Code để tạo Open Dialog Box bởi sử dụng Java Swing

import java.awt.*; import javax.swing.*; import java.awt.event.*; import java.io.*; public class OpenMenu extends JFrame implements ActionListener{ JMenuBar mb; JMenu file; JMenuItem open; JTextArea ta; OpenMenu(){ open=new JMenuItem("Open File"); open.addActionListener(this); file=new JMenu("File"); file.add(open); mb=new JMenuBar(); mb.setBounds(0,0,800,20); mb.add(file); ta=new JTextArea(800,800); ta.setBounds(0,20,800,800); add(mb); add(ta); } public void actionPerformed(ActionEvent e) { if(e.getSource()==open){ openFile(); } } void openFile(){ JFileChooser fc=new JFileChooser(); int i=fc.showOpenDialog(this); if(i==JFileChooser.APPROVE_OPTION){ File f=fc.getSelectedFile(); String filepath=f.getPath(); displayContent(filepath); } } void displayContent(String fpath){ try{ BufferedReader br=new BufferedReader(new FileReader(fpath)); String s1="",s2=""; while((s1=br.readLine())!=null){ s2+=s1+"\n"; } ta.setText(s2); br.close(); }catch (Exception e) {e.printStackTrace(); } } public static void main(String[] args) { OpenMenu om=new OpenMenu(); om.setSize(800,800); om.setLayout(null); om.setVisible(true); om.setDefaultCloseOperation(EXIT_ON_CLOSE)

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import java.io.*;

public class OpenMenu extends JFrame implements ActionListener{

JMenuBar mb;

JMenu file;

JMenuItem open;

JTextArea ta;

OpenMenu(){

open=new JMenuItem("Open File");

open.addActionListener(this);

file=new JMenu("File");

file.add(open);

mb=new JMenuBar();

mb.setBounds(0,0,800,20);

mb.add(file);

ta=new JTextArea(800,800);

ta.setBounds(0,20,800,800);

add(mb);

add(ta);

}

public void actionPerformed(ActionEvent e) {

if(e.getSource()==open){

openFile();

}

}

void openFile(){

JFileChooser fc=new JFileChooser();

int i=fc.showOpenDialog(this);

if(i==JFileChooser.APPROVE_OPTION){

File f=fc.getSelectedFile();

String filepath=f.getPath();

displayContent(filepath);

}

}

void displayContent(String fpath){

try{

BufferedReader br=new BufferedReader(new FileReader(fpath));

String s1="",s2="";

while((s1=br.readLine())!=null){

s2+=s1+"\n";

}

ta.setText(s2);

br.close();

}catch (Exception e) {e.printStackTrace(); }

}

public static void main(String[] args) {

    OpenMenu om=new OpenMenu();

    om.setSize(800,800);

    om.setLayout(null);

    om.setVisible(true);

    om.setDefaultCloseOperation(EXIT_ON_CLOSE);

}

}