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Question

学习中，从书上抄下来的一段代码，编译运行时报错，麻烦帮忙看一下错在什么地方了？报错如下：
--------------------Configuration: <Default>--------------------
E:\JAVA_Workspace\ImageViwer.java:40: 非法的类型开始
            if (result == JFileChooser.APPROVE_OPTION)
            ^
E:\JAVA_Workspace\ImageViwer.java:40: 需要 <标识符>
            if (result == JFileChooser.APPROVE_OPTION)
                      ^
E:\JAVA_Workspace\ImageViwer.java:40: 需要 <标识符>
            if (result == JFileChooser.APPROVE_OPTION)
                                                     ^
3 错误Process completed.
代码如下：
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;public class ImageViwer
{
public static void main(String[] args)
{
JFrame frame = new ImageViwerFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(ture);
}
}class ImageViwerFrame extends JFrame
{
public ImageViwerFrame()
{
setTitle("ImageViwer");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

label = new JLabel();
add(label);

chooser = new JFileChooser();
chooser.setCurrentDirectory(new File('.'));

JMenuBar menuBar = new JMenuBar();
setJMenuBar(menuBar);

JMenu menu = new JMenu("File");
menuBar.add(menu);

JMenuItem openItem = new JmenuItem("open");
menu.add(openItem);
openItem.addActionListener(new ActionListener()
{
int result = chooser.showOpenDialog(null);
if (result == JFileChooser.APPROVE_OPTION)
{
String name = chooser.getSelectedFile().getPath();
label.setIcon(new ImageIcon(name));

}
});

JMenuItem exitItem = new JMenuItem("EXIT");
menu.add(exitItem);
exitItem.addActionListener(new AcitonListener()
{
public void actionPerformed(ActionEvent event)
{
System.exit(0);
}
});
}
private JLabel label;
private  JFileChooser chooser;
private static final int DEFAULT_WIDTH = 300;
private static final int DEFAULD_HEIGH = 400;
}

Answer 1

1.frame.setVisible(ture);    true写错了， 编译不过
2.DEFAULT_HEIGHT 这个成员变量定义成DEFAULD_HEIGH了，编译不过

Answer 2

package csdn;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class ImageViwerFrame extends JFrame{

 private JLabel label;
    private  JFileChooser chooser;
    private static final int DEFAULT_WIDTH = 300;
    private static final int DEFAULT_HEIGHT = 400;
 public ImageViwerFrame()
    {
        setTitle("ImageViwer");
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
        
        label = new JLabel();
        add(label);
        
        chooser = new JFileChooser();
        chooser.setCurrentDirectory(new File("."));
        
        JMenuBar menuBar = new JMenuBar();
        setJMenuBar(menuBar);
        
        JMenu menu = new JMenu("File");
        menuBar.add(menu);
        
        JMenuItem openItem = new JMenuItem("open");
        menu.add(openItem);
        class MyActionListener implements ActionListener{
            
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
int result = chooser.showOpenDialog(null);
            if (result == JFileChooser.APPROVE_OPTION)
            {
                String name = chooser.getSelectedFile().getPath();
                label.setIcon(new ImageIcon(name));
                
            }
}
        };
        openItem.addActionListener(new MyActionListener());
        
        JMenuItem exitItem = new JMenuItem("EXIT");
        menu.add(exitItem);
        
        class MyActionListener2 implements ActionListener{
            
public void actionPerformed(ActionEvent e) {
 System.exit(0);
}
        };
        
        exitItem.addActionListener(new MyActionListener2());
    }
        
    public static void main(String[] args)
        {
        JFrame frame = new ImageViwerFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        }}

Answer 3

package csdn;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class ImageViwerFrame extends JFrame{

 private JLabel label;
    private  JFileChooser chooser;
    private static final int DEFAULT_WIDTH = 300;
    private static final int DEFAULT_HEIGHT = 400;
 public ImageViwerFrame()
    {
        setTitle("ImageViwer");
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
        
        label = new JLabel();
        add(label);
        
        chooser = new JFileChooser();
        chooser.setCurrentDirectory(new File("."));
        
        JMenuBar menuBar = new JMenuBar();
        setJMenuBar(menuBar);
        
        JMenu menu = new JMenu("File");
        menuBar.add(menu);
        
        JMenuItem openItem = new JMenuItem("open");
        menu.add(openItem);
        
        openItem.addActionListener(new ActionListener()
           {
                public void actionPerformed(ActionEvent e)
                {
                 int result = chooser.showOpenDialog(null);
            if (result == JFileChooser.APPROVE_OPTION)
            {
                String name = chooser.getSelectedFile().getPath();
                label.setIcon(new ImageIcon(name));
                
            }
                }
           }
        );
        
        JMenuItem exitItem = new JMenuItem("EXIT");
        menu.add(exitItem);
    exitItem.addActionListener(new ActionListener()
           {
                public void actionPerformed(ActionEvent e)
                {
                 System.exit(0);
                }
           }
        );
    }
        
    public static void main(String[] args)
        {
        JFrame frame = new ImageViwerFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        }}
匿名内部类写法

Answer 4

import java.awt.event.*;
import java.io.*;
import javax.swing.*;public class ImageViwer
{
    public static void main(String[] args)
        {
        JFrame frame = new ImageViwerFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
        }
}class ImageViwerFrame extends JFrame
{
    public ImageViwerFrame()
    {
        setTitle("ImageViwer");
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGH);
        
        label = new JLabel();
        add(label);
        
        chooser = new JFileChooser();
        chooser.setCurrentDirectory(new File("."));
        
        JMenuBar menuBar = new JMenuBar();
        setJMenuBar(menuBar);
        
        
        JMenu menu = new JMenu("File");
        menuBar.add(menu);
        
        JMenuItem openItem = new JMenuItem("open");
        menu.add(openItem);
        openItem.addActionListener(new ActionListener()
        {
         public void actionPerformed(ActionEvent e){
         int result = chooser.showOpenDialog(null);
                if (result == JFileChooser.APPROVE_OPTION)
                {
                    String name = chooser.getSelectedFile().getPath();
                    label.setIcon(new ImageIcon(name));
                    
                }
         }
        });
        
        JMenuItem exitItem = new JMenuItem("EXIT");
        menu.add(exitItem);
        exitItem.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent event)
            {
                System.exit(0);
            }
        });
    }
    private JLabel label;
    private  JFileChooser chooser;
    private static final int DEFAULT_WIDTH = 300;
    private static final int DEFAULT_HEIGH = 400;
}                        兄弟，别急，从基础开始，你那段代码上的错误都是些低级错误，再接再厉吧