Java.math.BigInteger.toString() Method



The java.math.BigInteger.toString(int radix) returns the String representation of this BigInteger in the given radix. If the radix is outside the range from Character.MIN_RADIX to Character.MAX_RADIX inclusive, it will default to 10 (as is the case for Integer.toString).

The digit-to-character mapping provided by Character.forDigit is used, and a minus sign is prepended if appropriate. This representation is compatible with the (String, int) constructor.


Following is the declaration for java.math.BigInteger.toString() method

public String toString(int radix)


  • radix - radix of the String representation

Return Value

This method returns the String representation of this BigInteger in the given radix.


  • NA


The following example shows the usage of math.BigInteger.toString() method

package com.tutorialspoint;

import java.math.*;

public class BigIntegerDemo {

public static void main(String[] args) {

	// create 2 BigInteger objects
	BigInteger bi1, bi2;

	// create 2 String objects
	String s1, s2;

	bi1 = new BigInteger("16");
	bi2 = new BigInteger("-16");

	// assign String value of bi1, bi2 to s1, s2 using radix
	s1 = bi1.toString(8); // octal value of bi1
	s2 = bi2.toString(2); // binary value of bi2

	String str1 = "String value of " +bi1+ " in radix 8 is " +s1;
	String str2 = "String value of " +bi2+ " in radix 2 is " +s2;

	// print s1, s2 values
	System.out.println( str1 );
	System.out.println( str2 );

Let us compile and run the above program, this will produce the following result:

String value of 16 in radix 8 is 20
String value of -16 in radix 2 is -10000