[英]How do I pass values between cards in Java CardLayout…this time i have given a good example
這是一個簡單的代碼來澄清我的問題:
這是我宣布兩個面板的主要類。 / * *要更改此許可證標題,請在“項目屬性”中選擇“許可證標題”。 *要更改此模板文件,請選擇“工具”| 模板*並在編輯器中打開模板。 * /
/ ** * * @author sakib * / public class MainPane {
private JPanel contentPane;
private Firstcard1 p1;
private SecondCard1 p2;
public void displayGUI()
{
JFrame frame = new JFrame("Card Layout Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel contentPane = new JPanel();
//a=S1;
contentPane.setLayout(new CardLayout());
p1 = new Firstcard1(contentPane);
p2 = new SecondCard1(contentPane);
contentPane.add(p1, "Panel 1");
contentPane.add(p2, "Panel 2");
frame.setContentPane(contentPane);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
new MainPane().displayGUI();
}
}
);
}
}
這是第一張牌:
public class Firstcard1擴展javax.swing.JPanel {
private JPanel contentpane;
/**
* Creates new form Firstcard1
*/
public Firstcard1(JPanel cp) {
this.contentpane=cp;
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jTextField1 = new javax.swing.JTextField();
Login = new javax.swing.JButton();
Login.setText("Login");
Login.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
LoginActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(117, 117, 117)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 138, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(158, 158, 158)
.addComponent(Login)))
.addContainerGap(145, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(105, 105, 105)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(Login)
.addContainerGap(134, Short.MAX_VALUE))
);
}// </editor-fold>
private void LoginActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
CardLayout layout = (CardLayout)contentpane.getLayout();
layout.show(contentpane, "Panel 2");
}
// Variables declaration - do not modify
private javax.swing.JButton Login;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}
這是第二張牌:
公共類SecondCard1擴展javax.swing.JPanel {
private JPanel contentpane;
/**
* Creates new form SecondCard1
*/
public SecondCard1(JPanel cp) {
this.contentpane=cp;
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jTextField1 = new javax.swing.JTextField();
back = new javax.swing.JButton();
back.setText("Back");
back.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
backActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(127, 127, 127)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 136, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(157, 157, 157)
.addComponent(back)))
.addContainerGap(137, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(121, 121, 121)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 36, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(back)
.addContainerGap(102, Short.MAX_VALUE))
);
}// </editor-fold>
private void backActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
CardLayout layout = (CardLayout)contentpane.getLayout();
layout.show(contentpane, "Panel 1");
}
// Variables declaration - do not modify
private javax.swing.JButton back;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}
我的問題是。如果我在第一張卡片的textarea中輸入一個值並按下登錄按鈕。該值將出現在第二張卡片的文本區域。我可以這樣做嗎?
你不得不將第二個面板的引用傳遞給第一個面板:
主要課程:
public class MainPane
{
public void displayGUI()
{
....
p1 = new Firstcard1(contentPane);
p2 = new SecondCard1(contentPane);
p1.setSecondCard(p2);
....
}
}
第一張牌:
public class Firstcard1 extends javax.swing.JPanel {
....
private SecondCard secondCard;
void setSecondCard(SecondCard secondCard)
{
this.secondCard = secondCard;
}
....
private void LoginActionPerformed(java.awt.event.ActionEvent evt)
{
CardLayout layout = (CardLayout)contentpane.getLayout();
layout.show(contentpane, "Panel 2");
secondCard.getTextField().setText(jTextField1.getText());
}
}
第二張牌:
public class SecondCard1 extends javax.swing.JPanel
{
...
JTextField getTextField()
{
return jTextField1;
}
...
}
但是當你繼續這樣的時候,程序很快就會變成一團糟。 我建議手動創建這些組件,而不使用任何可視化GUI構建器。
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