FileIO.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package FileSearch;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import javax.swing.JOptionPane;

/**
 *
 * @author Student
 */
public class FileIO { 
    
    static String fileName = "foo";
    
    public FileIO(String s) {
        fileName = s;
        
    }
    static void SOP(String s) {
        System.out.println(s);
    }
    
    static void dumpToFile(ArrayList<String> array) {
        boolean success = false;
        try {
            BufferedWriter fw = new BufferedWriter(new FileWriter(fileName));
            
            int k = 0;
            while (k < array.size()) {
                fw.write(array.get(k));
                SOP(array.get(k));
                fw.newLine();
                k += 1;
            }
            fw.close();
            success = true;
        if (success) {
            SOP("Successfully saved file.");
        }
        else {
            SOP("Save failed.");
        }
        }
        catch (IOException e) {
            SOP("IOException: " + e);
            success = false;
        }
        
    }
    
    static String getFromLineNo(int number, ArrayList<String> array) {
        String obtainedLine;
        obtainedLine = array.get(number);
        return obtainedLine;
    }
    
    static void message(String s) {
        JOptionPane.showMessageDialog(null, s);
    } 
    
    static int searchForLineNumber(String s, ArrayList<String> array, int lines) {
        int lnNo = 0;
        while (lnNo <= lines) {
            if (array.get(lnNo).equals(s)) {
                break;
            }
            else {
            }
            lnNo++;
        }
        return lnNo; 
    }
    
    static void readFileIntoArray(ArrayList<String> array, int lines) {        
        try {
            FileReader fr = new FileReader(fileName);
            BufferedReader br = new BufferedReader(fr);
            while (br.readLine() != null) {
                lines++;
            }
            br.close();
            fr.close();

            fr = new FileReader(fileName);
            br = new BufferedReader(fr);

            for (int j = 0; j < lines; j++) {
                array.add(j, br.readLine());
                FileIO.SOP(array.get(j));
            }

            br.close();
        }

SearchFrame.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package FileSearch;

import java.util.ArrayList;
import javax.swing.JOptionPane;

/**
 *
 * @author Student
 */
public class SearchFrame extends javax.swing.JFrame {
    ArrayList<String> arr = new ArrayList();
    int lineCounter = 0;
    FileIO IOReadWrite = new FileIO("filename.txt");
    
    public SearchFrame() {
        initComponents();
        IOReadWrite.readFileIntoArray(arr, lineCounter);
    }
    
    boolean dumpSuccess = false;
    
    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        searchField = new javax.swing.JTextField();
        searchBtn = new javax.swing.JButton();
        jLabel2 = new javax.swing.JLabel();
        addField = new javax.swing.JTextField();
        jLabel3 = new javax.swing.JLabel();
        addBtn = new javax.swing.JButton();
        saveBtn = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        searchBtn.setText("Search");
        searchBtn.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                searchBtnActionPerformed(evt);
            }
        });

        jLabel2.setText("Search");

        jLabel3.setText("Add Line");

        addBtn.setText("Add");
        addBtn.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                addBtnActionPerformed(evt);
            }
        });

        saveBtn.setText("Save");
        saveBtn.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                saveBtnActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addGap(0, 80, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(14, 14, 14)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel3)
                            .addComponent(jLabel2))
                        .addGap(34, 34, 34)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addComponent(searchField, javax.swing.GroupLayout.PREFERRED_SIZE, 148, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(addField, javax.swing.GroupLayout.PREFERRED_SIZE, 148, javax.swing.GroupLayout.PREFERRED_SIZE)))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(searchBtn)
                        .addGap(37, 37, 37)
                        .addComponent(addBtn)
                        .addGap(35, 35, 35)
                        .addComponent(saveBtn)))
                .addGap(75, 75, 75))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(56, 56, 56)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(addField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel3))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(searchField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel2))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(searchBtn)
                    .addComponent(addBtn)
                    .addComponent(saveBtn))
                .addContainerGap(47, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void searchBtnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_searchBtnActionPerformed
        // TODO add your handling code here:
        String searchString = searchField.getText();
        int k = IOReadWrite.searchForLineNumber(searchString, arr, lineCounter);
        k = k + 1;
        JOptionPane.showMessageDialog(this, "Match found on line " + k);
        
    }//GEN-LAST:event_searchBtnActionPerformed

    private void saveBtnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_saveBtnActionPerformed
        // TODO add your handling code here:
        IOReadWrite.dumpToFile(arr);
        System.exit(0);
    }//GEN-LAST:event_saveBtnActionPerformed

    private void addBtnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_addBtnActionPerformed
        // TODO add your handling code here:
        String addFieldText = addField.getText();
        IOReadWrite.SOP(addFieldText);
        arr.add(addFieldText);
    }//GEN-LAST:event_addBtnActionPerformed

    /**
     * @param args the command line arguments
     */
    
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(SearchFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(SearchFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(SearchFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(SearchFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new SearchFrame().setVisible(true);
                
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton addBtn;
    private javax.swing.JTextField addField;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JButton saveBtn;
    private javax.swing.JButton searchBtn;
    private javax.swing.JTextField searchField;
    // End of variables declaration//GEN-END:variables
}