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Pseudorandom number generators (PRNGs) use deterministic mathematical algorithms to produce a sequence of numbers with good statistical properties, but the numbers produced are not genuinely random. PRNGs usually start with an arithmetic seed value. The algorithm uses this seed to generate an output value and a new seed as well, which is used to generate the next value, and so on.
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import java.security.SecureRandom;
import java.security.NoSuchAlgorithmException;
// ...
public static void main (String args[]) {
try {
SecureRandom number = SecureRandom.getInstance("SHA1PRNG");
// Generate 20 integers 0..20
for (int i = 0; i < 20; i++) {
System.out.println(number.nextInt(21));
}
}
catch (NoSuchAlgorithmException nsae) {
// Forward to handler
}
}
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