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How to generate large random numbers in Java?
For large random numbers, use BigInteger type in Java. At first, create a Random object −
Random randNum = new Random();
Now, declare a byte array and generate random bytes −
byte[] b = new byte[max]; randNum.nextBytes(b);
Now, generate a large random number with BigInteger type −
BigInteger bigInt = new BigInteger(b);
Example
import java.math.BigInteger; import java.util.Random; public class Demo { public static void main(String... a) { int max = 10; Random randNum = new Random(); byte[] b = new byte[max]; randNum.nextBytes(b); // BigInteger type BigInteger bigInt = new BigInteger(b); System.out.println("Very large random number = "+bigInt); } }
Output
Very large random number = 283258678185163472552410
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