Javaはシンボルを見つけることができません、Javaは配列内のシンボルを見つけることができませんか？

Question

これは私がこのコード行を書くときに受けるエラーです。

symbol : variable isSeletecd 
location: class java.lang.String 
if (dorm[0].isSeletecd && meal[0].isSeletecd()) 
     ^

if (dorm[0].isSeletecd && meal[0].isSeletecd()) 
totalCharges.setText("2150.00"); 

プログラム：

import java.awt.BorderLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.JButton; 
import javax.swing.JComboBox; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JTextField; 

/** 

The Main class creates the GUI for the Dorm and 
Meal charges. 
*/ 

public class Main extends JFrame 
{ 
private JPanel dormPanel; 
private JComboBox dormBox; 
private JPanel mealPanel; 
private JComboBox mealBox; 
private JPanel totalChargesPanel; 
private JPanel selectedMealPanel; 
private JPanel buttonPanel; 
private JButton calcButton; 
private JLabel label1; 
private JTextField totalCharges; 

private String[] dorm = { "Allen Hall: $1,500 per semester", 
"Pike Hall: $1,600 per semester", 
"Farthing Hall: $1,200 per semester", 
"University Suites: $1,800 pe r semester"}; 

private String[] meal = { "7 meals per week: $650 per semester", 
"14 meals per week: $1,095 per semester", 
"Unlimited meals: $1,500 per semester"}; 

/** 
Constructor 
*/ 
public Main() 
{ 
super("Dormitory and Meal Plan"); 

// Specify an action for the close button. 
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

// Create a BorderLayout manager. 
setLayout(new BorderLayout()); 

// Create the dorm and meal panel. 
buildDormPanel(); 
buildMealPanel(); 
buildSelectedTotalChargesPanel(); 
buildButtonPanel(); 

// Add the components to the content pane. 
add(dormPanel, BorderLayout.WEST); 
add(mealPanel, BorderLayout.EAST); 
add(totalChargesPanel, BorderLayout.SOUTH); 
add(buttonPanel, BorderLayout.NORTH); 

// Pack the contents of the window and display it. 
pack(); 
setVisible(true); 
} 

// The buildDormPanel method builds the dorm panel. 
private void buildDormPanel() 
{ 
// Create the dorm panel. 
dormPanel = new JPanel(); 
dormBox = new JComboBox(dorm); 

// Register the action listener. 
dormBox.addActionListener(new ComboBoxListener()); 

// Add the dorm panel to the panel. 
dormPanel.add(dormBox); 
} 

// The buildMealPanel method builds the meal panel. 
private void buildMealPanel() 
{ 
// Create the meal panel. 
mealPanel = new JPanel(); 
mealBox = new JComboBox(meal); 

// Register the action listener. 
mealBox.addActionListener(new ComboBoxListener()); 

// Add the meal panel to the panel. 
mealPanel.add(mealBox); 
} 

// The buttonPanel method builds the bottun panel. 
private void buildButtonPanel() 
{ 
// Create a panel. 
buttonPanel = new JPanel(); 

// Create a button. 
calcButton = new JButton("Calculate"); 

// Register an action listener with the button. 
calcButton.addActionListener(new ButtonListener()); 

// Add the button to the panel. 
buttonPanel.add(calcButton); 
} 

// The buildSelectedDormPanel builds the selected totalCharges panel. 
private void buildSelectedTotalChargesPanel() 
{ 
// Create the totalChargesPanel for the label. 
totalChargesPanel = new JPanel(); 
label1 = new JLabel("Total charges per semester: "); 

// Create the totalCharges textfield. 
totalCharges = new JTextField (25); 
totalCharges.setEditable(false); 

// Add the totalChargesPanel to the panel. 
totalChargesPanel.add(label1); 
totalChargesPanel.add(totalCharges); 
} 

/** Private inner class that handles the event when the user 
selects the dorm and meal boxes. 
*/ 
private class ComboBoxListener implements ActionListener 
{ 
public void actionPerformed(ActionEvent e) 
{ 
// Variables to hold the dorm, meal, and total charges. 
String dorm = (String) dormBox.getSelectedItem(); 
String meal = (String) mealBox.getSelectedItem(); 

// Calculates the total. 
totalCharges.setText(meal + dorm); 
} 
} 

private class ButtonListener implements ActionListener 
{ 
public void actionPerformed(ActionEvent e) 
{ 
if (dorm[0].isSeletecd && meal[0].isSeletecd()) 
totalCharges.setText("2150.00"); 
} 
} 

public static void main(String[] args) 
{ 
new Main(); 
} 
} 

Answer 1

dormとmealは、文字列配列では、java.lang.StringにはisSeletecdフィールドまたは​​方法は存在しません。

Answer 2

dormとmealはStringクラスには​​方法はありませんが、JComboBox成分で現在選択されている項目のインデックス何を入手するために使用することができるJComboBoxためgetSelectedIndex()方法がある文字列

あります。あなたの問題を解決します

if(dormBox.getSelectedIndex()==0 && mealBox.getSelectedIndex()==0) 

に

if (dorm[0].isSeletecd && meal[0].isSeletecd()) 

からあなたButtonListenerクラス

にif文で条件を置換することにより

。

だからあなたButtonListenerクラスは今より多くの情報のためReffer getSelectedIndex()

private class ButtonListener implements ActionListener { 
    public void actionPerformed(ActionEvent e) { 
     if(dormBox.getSelectedIndex()==0 && mealBox.getSelectedIndex()==0) 
      totalCharges.setText("2150.00"); 
    } 
} 

---

になります。