求助 ！急，这句错在哪里？

Question

ActionListener comboBoxL = new ActionListener() {
public void actionPerformed(ActionEvent e) {
if("comboBoxChanged".equals(e.getActionCommand())) {
iconLabel.setIcon(icons[comboBox.getSelectedInde()]);
}
}
};
编译后，出现以下错误：
c:\java\work>javac LunarPhases.java
LunarPhases.java:52: 缺少返回语句
        }
        ^
1 错误
大侠帮我解决一下，谢谢了

Answer 1

对啊，代码贴少了。BTW，if("comboBoxChanged".equals(e.getActionCommand())) 这样写看了很不习惯啊if(e.getActionCommand().equals("comboBoxChanged"))这样如何？呵呵

Answer 2

我全贴出来啊，我手写的一个JFC程序，因为没有通过编译，可能还有别的错误，大侠们帮我找下啊
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class LunarPhases extends JFrame {
  JPanel mainPane,selectPane,displayPane;
  JComboBox comboBox;
  ImageIcon[] icons = {new ImageIcon("c:/image0.jpg"),
     new ImageIcon("c:/image1.jpg"),
     new ImageIcon("c:/image2.jpg"),
     new ImageIcon("c:/image3.jpg"),
     new ImageIcon("c:/image4.jpg"),
     new ImageIcon("c:/image5.jpg"),
     new ImageIcon("c:/image6.jpg"),
     new ImageIcon("c:/image7.jpg"),
     new ImageIcon("c:/image8.jpg")
    };
  JLabel iconLabel ;
  String[] items = {"0",
  "1",
  "2",
  "3",
  "4",
  "5",
  "6",
  "7",
  "8"
 };
  public LunarPhases() {
    super("Lunar Phases");
  }
  public Component creatComponent() {
    mainPane = new JPanel(new GridLayout(2,1));//create and set the mainpane
    mainPane.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
    mainPane.setSize(100,100);
    selectPane = new JPanel(new GridLayout(0,1));//create and set the selectpane
    selectPane.setBorder(BorderFactory.createTitledBorder(
BorderFactory.createEmptyBorder(5,5,5,5),
"Select Phase"));
    selectPane.setSize(100,50);
    comboBox = new JComboBox(items);//create and set the combobox and add it on  
    comboBox.addActionListener(comboBoxL);
    selectPane.add(comboBox);
    displayPane =new JPanel(new GridLayout(0,1));//create and set the displaypane
    displayPane.setBorder(BorderFactory.createTitledBorder(
BorderFactory.createEmptyBorder(5,5,5,5),
"Select Phase"));
    displayPane.setSize(100,100);
    iconLabel = new JLabel(icons[0]);//add the icon
    displayPane.add(iconLabel);
    mainPane.add(selectPane);
    mainPane.add(displayPane);
  }
  ActionListener comboBoxL = new ActionListener() {
    public void actionPerformed(ActionEvent e) {
      if("comboBoxChanged".equals(e.getActionCommand())) {
        iconLabel.setIcon(icons[comboBox.getSelectedIndex()]);
      }
    }
  };
  public void createAndShowGUI() {
    setDefaultLookAndFeelDecorated(true);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    pack();
    setVisible(true);
  }
  public static void main(String args[]) {
    new LunarPhases().createAndShowGUI();
  }
}

Answer 3

creatComponent没有返回值，当然有错，要么程序return一个component，要么改成void，看你的需要

Answer 4

我的createAndShowGUI()接口没写完

Answer 5

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class LunarPhases extends JFrame {
JPanel mainPane,selectPane,displayPane;
JComboBox comboBox;
ImageIcon[] icons = {new ImageIcon("c:/image0.jpg"),
new ImageIcon("c:/image1.jpg"),
new ImageIcon("c:/image2.jpg"),
new ImageIcon("c:/image3.jpg"),
new ImageIcon("c:/image4.jpg"),
new ImageIcon("c:/image5.jpg"),
new ImageIcon("c:/image6.jpg"),
new ImageIcon("c:/image7.jpg"),
new ImageIcon("c:/image8.jpg")
};
JLabel iconLabel ;
String[] items = {"0",
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8"
};
public LunarPhases() {
super("Lunar Phases");
}
public Component creatComponent() {
mainPane = new JPanel(new GridLayout(2,1));//create and set the mainpane
mainPane.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
mainPane.setSize(100,100);
selectPane = new JPanel(new GridLayout(0,1));//create and set the selectpane
selectPane.setBorder(BorderFactory.createTitledBorder(
BorderFactory.createEmptyBorder(5,5,5,5),
"Select Phase"));
selectPane.setSize(100,50);
comboBox = new JComboBox(items);//create and set the combobox and add it on  
comboBox.addActionListener(comboBoxL);
selectPane.add(comboBox);
displayPane =new JPanel(new GridLayout(0,1));//create and set the displaypane
displayPane.setBorder(BorderFactory.createTitledBorder(
BorderFactory.createEmptyBorder(5,5,5,5),
"Select Phase"));
displayPane.setSize(100,100);
iconLabel = new JLabel(icons[0]);//add the icon
displayPane.add(iconLabel);
mainPane.add(selectPane);
return mainPane.add(displayPane);
}
ActionListener comboBoxL = new ActionListener() {
public void actionPerformed(ActionEvent e) {
if("comboBoxChanged".equals(e.getActionCommand())) {
iconLabel.setIcon(icons[comboBox.getSelectedIndex()]);
}
}
};
public void createAndShowGUI() {
setDefaultLookAndFeelDecorated(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
pack();
setVisible(true);
}
public static void main(String args[]) {
new LunarPhases().createAndShowGUI();
}
}
这样就对了

Answer 6

createAndShowGUI()里还要添句
 getContentPane().add(createComponent()),才有显示