Crear un objeto calendar con la fecha actual en java

Crear un objeto calendar con la fecha actual en java

Calendar.getInstance() devuelve un objeto GregorianCalendar cuyos campos and sido inicializados con la fecha y hora actual:

Calendar rightNow = Calendar.getInstance();

int julianDay = rightNow.get(Calendar.DAY_OF_YEAR);
int ccyy = rightNow.get(Calendar.YEAR);
int month = rightNow.get(Calendar.MONTH) + 1;
int day = rightNow.get(Calendar.DATE);
int hour12 = rightNow.get(Calendar.HOUR);
int hour24 = rightNow.get(Calendar.HOUR_OF_DAY);
int minute = rightNow.get(Calendar.MINUTE);
int second = rightNow.get(Calendar.SECOND);
int millisec = rightNow.get(Calendar.MILLISECOND);

// Create a copy of the rightNow Calendar object
Calendar baseCal = (Calendar)rightNow.clone();

// Subtract 5 days from the date
rightNow.add(Calendar.DATE, -5);

// Increments the date by one
rightNow.roll(Calendar.DATE, true);

// Decrements the date by one
rightNow.roll(Calendar.DATE, false);

// Returns true when rightNow is later than baseCal (false in this example)
boolean a = rightNow.after(baseCal);

// Returns true when rightNow is earlier than baseCal (true in this example)
boolean b = rigthNow.before(baseCal);

// Returns true when rightNow is equal to baseCal (false in this example)
boolean e = rightNow.equals(baseCal);

// Set the Calendar to a specific date (ccyy, month, day, hour, minute, second)
rightNow.set(1960, 7, 21, 10, 30, 30);

// Returns a Date object for the Calendar object
Date date = rightNow.getTime();

En el siguiente enlace puedes encontrar más informacions sobre la clase calendar:

http://java.sun.com/products/jdk/1.3/docs/api/java/util/Calendar.html