How to get previous 7 dates from a particular date in java?I am getting 7 dates from present date, but I want from particular date

Question

//explain
public class DateLoop {
    static String finalDate; 
    static String particularDate;

    public static void main(String[] args) {
        // TODO Auto-         


        

Answer 1

As Uta Alexandru and Basil Bourque have said already, don’t use the long outmoted classes SimpleDateFormat and Calendar. java.time, the modern Java date and time API also known as JSR-310, is so much nicer to work with:

    DateTimeFormatter dtf = DateTimeFormatter.ofPattern("d-M-uuuu");
    LocalDate date = LocalDate.parse("2-1-2018", dtf)
            .minusDays(7);

    for(int i = 0; i < 7; i++) {
        date = date.plusDays(1);
        String finalDate = date.format(dtf);
        System.out.println(finalDate);
    }

This prints:

27-12-2017
28-12-2017
29-12-2017
30-12-2017
31-12-2017
1-1-2018
2-1-2018

Not only is the code slightly simpler and shorter, more importantly, it is clearer and more natural to read.

Question: Can I use java.time on Android?

You certainly can. It just requires at least Java 6.

• In Java 8 and later the new API comes built-in.
• In Java 6 and 7 get the ThreeTen Backport, the backport of the new classes (ThreeTen for JSR 310).
• On Android, use the Android edition of ThreeTen Backport. It’s called ThreeTenABP.

Links

• Oracle tutorial: Date Time, explaining how to use java.time.
• ThreeTen Backport project
• ThreeTenABP, Android edition of ThreeTen Backport
• Question: How to use ThreeTenABP in Android Project, with a very thorough explanation.
• Java Specification Request (JSR) 310, where the modern date and time API was first described.