setText (String t) von JTextField kann nicht den Inhalt des Textfeldes ändern

Question

The Picture show the problem setting dialog. The dialog's first JTextfield works fine with setText(String t) method when change the first JComboBox selected Item, but the second JTextfield's setText(String t) method doesn't change the content of itself's when change the second JComboBox seleted item.

Die Code der Quelle unten angebracht ist. Die beiden JTextField sind in der gleichen Weise konstruiert. Aber ich weiß nicht, warum die Methode setText (String) des zweiten nicht funktioniert.

package ztio.gui.updateGUI; 

import java.awt.Container; 
import java.awt.GridBagConstraints; 
import java.awt.GridBagLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.io.IOException; 
import java.util.ArrayList; 
import java.util.Arrays; 
import java.util.List; 
import java.util.Map; 
import java.util.Set; 

import javax.swing.BorderFactory; 
import javax.swing.Box; 
import javax.swing.BoxLayout; 
import javax.swing.JButton; 
import javax.swing.JComboBox; 
import javax.swing.JDialog; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JTextField; 
import javax.swing.UIManager; 
import javax.swing.UnsupportedLookAndFeelException; 
import javax.swing.border.TitledBorder; 



public class SimpleSettingDialog extends JDialog { 
    private final int MAX_THRES_NUM = 10; 
    private final int MAX_VALUE_THRES_NUM = 10; 
    private JPanel dialogPane; 
    private JComboBox testCaseCombo; 
    private JComboBox testCaseItemCombo; 
    private JComboBox[] judgeOperationComboArray = new JComboBox[MAX_THRES_NUM]; 
    private JComboBox[] thresTypeComboArray = new JComboBox[MAX_THRES_NUM]; 
    private String[] judgeOperationStrings; 
    private String[] thresTypeStrings; 
    private List<JButton> testBtnList; 
    private JTextField showTargetChoice; 
    private JTextField showTestCase; 


    public SimpleSettingDialog(JFrame parent, boolean isModal) { 
     // TODO Auto-generated constructor stub 
     super(parent, isModal); 
     String[] judges = {">", "<", "="}; 
     String[] types = {"int", "float", "string"}; 
     judgeOperationStrings = judges; 
     thresTypeStrings = types; 


     dialogPane = (JPanel) getContentPane(); 
     dialogPane.setLayout(new GridBagLayout()); 
     TitledBorder titled = BorderFactory.createTitledBorder("Config Thresholds"); 
     dialogPane.setBorder(titled); 

     JPanel testCasePanel = createTestCasePanel(); 
     GridBagConstraints c = new GridBagConstraints(); 
     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 1.0; 
     c.weighty = 0.0; 
     c.gridwidth = 1; 
     c.gridx = 0; 
     c.gridy = 0; 
     dialogPane.add(testCasePanel, c); 
     c.fill = GridBagConstraints.BOTH; 
     c.ipady = 0; 
     c.weightx = 1.0; 
     c.weighty = 1.0; 
     c.gridwidth = 1; 
     c.gridx = 0; 
     c.gridy = 1; 

     JPanel testItemPanel = createTestCaseItemPanel(); 

     JPanel debug = new JPanel(); 
     dialogPane.add(debug, c); 
    } 

    private JPanel createThresListPanel() { 
     JPanel thresListPanel = new JPanel(); 
     thresListPanel.setLayout(new BoxLayout(thresListPanel, BoxLayout.Y_AXIS)); 
     for(int i = 0; i < 2; ++i){ 
      JPanel thresPanel = createThresPanel(i); 
      thresListPanel.add(thresPanel); 
     } 
     return thresListPanel; 
    } 

    private JPanel createThresPanel(int i) { 
     // TODO Auto-generated method stub 
     JPanel thresPanel = new JPanel(new GridBagLayout()); 
     TitledBorder titled = BorderFactory.createTitledBorder("The " + (((i+1)==1)?"1st":((i+1)==2?"2nd":((i+1==3?"3rd":((i+1)+"th"))))) + " Threshold"); 
     thresPanel.setBorder(titled); 
     JComboBox thresTypeCombo = new JComboBox(thresTypeStrings); 
     thresTypeComboArray[i] = thresTypeCombo; 
     thresTypeCombo.setSelectedItem("string"); 
     JComboBox judgeOperationCombo = new JComboBox(judgeOperationStrings); 
     judgeOperationComboArray[i] = judgeOperationCombo; 
     judgeOperationCombo.setSelectedItem("="); 
     JLabel label1 = new JLabel("Threshold's type:"); 
     JLabel label2 = new JLabel("Judge Operation:"); 

