Initl commit of exercise 1

de.hhn.ai.prog2.blatt6.collections/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

de.hhn.ai.prog2.blatt6.collections/.project

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<projectDescription>
+  <name>de.hhn.ai.prog2.blatt6.collections</name>
+  <comment/>
+  <projects>
+    </projects>
+  <buildSpec>
+    <buildCommand>
+      <name>org.eclipse.jdt.core.javabuilder</name>
+      <arguments>
+            </arguments>
+    </buildCommand>
+  </buildSpec>
+  <natures>
+    <nature>org.eclipse.jdt.core.javanature</nature>
+  </natures>
+</projectDescription>

de.hhn.ai.prog2.blatt6.collections/.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.source=1.8

de.hhn.ai.prog2.blatt6.collections/.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "java",
+            "name": "Debug (Launch) - Current File",
+            "request": "launch",
+            "mainClass": "${file}"
+        },
+        {
+            "type": "java",
+            "name": "Debug (Launch)-App<de.hhn.ai.prog2.blatt6.collections>",
+            "request": "launch",
+            "mainClass": "app.App",
+            "projectName": "de.hhn.ai.prog2.blatt6.collections",
+            "console": "integratedTerminal",
+        }
+    ]
+}

de.hhn.ai.prog2.blatt6.collections/src/app/App.java

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+package app;
+
+import java.util.Scanner;
+
+public class App {
+
+    public static void main(String[] args) throws Exception {
+        Studentenverwaltung verwaltung = new Studentenverwaltung();
+        Scanner scanner = new Scanner(System.in);
+        String[] inputData = new String[2];
+        InputState inputState = InputState.DEFAULT;
+
+        System.out.print("Herzlich Willkommen bei der Studentenverwaltung.\n"
+                + "Bitte verwenden Sie:\n list   -> um alle Studenten anzuzeigen\n"
+                + " add    -> um einen Studenten hinzuzufügen\n remove -> um einen Studenten zu entfernen\n"
+                + " quit   -> um das Progrmam zu beenden\n> ");
+
+        verwaltung.immatrikulieren("Mustermann", "Max", 123456);
+
+        loop: while (scanner.hasNextLine()) {
+            String line = scanner.nextLine().toString();
+            switch (inputState) {
+            case DEFAULT:
+                switch (line.toLowerCase()) {
+                case "q":
+                case "quit":
+                    break loop;
+                case "list":
+                    verwaltung.listeAusgeben();
+                    System.out.print("> ");
+                    break;
+                case "add":
+                    inputState = InputState.ADD1;
+                    System.out.print("Nachname: ");
+                    break;
+                case "remove":
+                    inputState = InputState.REMOVE;
+                    System.out.print("Matrikelnummer: ");
+                    break;
+                default:
+                    System.out.print("Fehler: Kommando exisitert nicht. Bitte versuchen Sie es erneut...\n> ");
+                    break;
+                }
+                break;
+            case ADD1:
+                inputData[0] = line;
+                inputState = InputState.ADD2;
+                System.out.print("Vorname: ");
+                break;
+            case ADD2:
+                inputData[1] = line;
+                inputState = InputState.ADD3;
+                System.out.print("Matrikelnummer: ");
+                break;
+            case ADD3:
+                inputState = InputState.DEFAULT;
+                try {
+                    verwaltung.immatrikulieren(inputData[0], inputData[1], Integer.parseInt(line));
+                    System.out.print("Student wurde erfolgreich immatrikuliert!\n> ");
+                } catch (IllegalArgumentException e) {
+                    System.out
+                            .print("Student konnte nicht immatrikuliert werden. Bitte versuchen Sie es erneut...\n> ");
+                }
+                break;
+            case REMOVE:
+                inputState = InputState.DEFAULT;
+                try {
+                    verwaltung.exmatrikulieren(Integer.parseInt(line));
+                    System.out.print("Student wurde erfolgreich exmatrikuliert!\n> ");
+                } catch (IllegalArgumentException e) {
+                    System.out
+                            .print("Student konnte nicht exmatrikuliert werden. Bitte versuchen Sie es erneut...\n> ");
+                }
+                break;
+            }
+        }
+        scanner.close();
+    }
+}

de.hhn.ai.prog2.blatt6.collections/src/app/InputState.java

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+package app;
+
+public enum InputState {
+    DEFAULT, ADD1, ADD2, ADD3, REMOVE;
+}

de.hhn.ai.prog2.blatt6.collections/src/app/Studentenverwaltung.java

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+package app;
+
+import java.util.HashMap;
+
+public class Studentenverwaltung {
+    private HashMap<Integer, Studi> studis = new HashMap<Integer, Studi>();
+
+    public void immatrikulieren(String name, String vorname, int matrikelnummer) {
+        if (studis.get(matrikelnummer) != null)
+            throw new IllegalArgumentException(); // geprüfte Exception ??
+        else
+            studis.put(matrikelnummer, new Studi(name, vorname, matrikelnummer));
+    }
+
+    public void exmatrikulieren(int matrikelnummer) {
+        if (studis.remove(matrikelnummer) == null)
+            throw new IllegalArgumentException(); // Fehlermeldung ausgegeben ??
+    }
+
+    public void listeAusgeben() {
+        studis.forEach((k, v) -> System.out.println(k + ": " + v.getName() + " " + v.getLastName()));
+    }
+}

de.hhn.ai.prog2.blatt6.collections/src/app/Studi.java

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+package app;
+
+public class Studi {
+    private String lastName;
+    private String name;
+    private int number;
+
+    public Studi(String lastName, String name, int number) {
+        this.lastName = lastName;
+        this.name = name;
+        this.number = number;
+    }
+
+    private boolean checkName(String name) {
+        if (name.length() < 2)
+            throw new IllegalArgumentException();
+        return true;
+    }
+
+    public String getLastName() {
+        return this.lastName;
+    }
+
+    public void setLastName(String lastName) {
+        if (checkName(lastName))
+            this.lastName = lastName;
+    }
+
+    public String getName() {
+        return this.name;
+    }
+
+    public void setName(String name) {
+        if (checkName(name))
+            this.name = name;
+    }
+
+    public int getNumber() {
+        return this.number;
+    }
+
+    public void setNumber(int number) {
+        if (number > 99999 && number < 1000000)
+            this.number = number;
+        else
+            throw new IllegalArgumentException();
+    }
+
+}