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date example (major changes to the book p.191)

date example (major changes to the book p.191). public class Date{ private int day, month, year; private static final byte D = 1; private static final byte M = 1; private static final short Y = 1900; // constructors public Date(){ this (D, M, Y); }

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date example (major changes to the book p.191)

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  1. date example (major changes to the book p.191) publicclass Date{ privateint day, month, year; privatestaticfinalbyte D = 1; privatestaticfinalbyte M = 1; privatestaticfinalshort Y = 1900; // constructors public Date(){ this(D, M, Y); } public Date(int y){ this(D, M, y); } public Date(int m, int y){ this(D, m, y); } public Date(int d, int m, int y){ setDay(d); setMonth(m); setYear(y); } // selectors (the selectors are also class-methods) publicint getDay(){ return day; } publicint getMonth(){ return month; } publicint getYear(){ return year; } publicvoid setDay(int d){ day=d; } publicvoid setMonth(int m){ month=m; } publicvoid setYear(int y){ year=y; } // methods (for information about the toString method see JDK-Doc „Object“) public String toString(){ return (day+"."+month+"."+year); } }

  2. Wie teste ich meine Klasse? • Zum Testen der Date-Klasse habe ich im Projekt noch die folgende Main-Klasse angelegt.Analog könnt Ihr die Klassen, die Ihr schreibt, testen! publicclass Main { publicstaticvoid main(String[] args) { Date geburtsDatum = new Date(10, 11, 1980); Date defaultDatum = new Date(); System.out.println("geburtsDatum: "+geburtsDatum ); System.out.println("defaultDatum: "+defaultDatum ); // hier wird automatisch die .toString-Methode aufgerufen } } Das zip-File mit dem Beispielcode befindet sich auf der Webseite.

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