Code để tạo Open Dialog Box bởi sử dụng Java Swing

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1. 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)

   Trả lời

2. 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);

   }

   }

   Trả lời