我是 Java 新手，出于某種原因，我不知道在按下提交后有任何其他方法可以從另一個框架傳輸資料。例如，它會將用戶在第一幀中撰寫的標簽和文本欄位顯示在輸出幀中，如“名稱：”用戶名“。如果你知道請貼出我應該放的代碼，謝謝！
package eventdriven;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class EventDriven extends JFrame {
JPanel items = new JPanel();
JLabel fName = new JLabel("First Name: ");
JLabel lName = new JLabel("Last Name: ");
JLabel mName = new JLabel("Middle Name: ");
JLabel mNum = new JLabel("Mobile Number: ");
JLabel eAdd = new JLabel("Email Address: ");
JTextField fname = new JTextField(15);
JTextField lname = new JTextField(15);
JTextField mname = new JTextField(15);
JTextField mnum = new JTextField(15);
JTextField eadd = new JTextField(15);
JButton submit = new JButton("Submit");
JButton clear = new JButton("Clear All");
JButton okay = new JButton("Okay");
JTextArea infos;
JFrame output;
public EventDriven()
{
this.setTitle("INPUT");
this.setResizable(false);
this.setSize(230, 300);
this.setLocation(300, 300);
this.setLayout(new FlowLayout(FlowLayout.CENTER));
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.add(fName);
this.add(fname);
this.add(lName);
this.add(lname);
this.add(mName);
this.add(mname);
this.add(mNum);
this.add(mnum);
this.add(eAdd);
this.add(eadd);
submit.addActionListener(new btnSubmit());
this.add(submit);
clear.addActionListener(new btnClearAll());
this.add(clear);
okay.addActionListener(new btnOkay());
this.add(items);
this.setVisible(true);
}
class btnSubmit implements ActionListener{
@Override
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == submit)
{
submit.setEnabled(false);
output = new JFrame("OUTPUT");
output.show();
output.setSize(300,280);
output.setTitle("OUTPUT");
output.add(okay);
output.setLayout(new FlowLayout(FlowLayout.CENTER));
}
}
}
class btnClearAll implements ActionListener{
@Override
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == clear)
{
fname.setText(null);
lname.setText(null);
mname.setText(null);
mnum.setText(null);
eadd.setText(null);
submit.setEnabled(true);
output.dispose();
}
}
}
class btnOkay implements ActionListener{
@Override
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == okay)
{
fname.setText(null);
lname.setText(null);
mname.setText(null);
mnum.setText(null);
eadd.setText(null);
submit.setEnabled(true);
output.dispose();
}
}
}
public static void main(String[] args)
{
EventDriven window = new EventDriven();
}
}
uj5u.com熱心網友回復：
不清楚您在另一幀中顯示一個欄位的值時遇到了什么問題。但這里有一個這樣做的例子（為了演示，欄位減少到一個）：
public class EventDriven extends JFrame {
private final JTextField nameField = new JTextField(15);
private final JButton submit = new JButton("Submit");
private final JButton clear = new JButton("Clear All");
public EventDriven() {
setTitle("Input");
setLayout(new FlowLayout(FlowLayout.CENTER));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
add(new JLabel("Name: "));
add(nameField);
submit.addActionListener(this::showOutput);
add(submit);
clear.addActionListener(this::clearInput);
add(clear);
pack();
}
private void showOutput(ActionEvent ev) {
submit.setEnabled(false);
JDialog output = new JDialog(EventDriven.this, "Output", true);
output.add(new Label("Name: " nameField.getText()), BorderLayout.CENTER);
JButton okButton = new JButton("OK");
output.add(okButton, BorderLayout.SOUTH);
okButton.addActionListener(bv -> output.setVisible(false));
output.pack();
output.setVisible(true);
}
private void clearInput(ActionEvent ev) {
nameField.setText(null);
submit.setEnabled(true);
}
public static void main(String[] args) {
EventDriven window = new EventDriven();
window.setVisible(true);
}
}
您還將看到我已經簡化了您的動作偵聽器，以演示一種更簡單的方法來回應用戶驅動的 event.s
uj5u.com熱心網友回復：
您需要使用Constructor Overloading將資料一幀傳輸到另一幀。下面是從FirstForm到傳輸資料的示例SecondForm
第一表格.java
public class FirstForm extends javax.swing.JFrame {
public FirstForm() {
initComponents();
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
lblName = new javax.swing.JLabel();
txtName = new javax.swing.JTextField();
btnSubmit = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
lblName.setText("First Name:");
btnSubmit.setText("Submit");
btnSubmit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnSubmitActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(103, 103, 103)
.addComponent(lblName)
.addGap(36, 36, 36)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(btnSubmit)
.addComponent(txtName, javax.swing.GroupLayout.PREFERRED_SIZE, 118, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(88, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(52, 52, 52)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(lblName)
.addComponent(txtName, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addComponent(btnSubmit)
.addContainerGap(187, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void btnSubmitActionPerformed(java.awt.event.ActionEvent evt) {
SecondForm sf = new SecondForm(lblName.getText(), txtName.getText());
sf.setVisible(true);
dispose();
}
public static void main(String args[]) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(FirstForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(FirstForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(FirstForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(FirstForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new FirstForm().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton btnSubmit;
private javax.swing.JLabel lblName;
private javax.swing.JTextField txtName;
// End of variables declaration
}
第二表格.java
public class SecondForm extends javax.swing.JFrame {
public SecondForm() {
initComponents();
}
public static String lblName,txtName;
public SecondForm(String lblName, String txtName)
{
this.lblName=lblName;
this.txtName=txtName;
initComponents();
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
LblName = new javax.swing.JLabel();
TxtName = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowOpened(java.awt.event.WindowEvent evt) {
formWindowOpened(evt);
}
});
LblName.setText("jLabel1");
TxtName.setText("jLabel2");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(124, 124, 124)
.addComponent(LblName)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(TxtName)
.addContainerGap(198, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(120, 120, 120)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(LblName)
.addComponent(TxtName))
.addContainerGap(166, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void formWindowOpened(java.awt.event.WindowEvent evt) {
LblName.setText(lblName);
TxtName.setText(txtName);
}
public static void main(String args[]) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(SecondForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(SecondForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(SecondForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(SecondForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new SecondForm().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel LblName;
private javax.swing.JLabel TxtName;
// End of variables declaration
}
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