JFileChooser.showOpenDialog不能打开,并且没有错误被抛出? [英] JFileChooser.showOpenDialog not opening, and no error being thrown?
本文介绍了JFileChooser.showOpenDialog不能打开,并且没有错误被抛出?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
好吧,我正在尝试编写一个十六进制编辑器,并且正在尝试创建一个负载JMenuItem,但它不起作用。 JFileChooser OpenDialog不显示,并且没有显示错误。
import java.awt。*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing。*;
import java.util.Vector;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
公共类HexEditor扩展JFrame {
JTextArea textArea;
JFileChooser chooser; // = new JFileChooser();
FileInputStream fin;
JMenuBar menuBar;
JMenu文件;
JMenuItem加载;
public HexEditor(){
super(Cypri的java十六进制编辑器);
chooser = new JFileChooser();
load = new JMenuItem(Load);
load.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
try {
openFile() ;
fin = new FileInputStream(chooser.getSelectedFile());
int ch;
StringBuffer strContent = new StringBuffer();
for(int i = 0;(ch = fin.read())!= -1; i ++){
String s = Integer.toHexString(ch);
if(s。 ()< 2)
s =0+ Integer.toHexString(ch);
if(i <10)
strContent.append(+ s .toUpperCase());
else {
strContent.append(+ s.toUpperCase()+\\\
);
i = 0;
}
}
textArea.setText(strContent.toString());
//textArea.setWrapStyleWord(true);
//textArea.setColumns(50);
//textArea.setRows(50);
}
catch(Exception e){
e.printStackTrace();
}
}
});
file = new JMenu(File);
file.add(new JMenuItem(Load));
menuBar = new JMenuBar();
menuBar.add(file);
textArea = new JTextArea();
textArea.setSize(300,300);
textArea.setText(Hello \\\
);
textArea.append(world!);
setSize(640,480);
//getContentPane().setBackground(Color。);
getContentPane()。setLayout(new BorderLayout());
getContentPane()。add(BorderLayout.NORTH,menuBar);
getContentPane()。add(BorderLayout.WEST,textArea);
pack();
setVisible(true);
}
public void openFile(){
chooser.showOpenDialog(this);
public static void main(String [] args){
HexEditor app = new HexEditor();
$ div $解析方案
你不要添加JMenuItem和监听器,而是创建一个新的。
替换:
file.add(new JMenuItem(Load));
with
file.add(负载);
Okay, so I'm trying to make a hex editor, and I'm trying to make a load JMenuItem, but it's not working. The JFileChooser OpenDialog just doesn't show up, and no errors are being shown.
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import java.util.Vector;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
public class HexEditor extends JFrame{
JTextArea textArea;
JFileChooser chooser;// = new JFileChooser();
FileInputStream fin;
JMenuBar menuBar;
JMenu file;
JMenuItem load;
public HexEditor(){
super("Cypri's java hex editor");
chooser = new JFileChooser();
load = new JMenuItem("Load");
load.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event) {
try{
openFile();
fin = new FileInputStream(chooser.getSelectedFile());
int ch;
StringBuffer strContent = new StringBuffer("");
for(int i = 0; (ch = fin.read()) != -1; i++){
String s = Integer.toHexString(ch);
if(s.length() < 2)
s = "0" + Integer.toHexString(ch);
if(i < 10)
strContent.append(" " + s.toUpperCase());
else{
strContent.append(" " + s.toUpperCase() + "\n");
i = 0;
}
}
textArea.setText(strContent.toString());
//textArea.setWrapStyleWord(true);
//textArea.setColumns(50);
//textArea.setRows(50);
}
catch(Exception e){
e.printStackTrace();
}
}
});
file = new JMenu("File");
file.add(new JMenuItem("Load"));
menuBar = new JMenuBar();
menuBar.add(file);
textArea = new JTextArea();
textArea.setSize(300,300);
textArea.setText("Hello\n");
textArea.append(" world!");
setSize(640, 480);
//getContentPane().setBackground(Color.);
getContentPane().setLayout(new BorderLayout());
getContentPane().add(BorderLayout.NORTH, menuBar);
getContentPane().add(BorderLayout.WEST, textArea);
pack();
setVisible(true);
}
public void openFile(){
chooser.showOpenDialog(this);
}
public static void main(String[] args){
HexEditor app = new HexEditor();
}
}
解决方案
You never add the JMenuItem with the listener, instead you create a new one.
Replace:
file.add(new JMenuItem("Load"));
with
file.add(load);
这篇关于JFileChooser.showOpenDialog不能打开,并且没有错误被抛出?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文