Question

Swing File Adder:

Build a GUI that contains an input file, text box and Infile button. It also must contain and output file, text box and Outfile button. Must also have a process button must read the infile and write to the outfile that is already selected and clear button. It must pull up a JFile chooser that allows us to brows to the file and places the full path name same with the output file.  Program should not be able to blow up and make good use of exception handling. Handling and providing pop up messages for such conditiions as: input file not found, output file cannot be created, and bad data in the input file, should all be implemented.

Answer 1

Textbox for using Swing:

import javax.swing.*;  

import java.awt.event.*;  

public class TextFieldExample implements ActionListener{  

JTextField tf1,tf2;  

JButton b1;  

TextFieldExample(){  

        JFrame f= new JFrame();        

  tf1=new JTextField();     

     tf1.setBounds(50,50,150,20);        

  tf2=new JTextField();         

tf2.setBounds(50,100,150,20);

tf2.setEditable(false);         

  b1=new JButton("+");        

  b1.setBounds(50,200,50,50);        

  b2=new JButton("-");   

b2.setBounds(120,200,50,50);         

b1.addActionListener(this);   

b2.addActionListener(this);       

   f.add(tf1);

f.add(tf2);

f.add(b1);

f.setSize(300,300);     

     f.setLayout(null);        

  f.setVisible(true);    

  }           

  public void actionPerformed(ActionEvent e) {         

String s1=tf1.getText();        

   if(e.getSource()==b1){             

   tf2.setText(s1);     

   }

   }  

public static void main(String[] args) {    

  new TextFieldExample();

} }  

InputFile using JFIleChooser:

1. import javax.swing.*;    
2. import java.awt.event.*;    
3. import java.io.*;    
4. public class FileChooserExample extends JFrame implements ActionListener{    
5. JMenuBar mb;    
6. JMenu file;    
7. JMenuItem open;    
8. JTextArea ta;    
9. FileChooserExample(){    
10. open=new JMenuItem("Open File");    
11. open.addActionListener(this);            
12. file=new JMenu("File");    
13. file.add(open);             
14. mb=new JMenuBar();    
15. mb.setBounds(0,0,800,20);    
16. mb.add(file);              
17. ta=new JTextArea(800,800);    
18. ta.setBounds(0,20,800,800);              
19. add(mb);    
20. add(ta);              
21. }    
22. public void actionPerformed(ActionEvent e) {    
23. if(e.getSource()==open){    
24.     JFileChooser fc=new JFileChooser();    
25.     int i=fc.showOpenDialog(this);    
26.     if(i==JFileChooser.APPROVE_OPTION){    
27.         File f=fc.getSelectedFile();    
28.         String filepath=f.getPath();    
29.         try{  
30.         BufferedReader br=new BufferedReader(new FileReader(filepath));    
31.         String s1="",s2="";                         
32.         while((s1=br.readLine())!=null){    
33.         s2+=s1+"\n";    
34.         }    
35.         ta.setText(s2);    
36.         br.close();    
37.         }catch (Exception ex) {ex.printStackTrace();  }                 
38.     }    
39. }    
40. }          
41. public static void main(String[] args) {    
42.     FileChooserExample om=new FileChooserExample();    
43.              om.setSize(500,500);    
44.              om.setLayout(null);    
45.              om.setVisible(true);    
46.              om.setDefaultCloseOperation(EXIT_ON_CLOSE);    
47. }    
48. }