Quellcode

javac Kalendergenerator.java
java Kalendergenerator

Quellcode

eingabe_text = eingabe1.getText();
eingabe = Integer.parseInt(eingabe_text);

Quellcode

try {
    eingabe = Integer.parseInt(eingabe1.getText());
} catch (NumberFormatException e) {
    System.err.println("Es wurde keine Ganzzahl eingegeben.");
    return;
}

Quellcode

yogi@loplop:~$ cal
    January 2006
Su Mo Tu We Th Fr Sa
 1  2  3  4  5  6  7
 8  9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31

Quellcode

GregorianCalendar now = new GregorianCalendar();
            boolean leapYear = now.isLeapYear(now.get(Calendar.YEAR));
            System.out.println(leapYear);

Quellcode

DateFormat df = DateFormat.getInstance();
Date from;

// transform the text form the textfield to a date
String fromDate = eingabe1.getText();
try
{
      from = df.parse(fromDate);
}
catch (ParseException e1) // the user didn't give in a valid date
{
      from = new Date(); // default date equals now
}

Quellcode

GregorianCalendar now = new GregorianCalendar();
now.setTime(from);
boolean leapYear = now.isLeapYear(now.get(Calendar.YEAR));
System.out.println(leapYear);

Quellcode

GregorianCalendar now = new GregorianCalendar();
             boolean leapYear = now.isLeapYear(2004);
             System.out.println(leapYear);