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How can generate absolute unique number without using complicated math functions
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JavaFAQ Home » Security
Question: How can I generate absolute
unique number without using complicated math functions? Not pseudo random from
Java API...
I do not need it for high security; I need to have a unique Id for database
connection...
Answer:
Combine any of the following:
- IP address
- process id
- random number (from Java API)
- Date(month,day,year)
- Time(hour,minute,second, millisecond) and then put them together like this:
IPIPIPMonthDayYearHourSecond...Id..RND...
You can also put them in different order each time when you do it
| Code: |
//Here just simplest example on random() usage..
//Real working code is up to you :-)
public class RandomNumbers {
private static void doRawRandomNumber() {
double rawRandomNumber;
rawRandomNumber = Math.random();
System.out.println("-------------------------------------------------");
System.out.println("Raw random number : " + rawRandomNumber);
System.out.println("-------------------------------------------------");
System.out.println("\n");
}
/**
* Sole entry point to the class and application.
* @param args Array of String arguments.
*/
public static void main(String[] args) {
doRawRandomNumber();
}
}
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Some another Java code examples for Math.random() you
can find here
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