Question

I need help on Java Swing, how to create a Java Swing program that can able to Display all the name list from the text file then Display the Longest name...

Answer 1

CODE :

import java.awt.*;
import java.io.*;
import java.util.*;
import javax.swing.*;

public class SwingPrg {
public static void main(String[] args) {
  
   // Creating File Chooser Dialog Object
JFileChooser chooseFile = new JFileChooser();
  
   // Creating JFrame
   JFrame jframe = new JFrame();
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   //Set JFrame size
   jframe.setSize(400, 400);
   //Set JFrame layout
jframe.setLayout(new FlowLayout());
  
   // Label before TextArea of File Data
   JLabel lbl1 = new JLabel("FILE DATA : ");
  
   // TextArea to display file data
   JTextArea textarea = new JTextArea(20, 20);
   // LineWrap enabling for TextArea
   textarea.setLineWrap(true);
   // Set ReadOnly TextArea
   textarea.setEditable(false);
  
   // Label before TextArea of Longest Word
   JLabel lbl2 = new JLabel("Longest Word : ");
  
   // TextArea to display file longest word
   JTextArea textarea2 = new JTextArea(20, 10);
   // LineWrap enabling for TextArea
   textarea2.setLineWrap(true);
   // Set ReadOnly TextArea
   textarea2.setEditable(false);
  
   // Button for Browsing File
JButton btnFileBrowse = new JButton("OPEN FILE");
  
   // Button click action listener
   btnFileBrowse.addActionListener(ev -> {
       // Store file browse dialog return value
       int returnVal = chooseFile.showOpenDialog(jframe);
      
       // If file browsed from browse file dialog
       if (returnVal == JFileChooser.APPROVE_OPTION) {
          
           // File object to get selected file from browse dialog
           File file = chooseFile.getSelectedFile();
           try {
               // Reading data from file object and set data from file to textarea
               textarea.read(new InputStreamReader(new FileInputStream(file)), "Reading Data from File");
          
               // scanner object to read data from file
               Scanner scanner = new Scanner(file);

               // variable to store longest word
               String longWord = "";
                  
               // while file has lines  
               while (scanner.hasNextLine()) {
                  
                   // scanner object to read each word from line
                   Scanner wordScanner = new Scanner(scanner.nextLine());
                  
                   // loop while words present
                   while (wordScanner.hasNext()) {
                      
                       // store word to variable
                       String str = wordScanner.next();
                      
                       // compare with longWord value & store if word is longer than previous stored value
                       if(str.length() >= longWord.length())
                           longWord = str;
                   }
               }
              
               // Set longest word to textarea2
               textarea2.setText(longWord);
          
           } catch (Exception e) {
           e.printStackTrace();
           }
       }
});
  
   // Adding lable1 to jframe
   jframe.add(lbl1, BorderLayout.CENTER);
// Adding textarea for file data to jframe with scrollpane
   jframe.add(new JScrollPane(textarea), BorderLayout.CENTER);
   // Adding lable2 to jframe
   jframe.add(lbl2, BorderLayout.CENTER);
   // Adding textarea for file data to jframe with scrollpane
   jframe.add(new JScrollPane(textarea2), BorderLayout.CENTER);
// Adding file browse button to jframe
   jframe.add(btnFileBrowse, BorderLayout.PAGE_END);
jframe.pack();
   // Set jframe visible
jframe.setVisible(true);
}
}

OUTPUT: