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. 

Java

// 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);
    }
}

Output:

BigInteger 2300 is positive and Sing value is 1

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