truncate decimal value in java

 Methid 1:

Truncate Decimal Value In Java Using BigDecimal

import java.math.BigDecimal;

public class TruncateDecimal {

    public static void main(String[] args) {
        double num = 21.288827938373635363383838;
        System.out.println("Before truncate=" + num);
        System.out.println("After Truncate=" + truncateDecimal(num, 3));
    }

    private static BigDecimal truncateDecimal(double x, int numberofDecimals) {
        if (x > 0) {
            return new BigDecimal(String.valueOf(x)).setScale(numberofDecimals,
                    BigDecimal.ROUND_FLOOR);
        } else {
            return new BigDecimal(String.valueOf(x)).setScale(numberofDecimals,
                    BigDecimal.ROUND_CEILING);
        }
    }

}

Output:

Before truncate=21.288827938373636
After Truncate=21.288

Method 2:

public class TruncateDecimal {

    public static void main(String[] args) {
        double num = 21.288827938373635363383838;
        System.out.println("Before truncate=" + num);
        System.out.println("After Truncate=" + truncateDecimalPlaces(num));
    }

   
        public static double  truncateDecimalPlaces(double num) {

            // Get two decimal value of input valueToCheck
          return (Math.floor(num * 100) / 100);

        }
   
}   


Output:

Before truncate=21.288827938373636
After Truncate=21.28