Das Java Codebook by Peter Müller

By Peter Müller

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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.

E0 123,5E3 Die Anzahl signifikanter Stellen in der Mantisse entspricht der Summe aus obligatorischen Vorkomma- und maximaler Anzahl Nachkommastellen. Tausenderzeichen sind nicht erlaubt. Vordefinierte Patterns Wenn Sie an verschiedenen Stellen immer wieder dieselben Formatierungen benötigen, lohnt sich unter Umständen die Definition eigener vordefinierter Formate, beispielsweise in Form von static final-Konstanten, die mittels eines static-Blocks konfiguriert werden. Die folgenden Definitionen gestatten die schnelle Formatierung von Gleitkommazahlen in Exponentialschreibweise mit ̈ einer Vorkommastelle und sechs signifikanten Stellen (DFEXP), ̈ sechs signifikanten Stellen und Exponenten, die Vielfache von 3 sind (DFEXP_ENG).

Grundsätzlich gilt: Sie geben die maximale und minimale Anzahl Vorkommastellen an und das DecimalFormat-Objekt berechnet den passenden Exponenten. Aus diesem Grund kann für den Exponenten auch nur die minimale Anzahl Stellen angegeben werden. Die maximale Zahl ist unbeschränkt. Für die Berechnung des Exponenten gibt es zwei Modelle, die über den Aufbau des Vorkommateils ausgewählt werden: ̈ Besteht der Vorkommateil nur aus obligatorischen Stellen (0), berechnet DecimalFormat den Exponenten so, dass exakt die vorgegebene Zahl Stellen vor dem Komma erreicht wird.

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