The java.math.BigDecimal.precision() method returns the precision of this BigDecimal. The precision refers to the number of digits in the unscaled value.
Syntax:
public int precision()
Parameters: This method does not accept any parameters.
Return Value: This method returns an integer which denotes the precision of this BigDecimal object.
Examples:
Input : 198.176 Output : 6 Input : 721111.111 Output : 9
Below programs illustrate the java.math.BigDecimal.precision() function in Java:
Program 1:
import java.math.*;import java.io.*;  class GFG {    public static void main(String[] args)    {        // create 2 BigDecimal Objects        BigDecimal b1, b2;          // Assigning values to b1, b2        b1 = new BigDecimal("198.176");        b2 = new BigDecimal("721111.111");          // Display their respective precision        System.out.println("The precision of " + b1 + " is " + b1.precision());        System.out.println("The precision of " + b2 + " is " + b2.precision());    }} |
Output:
The precision of 198.176 is 6 The precision of 721111.111 is 9
Program 2:
// Java program to illustrate// precision() Functionimport java.math.*;import java.io.*;  class GFG {    public static void main(String[] args)    {        // Creating a BigDecimal Object        BigDecimal num;          // Assigning value 0.1 + 0.1 + 0.1 to num        num = new BigDecimal("0.1")                  .add(new BigDecimal("0.1"))                  .add(new BigDecimal("0.1"));          // Display the BigDecimal value and its precision        System.out.println("The precision of " + num + " is "        + num.precision());    }} |
Output:
The precision of 0.3 is 1
Reference: https://docs.oracle.com/javase/7/docs/api/java/math/BigDecimal.html#precision()
