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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
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<classpathentry excluding="Indexverwaltung/src/" kind="src" path=""/>
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<classpathentry kind="src" path="Indexverwaltung/src"/>
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<classpathentry kind="output" path="Indexverwaltung/bin"/>
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</classpath>
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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>Dateien</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.jdt.core.javanature</nature>
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</natures>
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</projectDescription>
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import java.util.Scanner;
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public class Console {
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Scanner scan = new Scanner(System.in);
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public String readString() {
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String eingabeString = scan.nextLine();
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return eingabeString;
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}
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public char [] readCharArray() {
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String text = scan.nextLine();
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return text.toCharArray();
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}
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public boolean readBoolean() {
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return scan.nextBoolean();
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}
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}
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public class DemoConsole {
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public static void main(String[] args) throws Exception {
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Console console = new Console();
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System.out.println("Text eingeben: ");
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String text = console.readString();
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System.out.println("Gelesener Text: " + text);
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System.out.println("Text eingeben: ");
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char [] ca = console.readCharArray();
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System.out.println("Gelesenes char-Feld: ");
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for(char celement: ca)
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System.out.print(celement);
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System.out.println();
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System.out.println("Boolean eingeben: ");
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boolean b = console.readBoolean();
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System.out.println("Gelesener Wert: " + b);
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}
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}
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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-19">
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<attributes>
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<attribute name="module" value="true"/>
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</attributes>
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</classpathentry>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>
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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>Indexverwaltung</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.jdt.core.javanature</nature>
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</natures>
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</projectDescription>
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eclipse.preferences.version=1
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encoding/<project>=UTF-8
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eclipse.preferences.version=1
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org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
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org.eclipse.jdt.core.compiler.codegen.targetPlatform=19
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org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
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org.eclipse.jdt.core.compiler.compliance=19
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org.eclipse.jdt.core.compiler.debug.lineNumber=generate
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org.eclipse.jdt.core.compiler.debug.localVariable=generate
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org.eclipse.jdt.core.compiler.debug.sourceFile=generate
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org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
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org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
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org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
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org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
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org.eclipse.jdt.core.compiler.release=enabled
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org.eclipse.jdt.core.compiler.source=19
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/.DS_Store
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/.classpath
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/.project
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/Console.class
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/Datei.class
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/DemoConsole.class
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/Index.class
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/IndexUI.class
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/Indexverwaltung/
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/Zaehler.png
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/ZaehlerUI.class
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public class Datei {
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}
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import java.util.*;
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import java.io.*;
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public class Index {
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// Attribute
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private final int MAX = 10;
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private String dateiname = "Indexdatei.txt";
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private int indextabelle[]; // 0 .. MAX-1
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private RandomAccessFile eineIndexDatei;
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// Konstruktor
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public Index()
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{
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indextabelle = new int[MAX];
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// Initialisierung der indextabelle
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for(int i = 0; i < MAX; i++) indextabelle[i] = -1;
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// Kein Datensatz zu Schluessel vorhanden
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}
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// Methoden
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public void erzeugeEintrag(int schluessel, int index) throws IOException
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{
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/** Speichert zu einen Schluessel den zugehoerigen
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* Datensatz-Index in der indextabelle
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*/
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if(schluessel < MAX)
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indextabelle[schluessel] = index;
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// Aktualisieren der Indexdatei,
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// d. h. Abspeichern der Datei
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aktualisiereIndexDatei(schluessel);
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}
