Database interaction

Question

is there any method in java so we can take input from text file and save output in text file ???????????
i m taking about standalone application

Answer 1

Continuing....
A reader using both FileReader and Scanner:
import java.util.Scanner;
import java.io.FileReader;
import java.io.IOException;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class UsingScannerPattern implements ActionListener{
     private static JFrame frame;
     private static JButton find, clear, exit;
     private static JTextField textBox;
     private static JTextArea searchResults;
     private static JPanel panel1, panel2, panel3;
     private static FileReader filereader;
     private static Scanner reader;
     public UsingScannerPattern(String windowTitle) {
          frame = new JFrame(windowTitle);
          find = new JButton("Find");
          clear = new JButton("Clear");
          exit = new JButton("Exit");
          textBox = new JTextField(20);
          searchResults = new JTextArea(20, 20);
          panel1 = new JPanel();
          panel2 = new JPanel();
          panel3 = new JPanel();
          find.addActionListener(this);
          clear.addActionListener(this);
          exit.addActionListener(this);
          Label label1 = new Label("String");
          panel1.add(label1);panel1.add(textBox);
          panel2.add(searchResults);
          panel3.add(find);panel3.add(clear);panel3.add(exit);
          frame.add(panel1, "North");
          frame.add(panel2);
          frame.add(panel3, "South");
          frame.pack();
          //frame.setResizable(false);
          frame.setVisible(true);
     public void actionPerformed(ActionEvent e){
          if(e.getSource() == exit){
               System.exit(0);
          if(e.getSource() == clear){
               textBox.setText("");
               searchResults.setText("");
          if(e.getSource() == find){
               getResultsFromFile(textBox.getText());
     public void getResultsFromFile(String patternstr){
          try{
               filereader = new FileReader("file_to_read.txt");
               reader = new Scanner(filereader);
               reader.useDelimiter(System.getProperty("line.separator"));
               Scanner splitter;
               String fileLine;
               String partialString;
               //reader.useDelimiter(System.getProperty("line.Separator"));
               while(reader.hasNext()){
                    fileLine = reader.next();
                    splitter = new Scanner(fileLine);
                    splitter.useDelimiter("\\s*,\\s*");
                    while(splitter.hasNext()){
                         partialString = splitter.next();
                         if(partialString.equals(patternstr)){
                              if(searchResults.getText().length() == 0){
                                   searchResults.setText(fileLine);
                              }else{
                                   searchResults.setText(searchResults.getText() + "\n" + fileLine);
                              //break;
                    splitter.close();
               reader.close();
               filereader.close();
               }catch(IOException e) {
               JOptionPane.showMessageDialog(null, e.getMessage(), "ERROR", JOptionPane.ERROR_MESSAGE);
     public static void main(String args[]){
          new UsingScannerPattern("Using paterns");
}