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#mooc.fi 139.MuistavaSanakirja
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package sanakirja; | |
import java.io.IOException; | |
public interface MuistavaSanakirja { | |
void lisaa(String sana, String kaannos); | |
String kaanna(String sana); | |
void poista(String sana); | |
void lataa() throws IOException; | |
void talleta() throws IOException; | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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package sanakirja; | |
import java.io.File; | |
import java.io.FileWriter; | |
import java.io.IOException; | |
import java.util.ArrayList; | |
import java.util.HashMap; | |
import java.util.Scanner; | |
public class OmaMuistavaSanakirja implements MuistavaSanakirja { | |
private String tiedostonNimi; | |
private HashMap<String, String> kaannokset; | |
private Scanner lukija; | |
public OmaMuistavaSanakirja(String tiedostonNimi) { | |
this.tiedostonNimi = tiedostonNimi; | |
this.kaannokset = new HashMap<String, String>(); | |
} | |
@Override | |
public void lisaa(String sana, String kaannos) { | |
this.kaannokset.put(sana, kaannos); | |
} | |
@Override | |
public String kaanna(String sana) { | |
return this.kaannokset.get(sana); | |
} | |
@Override | |
public void poista(String sana) { | |
this.kaannokset.remove(sana); | |
} | |
@Override | |
public void lataa() throws IOException { | |
ArrayList<String> sanat = lueSanat(); | |
for (int i = 0; i < sanat.size() - 1; i += 2) { | |
this.kaannokset.put(sanat.get(i), sanat.get(i+1)); | |
} | |
} | |
@Override | |
public void talleta() throws IOException { | |
FileWriter kirjoittaja = new FileWriter(tiedostonNimi); | |
StringBuilder sb = new StringBuilder(); | |
for (String sana : kaannokset.keySet()) { | |
sb.append(sana).append(" "); | |
sb.append(kaanna(sana)).append("\n"); | |
} | |
kirjoittaja.write(sb.toString()); | |
kirjoittaja.close(); | |
} | |
private ArrayList<String> lueSanat() { | |
File tiedosto = new File(tiedostonNimi); | |
try { | |
this.lukija = new Scanner(tiedosto, "UTF-8"); | |
} catch (Exception e) { | |
//System.out.println("Virhe: " + e.getMessage()); | |
} | |
ArrayList<String> luetut = new ArrayList<String>(); | |
if (!tiedosto.isFile()) { | |
return luetut; | |
} | |
while (lukija.hasNext()) { | |
String sana = lukija.next(); | |
if (!sana.isEmpty()) { | |
luetut.add(sana); | |
} | |
} | |
return luetut; | |
} | |
} |
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