Create BigInteger via long type variable

   
import java.math.BigInteger;

public class Main {
  public static void main(String[] argv) throws Exception {
    // Create via a string
    BigInteger bi1 = new BigInteger("1234567890123456890");

    // Create via a long
    BigInteger bi2 = BigInteger.valueOf(123L);

    bi1 = bi1.add(bi2);

  }
}

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Create BigInteger via long type variable : BigInteger « Data Type « Java

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