BigInteger signum() Method in Java

prerequisite : BigInteger Basics 
The java.math.BigInteger.signum() method helps us to identify whether a BigInteger is positive or zero or negative. It returns one of the following values depending on the following conditions: 

• returns -1 when number is negative
• returns 0 when number is zero
• returns +1 when number is positive

Syntax:  

public int signum()

Parameters: The method does not take any parameters.
Return Value: The method returns -1, 0 or 1 as the value of this BigInteger when they are negative, zero or positive respectively.

Examples:  

Input: 2300 Output: 1 Explanation: 2300 is positive number so the method returns 1 Input: -5482549 Output: -1

Below program illustrate the signum() method of BigInteger. 

// Program Demonstrate signum() method of BigInteger  import java.math.*; public class GFG {  public static void main(String[] args)  {  // Creating BigInteger object  BigInteger biginteger = new BigInteger("2300");  // Call signum() method on bigInteger  // store the return value as int  int sigvalue = biginteger.signum();  // Depending upon sign value find sign of biginteger  String sign = null;  if (sigvalue == 0)  sign = "zero";  else if (sigvalue == 1)  sign = "positive";  else  sign = "negative";  // Defining result  String result = "BigInteger " + biginteger + " is " +   sign + " and Sing value is " + sigvalue;  // Print result  System.out.println(result);  } } 

BigInteger 2300 is positive and Sing value is 1

Reference:https://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html#signum()