To get the coming Sunday from the current date or specified date, write the following code:

public static Date getNearestWeekend(Date date)
{
    try {
        Calendar c = Calendar.getInstance();
        Calendar cal1 = Calendar.getInstance();
        // Here you will set cpecified date if provided
        if(date != null)
            c.setTime(date);
        c.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
       // Her we will set cureent date
        cal1.setTime(getCurrentDate());
        //here we will check if the sunday has passed or not, if yes then will add 7 that will give coming Sunday
        if(c.get(Calendar.DAY_OF_MONTH) < cal1.get(Calendar.DAY_OF_MONTH))
            c.add(Calendar.DATE,7);

        //This will print the coming Sunday date if Sunday has passes otherwise it will print current Sunday
        System.out.println("Date: "+c.getTime());
        return c.getTime();
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}