActionEvent evt)

{

Object obj = evt.getSource();

if(obj == buttonAccept)

{

String customerNo = textCustNo.getText();

if(customerNo.length() == 0)

{

getAppletContext().showStatus("Customer Number cannot be empty");

return;

}

}

}

}

}

可能 String 类名有冲突了

用 String 的时候也用显示

java.lang.String Sex[] = { "Male","Female"};

java.lang.String customerNo = textCustNo.getText();

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