CODEWITHSUNDEEP
javadateobjectfor-looprandom
Mario
Mario

Reputation: 29

Generating Random Date

I'm a novice Java student. I have only been studying programming for a few months at school, and so I am currently pretty bad at it, and often feel stuck doing my assignments.

Anyway, I have a question regarding an assignment. I have been looking around and not quite finding the answers I need, so I was hoping to find some help on here. It would be much appreciated. My assignment goes like this: "Write a program that creates a Date object and a Random object. Use the Random object to set the elapsed time of the Date object in a loop to 10 long values between 0 and 100000000000 and display the random longs and the corresponding date and time."

We were just introduced to the classes java.util.Random and java.util.Date to work with this assignment, and are expected to use them to create the needed Date and Random objects.

The only things I really know how to do for this assignment are how to start the code:

public class RanDate {

public static void main(String[] args) {

And how to create the loop:

for (int i = 0; i <= 10; i++) {

I'm sorry if my question was too vague, or if I didn't ask something properly. This is my first time asking for help on this site. Thank you in advance for your help.

Upvotes: 2

Views: 8565

Answers (2)

Rodrigo
Rodrigo

Reputation: 614

Try this code. I think the assignment asks for the long to be the value in the date object, but I'm not shure.

    public static void main(String[] args) {
        Long max =0L;
        Long min =100000000000L;
        //Use the date format that best suites you
        SimpleDateFormat spf = new SimpleDateFormat("dd/MM/yyyy");
        
        for (int i = 0; i <= 10; i++) {
            Random r = new Random();
            Long randomLong=(r.nextLong() % (max - min)) + min;
            Date dt =new Date(randomLong);
            System.out.println("Generated Long:"+ randomLong);
            System.out.println("Date generated from long: "+spf.format(dt));
                    
                    
        }
    }

Sample Output:

Generated Long:68625461379

Date generated from long: 05/03/1972

Upvotes: 2

Nikolas
Nikolas

Reputation: 44398

How about this?

Random rnd = new Random();
Date date = new Date(Math.abs(System.currentTimeMillis() - rnd.nextLong()));
System.out.println(date.toString());

Just subtract the actual time System.currentTimeMillis() and random generated long number with rnd.nextLong(). It's better finally wrap it all to Math.abs().

Upvotes: 4

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