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

By Dirk Louis; Peter Müller; Karsten Samaschke

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Example text

Im Nachkommateil darf rechts von einer optionalen Ziffer keine obligatorische Ziffer mehr folgen. Die Zahl der obligatorischen Ziffern entspricht hier der Mindestzahl an Stellen, die Summe aus obligatorischen und optionalen Ziffern der Maximalzahl an Stellen. Optional kann sich an beide Formate die Angabe eines Exponenten anschließen (siehe Rezept 9). Negative Zahlen werden standardmäßig durch Voranstellung des Minuszeichens gebildet, es sei denn, es wird dem Pattern für die positiven Zahlen mittels ; ein spezielles Negativ-Pattern angehängt.

Da die Methode getPatternsInString() einen String nach allen Vorkommen des übergebenen Musters durchsuchen soll, ruft sie find() in einer while-Schleife auf und speichert die gefundenen Übereinstimmungen in einem ArrayList-Container. group() ); return matches; } Listing 14: Strings nach beliebigen Patterns durchsuchen Die zweite Methode, getNumbersInString(), liefert im String gefundene Zahlen zurück. ) endet. Dieser reguläre Ausdruck findet ganze Zahlen, Gleitkommazahlen mit Komma zum Abtrennen der Nachkommastellen und ohne Tausenderzeichen, Zahlen mit und ohne Vorzeichen, aber auch Zahlenschrott (beispielsweise Teile englisch formatierter Zahlen, die das Komma als Tausenderzeichen verwenden).

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.

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