PLz i really need help on this final thing

[jason27131]

I want to be able to read strings from a file, and search if a word im looking for is in there. if it is, a message pane will pop up saying yes. if not, then it will say no. Right now, i can't seem to get the two methods to connect. THeres always an error.

Code:
import java.io.*;
import java.util.*;
import java.awt.Color;
import javax.swing.*;

public class AccessFile {
public String phrase;

public void displayFile(String f) throws IOException {
String phrase = f;
FileReader fr = new FileReader(f);
BufferedReader br = new BufferedReader(fr);


f = br.readLine();
while (f != null) {
System.out.println(f);
f = br.readLine();
}

br.close();
fr.close();
}

public void search(){
UIManager.put("OptionPane.background", Color.white);
UIManager.put("Panel.background", Color.white);
String word = JOptionPane.showInputDialog (null, "Please enter the word you are looking for", "Find", JOptionPane.OK_CANCEL_OPTION);

StringTokenizer st = new StringTokenizer(phrase);// Created a new object, that will allow me to tokenize String.

/** Basically, boolean starts out as false. if the StringTokenizer st has more token, it will keep
* reading each word. If one of the words in the string equal to the word the user entered, then
* boolean will turn true.
*/

boolean compare = false;

while (st.hasMoreTokens())
{
if (st.nextToken().equals (word))
compare = true;

}
/** If boolean was true, then it will show up the message screen saying word found. If boolean isn't true, then
* a screen will pop up saying you sure you entered it correctly.
*/

if (compare){
JOptionPane.showMessageDialog (null, "Word Found.", "Word is found!", JOptionPane.PLAIN_MESSAGE);
System.out.println((word));
}
else{
JOptionPane.showMessageDialog (null, "You sure you entered it correctly?", "Word is not found!", JOptionPane.PLAIN_MESSAGE);
}
}
}

Error:
NullPointerException:
at java.util.StringTokenizer.<init>(Unknown Source)
at java.util.StringTokenizer.<init>(Unknown Source)
at AccessFile.search(AccessFile.java:30)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source)
at java.lang.reflect.Method.invoke(Unknown Source)
>

PLz help. i really need it. Some tips, editing of the code, etc.

[hardwired]

Code:

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

public class AccessFileRx {
    public AccessFileRx() {
        UIManager.put("OptionPane.background", Color.white);
        UIManager.put("Panel.background", Color.white);
        // Step-by-step:
        String fileName = getFileName();
        String phrase = getSearchPhrase();
        boolean success = searchFile(fileName, phrase);
        showResult(success, phrase);
    }

    private String getFileName() {
        String name = JOptionPane.showInputDialog (null, "Please enter the " +
                                      "name of the file you want to search", "Find",
                                       JOptionPane.OK_CANCEL_OPTION);
        return name;
    }

    private String getSearchPhrase() { 
        String word = JOptionPane.showInputDialog (null, "Please enter the " +
                                      "word you are looking for", "Find",
                                       JOptionPane.OK_CANCEL_OPTION);
        return word;
    }

    private boolean searchFile(String fileName, String s) {
        boolean found = false;

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

            String f = br.readLine();
            while (f != null) {
                // Check for the word or exact phrase.
                if(f.indexOf(s) != -1) {
                    found = true;
                    break;
                }
                f = br.readLine();
            }

            br.close();
            fr.close();
        } catch(IOException e) {
            System.err.println("Read error: " + e.getMessage());
        }

        return found;
    }

    private void showResult(boolean result, String word) {
        /** If boolean was true, then it will show up the message screen
         *  saying word found. If boolean isn't true, then a screen will
         *  pop up saying you sure you entered it correctly.
         */

        if (result){
            JOptionPane.showMessageDialog (null, "Word Found.", "Word is found!",
                                           JOptionPane.PLAIN_MESSAGE);
            System.out.println((word));
        } else {
            JOptionPane.showMessageDialog (null, "You sure you entered it correctly?",
                                  "Word is not found!", JOptionPane.PLAIN_MESSAGE);
        }
    }

    public static void main(String[] args) {
        new AccessFileRx();
    }
}

[jason27131]

can u explain it? or document it. im trying to learn java still