     GridBagConstraints c = new GridBagConstraints(); 
     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 0.0; 
     c.gridwidth = 1; 
     c.gridx = 0; 
     c.gridy = 0; 
     thresPanel.add(label1, c); 

     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 1.0; 
     c.gridwidth = 1; 
     c.gridx = 1; 
     c.gridy = 0; 
     thresPanel.add(thresTypeCombo, c); 

     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 0.0; 
     c.gridwidth = 1; 
     c.gridx = 0; 
     c.gridy = 1; 
     thresPanel.add(label2, c); 

     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 1.0; 
     c.gridwidth = 1; 
     c.gridx = 1; 
     c.gridy = 1; 
     thresPanel.add(judgeOperationCombo, c); 

     return thresPanel; 
    } 

    private JPanel createTestCaseItemPanel() { 
     // TODO Auto-generated method stub 
     String[] testItemNameArray = {"volume", "brightness"}; 
     testCaseItemCombo = new JComboBox(testItemNameArray); 

     testCaseItemCombo.addActionListener(new ActionListener() { 

      public void actionPerformed(ActionEvent e) { 
       // TODO Auto-generated method stub 
       JComboBox cb = (JComboBox)e.getSource(); 
       String caseItemName = (String)cb.getSelectedItem(); 
       String caseName = (String)testCaseCombo.getSelectedItem(); 
       String targetString = caseName + "->" + caseItemName; 
       System.out.println(targetString); 
       System.out.println("target text field: " + showTargetChoice.getText()); 
       showTargetChoice.setText(targetString); 
      } 
     }); 

     TitledBorder titled; 

     titled = BorderFactory.createTitledBorder("Test Case Item"); 
     JPanel comp = new JPanel(new GridBagLayout()); 
     comp.setBorder(titled); 

     JButton btnAddTestCaseItem = new JButton("ADD"); 
     btnAddTestCaseItem.addActionListener(new ActionListener() { 

      public void actionPerformed(ActionEvent e) { 
       // TODO Auto-generated method stub 

      } 
     }); 

     JButton btnDelTestCaseItem = new JButton("DEL"); 
     btnDelTestCaseItem.addActionListener(new ActionListener() { 

      public void actionPerformed(ActionEvent e) { 
       // TODO Auto-generated method stub 

      } 
     }); 



     GridBagConstraints c = new GridBagConstraints(); 
     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 0.0; 
     c.gridwidth = 1; 
     c.gridx = 0; 
     c.gridy = 0; 
     comp.add(testCaseItemCombo, c); 

     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 0.0; 
     c.gridwidth = 1; 
     c.gridx = 1; 
     c.gridy = 0; 
     comp.add(btnAddTestCaseItem, c); 

     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 0.0; 
     c.gridwidth = 1; 
     c.gridx = 2; 
     c.gridy = 0; 
     comp.add(btnDelTestCaseItem, c); 

     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 1.0; 
     c.gridwidth = 1; 
     c.gridx = 3; 
     c.gridy = 0; 
     comp.add(new JPanel(), c); 

     //Row 2 
     JLabel labelRegexp = new JLabel("target string:"); 
     showTargetChoice = new JTextField(); 
     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 0.0; 
     c.gridwidth = 1; 
     c.gridx = 0; 
     c.gridy = 1; 
     comp.add(labelRegexp, c); 

     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 0.0; 
     c.gridwidth = 3; 
     c.gridx = 1; 
     c.gridy = 1; 
     comp.add(showTargetChoice, c); 

