java中JFrame类中 公共方法调用
在NetBeans IDE 7.1.1中创建一个JFrame窗口程序。其中包含jTextField控件。现在需要在其他类中获取jTextField控件中的数据。
我是通过在JFrame中添加一个public方法，获取jTextField中的值。再到其他类中引用JFrame中的公共方法。结果在其他类中能获取jTextField中的初始值。更改后就不能即时的获取到了。
经测试：
JFrame中的public方法可以实时的获取jTextField中的值，但是经其他类一转，就变味了，这是咋解决啊、
代码如下:
public class NewJFrame extends javax.swing.JFrame { /** * Creates new form NewJFrame */ public String getback()//这个就是公共方法 { String c; c = jTextField1.getText(); // System.out.println(c); return c; } public NewJFrame() { 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(); jButton1 = new javax.swing.JButton(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jTextField1.setText("erg"); jTextField1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jTextField1ActionPerformed(evt); } }); jButton1.setText("jButton1"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton1ActionPerformed(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() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(156, 156, 156) .addComponent(jButton1)) .addGroup(layout.createSequentialGroup() .addGap(108, 108, 108) .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 160, javax.swing.GroupLayout.PREFERRED_SIZE))) .addContainerGap(132, Short.MAX_VALUE)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(48, 48, 48) .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(63, 63, 63) .addComponent(jButton1) .addContainerGap(145, Short.MAX_VALUE)) ); pack(); }// </editor-fold> private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: } private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { NewClass s = new NewClass();//newclass是新建其他的类，ee是其中的一个方法，只是打印。 s.ee(); // String m = getback(); // System.out.println(m); // TODO add your handling code here: } /** * @param args the command line arguments */ public static void main(String args[]) { /* * Set the Nimbus look and feel */ //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> /* * If Nimbus (introduced in Java SE 6) is not available, stay with the * default look and feel. For details see * http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ 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(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } //</editor-fold> /* * Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new NewJFrame().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JButton jButton1; private javax.swing.JTextField jTextField1; // End of variables declaration}
/*****************************其他类****************************/public class NewClass { public void ee(){ NewJFrame j = new NewJFrame(); String k = j.getback(); System.out.println(k); // b = j.getback(); } }