How would I rewrite SELECT NEXT_DAY(SYSDATE, 'Sunday') NEXT_SUNDAY FROM DUAL in Java?

Hi everyone,
Being new to Java, I am finding that things I took for granted in SQL and PL/SQL are far from "second nature" here!
Would someone tell me how would I rewrite the following in Java (for ADF)? My Google and OTN Community searches are coming up empty-handed. Any function in which I pass a date and get a date back for the next Sunday is fine, i.e., I don't need the SQL.
select
next_day(sysdate, 'Sunday') next_sunday
from dual;
Thanks in advance!
James

    public void calculateNextDay()
        Calendar c=Calendar.getInstance();
        c.set(Calendar.DAY_OF_WEEK,Calendar.SUNDAY);
        c.set(Calendar.HOUR_OF_DAY,0);
        c.set(Calendar.MINUTE,0);
        c.set(Calendar.SECOND,0);
        DateFormat df=new SimpleDateFormat("EEE yyyy/MM/dd HH:mm:ss");
        //PRINT PAST SUNDAY
        System.out.println("past sunday  - " + df.format(c.getTime()));     
        c.add(Calendar.DATE,7);
        //PRINT NEXT SUNDAY
        System.out.println("next sunday  - " + df.format(c.getTime()));     
        c.add(Calendar.DATE,7);       

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