     JPanel thresListPanel = createThresListPanel(); 
     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 0.0; 
     c.gridwidth = 4; 
     c.gridx = 0; 
     c.gridy = 2; 
     comp.add(thresListPanel, c); 

     return comp; 
    } 

    private JPanel createTestCasePanel() { 
     // TODO Auto-generated method stub 
     String[] testCaseArray = {"Light", "Voice"}; 
     testCaseCombo = new JComboBox(testCaseArray); 
     testCaseCombo.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent e) { 
       // TODO Auto-generated method stub 
       JComboBox cb = (JComboBox)e.getSource(); 
       String caseName = (String)cb.getSelectedItem(); 
       System.out.println(caseName); 
       showTestCase.setText(caseName); 
      } 
     }); 
     TitledBorder titled; 

     titled = BorderFactory.createTitledBorder("Test Case"); 
     JPanel comp = new JPanel(new GridBagLayout()); 
     comp.setBorder(titled); 

     JButton btnAddTestCase = new JButton("ADD"); 
     btnAddTestCase.addActionListener(new ActionListener() { 

      public void actionPerformed(ActionEvent e) { 
       // TODO Auto-generated method stub 
      } 
     }); 

     JButton btnDelTestCase = new JButton("DEL"); 
     btnDelTestCase.addActionListener(new ActionListener() { 

      public void actionPerformed(ActionEvent e) { 
       // TODO Auto-generated method stub 

      } 
     }); 

     GridBagConstraints c = new GridBagConstraints(); 
     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 0.0; 
     c.gridwidth = 1; 
     c.gridx = 0; 
     c.gridy = 0; 
     comp.add(testCaseCombo, c); 

     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 0.0; 
     c.gridwidth = 1; 
     c.gridx = 1; 
     c.gridy = 0; 
     comp.add(btnAddTestCase, c); 

     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 0.0; 
     c.gridwidth = 1; 
     c.gridx = 2; 
     c.gridy = 0; 
     comp.add(btnDelTestCase, c); 

     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 1.0; 
     c.gridwidth = 1; 
     c.gridx = 3; 
     c.gridy = 0; 
     comp.add(new JPanel(), c); 

     JLabel label = new JLabel("selected test case:"); 
     showTestCase = new JTextField(); 
     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 0.0; 
     c.gridwidth = 1; 
     c.gridx = 0; 
     c.gridy = 1; 
     comp.add(label, c); 

     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 1.0; 
     c.gridwidth = 3; 
     c.gridx = 1; 
     c.gridy = 1; 
     comp.add(showTestCase, c); 

     JPanel testCaseItemPanel = createTestCaseItemPanel(); 
     c.fill = GridBagConstraints.HORIZONTAL; 
     c.ipady = 0; 
     c.weightx = 0.0; 
     c.gridwidth = 4; 
     c.gridx = 0; 
     c.gridy = 2; 
     comp.add(testCaseItemPanel, c); 



     return comp; 
    } 

    private static void createAndShowGUI() { 
     JFrame frame = new JFrame("SimpleSettingDemo"); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     JButton btn = new JButton("open setting dialog"); 
     btn.addActionListener(new ActionListener() { 

      @Override 
      public void actionPerformed(ActionEvent e) { 
       // TODO Auto-generated method stub 
       SimpleSettingDialog simpleSettingDialog = new SimpleSettingDialog(frame, true); 
       simpleSettingDialog.pack(); 
       simpleSettingDialog.setVisible(true); 
      } 
     }); 
     frame.getContentPane().add(btn); 
     frame.pack(); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) { 
     try { 
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
     } catch (ClassNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (InstantiationException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (IllegalAccessException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (UnsupportedLookAndFeelException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

     javax.swing.SwingUtilities.invokeLater(new Runnable() { 
      public void run() { 
       createAndShowGUI(); 
      } 
     }); 

    } 
} 

Answer 1

createTestCaseItemPanel() wird zweimal ausgeführt. Sobald es von createTestCasePanel() ausgeführt wird. Das zweite Mal in dieser Zeile im Konstruktor:

JPanel testItemPanel = createTestCaseItemPanel(); 

Dieser zweite Aufruf erzeugt eine lokale Variable testItemPanel, die nicht verwendet wird. Dies überschreibt jedoch einige der Mitglieder, einer davon ist showTargetChoice, der jetzt auf ein Feld zeigt, das nicht sichtbar ist.

Um das Problem zu beheben, nur diesen zweiten Anruf loswerden.