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if one enters a phone number it should give the corresponding words from dictionary

This is my code,Dictionary is a txt document that contain:
an
blau
Bo"
Boot
bo"s
da
Fee
fern
Fest

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.util.ArrayList;
import java.util.Scanner;
import...

Please help me out

it returns phWordsFromDict = "" i.e. an empty String

public static String getDictPhoneWord (String prefix) {

System.out.println(" :: Inside getDictPhoneWord :: prefix = "+prefix);
String current_word = "";
String phWordsFromDict = "";...

HI,
I have to write a piece of code in which i have String that can contain a word from a dictionary, that String is named 'prefix' and the dictionary word is current_word,How can i traverse through...