1   
2   import java.awt.*;
3   import java.awt.event.*;
4   import javax.swing.*;
5   import java.io.*;
6   
7     void jButton1_actionPerformed(ActionEvent e) {
8       
9       boolean success = (new File("c:\\test1.txt")).exists();
10      
11        if (success == false) {
12          this.setTitle("File Do NOT Exists!");
13        }
14        else {
15           this.setTitle("File Exists!");
16        }
17    }