Praktikum 3: Code fertig, Anfang Tests
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package de.joethei.hs.java2.praktikum.praktikum3;
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import java.io.IOException;
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public class TextFormatException extends IOException {
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public TextFormatException(String s) {
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super(s);
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}
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}
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package de.joethei.hs.java2.praktikum.praktikum3;
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import java.util.List;
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public class Vorlesung {
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private String studiengruppe;
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private String title;
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private String dozent;
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private String teilnehmerzahl;
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public Vorlesung(List<String> list) throws TextFormatException{
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if(list.size() <1 || list.size() > 4) throw new TextFormatException("invalid number of Strings in list");
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this.studiengruppe = list.get(0);
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this.title = list.get(1);
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this.dozent = list.get(2);
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this.teilnehmerzahl = list.get(3);
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}
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public String getStudiengruppe() {
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return studiengruppe;
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}
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public String getTitle() {
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return title;
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}
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public String getDozent() {
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return dozent;
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}
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public String getTeilnehmerzahl() {
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return teilnehmerzahl;
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}
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@Override
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public String toString() {
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return studiengruppe + ":" + title + ":" + dozent + ":" + teilnehmerzahl;
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}
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}
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package de.joethei.hs.java2.praktikum.praktikum3;
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import java.io.*;
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import java.util.*;
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public class Vorlesungsverzeichnis {
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private Set<Vorlesung> vorlesungen = new HashSet<>();
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public Vorlesungsverzeichnis(String filename) throws IOException {
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List<List<String>> datenbasis;
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datenbasis = load(filename);
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for(List<String> a : datenbasis) {
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if(a.size() != 4) throw new TextFormatException("unexpected number of Strings in line");
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vorlesungen.add(new Vorlesung(a));
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}
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}
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private List<List<String>> load(String filename) throws IOException {
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List<List<String>> result = new ArrayList<>();
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BufferedReader br = new BufferedReader(new FileReader(filename));
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for (String line=br.readLine(); line!=null; line=br.readLine())
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result.add(Arrays.asList(line.split(":")));
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br.close();
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return result;
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}
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public List<String> titles() {
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List<String> list = new ArrayList<>();
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for(Vorlesung v: this.vorlesungen) {
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list.add(v.getTitle());
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}
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Collections.sort(list);
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return list;
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}
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public Set<String> workaholics() {
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Set<String> s = new HashSet<>();
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List<String> list = new ArrayList<>();
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for(Vorlesung v:vorlesungen) {
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list.add(v.getDozent());
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s.add(v.getDozent());
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}
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for(String name:s) {
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list.remove(name);
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}
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return new HashSet<>(list);
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}
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public Map<String, List<String>> groupToTitles() {
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Map<String, List<String>> map = new HashMap<>();
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List<String> list = new ArrayList<>();
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Set<String> s = new HashSet<>();
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for(Vorlesung v:vorlesungen) {
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s.add(v.getStudiengruppe());
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}
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for(String gruppe : s) {
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for(Vorlesung v : vorlesungen) {
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if(gruppe.equals(v.getStudiengruppe())) {
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list.add(v.getTitle());
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}
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}
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map.put(gruppe, list);
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list = new ArrayList<>();
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}
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return map;
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}
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public Map<String, List<String>> multipleTitles() {
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Map<String, List<String>> map = new HashMap<>();
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List<String> list = new ArrayList<>();
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Set<String> s = new HashSet<>();
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for(Vorlesung v:vorlesungen) {
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s.add(v.getTitle());
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}
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for(String title : s) {
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for(Vorlesung v:vorlesungen) {
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if(title.equals(v.getTitle())) {
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list.add(v.getDozent());
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}
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}
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map.put(title, list);
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list = new ArrayList<>();
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}
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List<String> l = new ArrayList<>(map.keySet());
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for(String title:l) {
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if(map.get(title).size() < 2) map.remove(title);
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}
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return map;
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}
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public List<String> descendingTitles() {
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List<String> l = new ArrayList<>();
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List<Vorlesung> vl = new ArrayList<>(vorlesungen);
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int most=0, index=0;
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while(vl.size()>0) {
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for(int i=0; i<vl.size(); i++) {
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if(Integer.parseInt(vl.get(i).getTeilnehmerzahl())>=most) {
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most = Integer.parseInt(vl.get(i).getTeilnehmerzahl());
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index=i;
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}
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}
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most=0;
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l.add(vl.get(index).getTitle());
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vl.remove(index);
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}
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return l;
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}
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}
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6
src/main/resources/vorlesungen.txt
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6
src/main/resources/vorlesungen.txt
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I2:Java 2:Rump:100
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I2:Algorithmen und Datenstrukturen:Totzauer:80
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MT2:Mathematik 2:von Coelln:60
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MT2:Audio-/Videotechnik:Lemke:50
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E2:Mathematik 2:Rabe:70
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I4:Rechnerarchitekturen:von Coelln:45
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package de.joethei.hs.java2.tests;
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import de.joethei.hs.java2.praktikum.praktikum3.Vorlesungsverzeichnis;
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import org.junit.Test;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Objects;
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import static org.junit.Assert.*;
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public class VorlesungsverzeichnisTest {
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@Test(expected = IOException.class)
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public void constructors() throws IOException {
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new Vorlesungsverzeichnis("HalloWelt");
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}
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@Test
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public void titles() {
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try {
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Vorlesungsverzeichnis vorlesungsverzeichnis = new Vorlesungsverzeichnis(Objects.requireNonNull(getClass().getClassLoader().getResource("vorlesungen.txt")).getFile());
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List<String> titles = new ArrayList<>();
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titles.add("Algorithmen und Datenstrukturen");
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titles.add("Audio-/Videotechnik");
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titles.add("Java 2");
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titles.add("Mathematik 2");
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titles.add("Mathematik 2");
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titles.add("Rechnerarchitekturen");
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assertEquals(vorlesungsverzeichnis.titles(), titles);
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titles.add("Hallo Welt");
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assertNotEquals(vorlesungsverzeichnis.titles(), titles);
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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