public class AngPol {

public static void main(String args[]) {
Scanner abc = new Scanner(System.in).useDelimiter("\n");
Slownik dic = new Slownik();
String input = "";

while (true) {
if (abc.hasNext()) {
input = abc.next();
}
if (input.matches("^([^!]+)")) {
System.out.println(dic.get(input.split(" ")[0]));
}
else if (input.matches("^!remove\\s(.+)?")) {
dic.remove(input.split(" ")[1]);
}
else if (input.matches("^!add\\s(.+)?\\s(.+)?")) {
dic.add(input.split(" ")[1], input.split(" ")[2]);
}
else if (input.matches("^!exit")) {
dic.exit();
break;
}
}
}
}

class Slownik {

private Map<String, String> slowniczek = new HashMap<String, String>();

public void add(String pol, String eng) {
slowniczek.put(pol, eng);
}

public boolean remove(String slowko) {
if (slowniczek.containsKey(slowko)) {
slowniczek.remove(slowko);
return true;
}
else if (slowniczek.containsValue(slowko)) {
for ( String xyz : slowniczek.keySet() ) {
if (slowniczek.get(xyz).equals(slowko)) {
slowniczek.remove(xyz);
return true;
}
}
}
return false;
}

public String get(String slowko) {
if (slowniczek.containsKey(slowko)) {
return slowniczek.get(slowko);
}
else if (slowniczek.containsValue(slowko)) {
for ( String xyz : slowniczek.keySet() ) {
if (slowniczek.get(xyz).equals(slowko)) {
return xyz+"\n";
}
}
}
return "Nie ma takiego słówka w bazie\n";
}

//potrzebne do exit() i nie tylko ...:
FileInputStream plik;
BufferedReader input;
BufferedWriter output;

public void exit() {
try {
input.close();
output = new BufferedWriter(new FileWriter("ang-pol.dic"));
for ( String xyz : slowniczek.keySet() ) {
output.write(xyz + " " + slowniczek.get(xyz) + "\n");
}
output.close();
}
catch (IOException e) {
System.out.println("Coś nie tak z zapisem lub odczytem!! Pokombinuj jeszcze raz...\n");
System.exit(0);
}
}

public Slownik() {
try {
plik = new FileInputStream("ang-pol.dic");
input = new BufferedReader(new InputStreamReader(new DataInputStream(plik)));
String linia;
while ((linia = input.readLine()) != null) {
String slowo[] = linia.split(" ");
if (slowo.length == 2) {
slowniczek.put(slowo[0], slowo[1]);
}
}
}
catch (IOException e) {
System.out.println("Coś nie tak z zapisem lub odczytem!! Pokombinuj jeszcze raz...\n");
System.exit(0);
}
}

}

Free free to experiment with the code to change the layout of the text box. Cheers!

PS: I see quotes (" and ') have been altered by Wordpress, or atleast it displays them all altered, but internally keeps the original. If it the case, change them to normal quotes.

To see how the search box looks like, please see here.