Download Das JAVA Codebook by Dirk Louis; Peter Müller; Karsten Samaschke PDF

By Dirk Louis; Peter Müller; Karsten Samaschke

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DecimalFormat) lösen lässt. Wie dies konkret aussieht, untersuchen die beiden fol- genden Abschnitte. 1271 }; Um diese Zahlenkolonne untereinander, ausgerichtet am Dezimalzeichen, ausgeben zu können, müssen drei Dinge geschehen: 1. Die Zahlen müssen in Strings umgewandelt werden. Dies geschieht durch Erzeugung einer passenden NumberFormat- oder DecimalFormat-Instanz und Übergabe an die Methode format(), siehe Rezept 8. 2. Die gewünschte Position des Dezimalzeichens muss festgelegt werden. Hier ist zu beachten, dass die gewählte Position nicht zu weit vorne liegt, damit nicht bei der Ausgabe der Platz für die Vorkommastellen der einzelnen Strings fehlt.

Jeder Seed erzeugt genau eine vordefinierte Folge von Zufallszahlen. Wenn Sie also dem Random-Konstruktor einen festen Seed-Wert vorgeben: Random generator = new Random(3); H i n we i s erzeugt der zugehörige Zufallsgenerator bei jedem Start der Anwendung die gleiche Folge von Zufallszahlen und Sie können die Anwendung mit reproduzierbaren Ergebnissen testen. 15 Wenn Sie den Random-Konstruktor ohne Argument aufrufen (siehe vorangehende Abschnitte), wählt er den Seed unter Berücksichtigung der aktuellen Zeit.

Denkbar wäre natürlich, einfach mit indexOf() nach dem Komma zu suchen. Doch dieser Ansatz funktioniert natürlich nur, wenn DecimalFormat gemäß einer Lokale formatiert, die das Komma als Dezimalzeichen verwendet. Lauten die Alternativen demnach, entweder eigenen Code zur Unterstützung verschiedener Lokale zu schreiben oder aber eine feste Lokale vorzugeben und damit auf automatische Adaption an nationale Eigenheiten zu verzichten? Mitnichten. Sie müssen der format()-Methode lediglich als drittes Argument eine FieldPosition-Instanz übergeben und können sich dann von diesem die Position des Dezimalzeichens zurückliefern lassen.

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