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How to set Precision for Double values in Java?

  • Difficulty Level : Medium
  • Last Updated : 13 May, 2021

Given a double value val, the task is to set its precision value to a specific decimal places. 
Examples: 
 

Input: val = 1 
Output: 1.0000
Upto 4 decimal places

Input : 12.5
Output : 12.500000
Upto 6 decimal places
 

Approach: Using String.format() 
We can use String.format() method to format the decimal number to some specific format.

Syntax:

String.format("%.Df", decimalValue);

where D is the number required number of Decimal places.

Below is the implementation of the above approach:

Java




import java.io.*;
import java.lang.*;
 
class GFG {
  public static void main(String[] args) {
 
    double a = 0.9;
 
    // Setting the precision to 20 places
    System.out.println(
      String.format("%.20f", a));
 
    double b = 1;
 
    // Setting the precision to 5 places
    System.out.println(
      String.format("%.5f", b));
  }
}
Output
0.90000000000000000000
1.00000

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