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public int gibIndexZuSchluessel(int schluessel)
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{
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// Gibt zu dem Schluessel den gefundenen
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// Datensatz-Index zurueck
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if(schluessel < MAX)
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return indextabelle[schluessel];
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// oder -1, wenn Schluessel zu gross ist
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else
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return -1;
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}
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public void ladeIndexDatei() throws IOException
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{
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/** Liest die Indextabelle vollstaendig aus einer Datei
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* Dies geschieht nur beim Start des Programms
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*/
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eineIndexDatei = new RandomAccessFile(dateiname, "r");
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int index;
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for(int schluessel = 0; schluessel < MAX; schluessel++)
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{
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index = eineIndexDatei.readInt();
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indextabelle[schluessel] = index;
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}
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eineIndexDatei.close();
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}
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public void speichereIndexDatei() throws IOException
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{
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/** Speichert die Indextabelle vollstaendig in einer Datei
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* Dies geschlieht beim beenden des Programs
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*/
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eineIndexDatei = new RandomAccessFile(dateiname, "rw");
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for(int schluessel = 0; schluessel < MAX; schluessel++)
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eineIndexDatei.writeInt(indextabelle[schluessel]);
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eineIndexDatei.close();
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}
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private void aktualisiereIndexDatei(int schluessel) throws IOException
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{
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/** Aktualisiert die indextabelle in der Indexdatei
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* Dies geschliet beim Hinzufuegen eines neuen
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* Indexes oder Aendern eines alten Indexes
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*/
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eineIndexDatei = new RandomAccessFile(dateiname, "rw");
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// eine int-Zahl belegt 4 Bytes
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eineIndexDatei.seek((long)(schluessel * 4));
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eineIndexDatei.writeInt(indextabelle[schluessel]);
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eineIndexDatei.close();
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}
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// Zum Testen
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public void gibIndextabelleAus()
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{
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int schluessel = 0;
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for(int element : indextabelle)
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{
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System.out.println(schluessel + " " + element);
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schluessel++;
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}
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}
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}
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public class IndexUI {
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public static void main(String[] args) {
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// TODO Auto-generated method stub
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}
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}
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public class ZaehlerUI {
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public static void main(String[] args) throws Exception {
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Zaehler einZaehler, klonZaehler = null;
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Verbraucher einVerbraucher = new Verbraucher("Schulz");
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einZaehler = new Zaehler("Elektro", einVerbraucher, 123);
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try
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{
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klonZaehler = einZaehler.clone();
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}
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catch(CloneNotSupportedException e)
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{
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System.out.println("Fehler");
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}
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System.out.println("Zählerstand =" + einZaehler.getZaehlerstand()
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+ " gehört zu Verbraucher " + einZaehler.getMeinVerbraucher().getName());
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System.out.println("Geklonter Zähler Zählerstand = " + klonZaehler.getZaehlerstand()
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+ " gehört zu Verbraucher " + klonZaehler.getMeinVerbraucher().getName());
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if(einZaehler.getMeinVerbraucher() == klonZaehler.getMeinVerbraucher())
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System.out.println("Verbraucher identisch");
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else
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System.out.println("Verbraucher nicht identisch");
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Unterzaehler nochEinZaehler = new Unterzaehler("Gas", einVerbraucher, 500);
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System.out.println("Zählerstand = " + nochEinZaehler.getZaehlerstand()
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+ " Unterzählerstand: " + nochEinZaehler.getUnterzaehlerstand()
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+ " gehört zu Verbraucher " + nochEinZaehler.getMeinVerbraucher().getName());
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Unterzaehler klonUnterzaehler = null;
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try
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{
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klonUnterzaehler = nochEinZaehler.clone();
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}
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catch(CloneNotSupportedException e)
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{
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System.out.println("Fehler");
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}
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System.out.println("Geklonter Unterzähler: Zählerstand = " + klonUnterzaehler.getZaehlerstand()
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+ " Unterzählerstand: " + klonUnterzaehler.getUnterzaehlerstand()
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+ " gehört zu Verbraucher " + klonUnterzaehler.getMeinVerbraucher().getName());
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}
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}
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@ -1,6 +1,6 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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||||
<name>übung2</name>
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<name>Mein_git</name>
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<comment></comment>
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<projects>
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</projects>
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Loading…
Reference in New Issue