Java: How to set Precision for double value?

This is an easy way to do it:

String formato = String.format("%.2f");

It sets the precision to 2 digits.

If you only want to print, use it this way:

System.out.printf("%.2f",123.234);

To set precision for double values DecimalFormat is good technique. To use this class import java.text.DecimalFormat and create object of it for example

double no=12.786;
DecimalFormat dec = new DecimalFormat("#0.00");
System.out.println(dec.format(no));

So it will print two digits after decimal point here it will print 12.79

You can't set the precision of a double (or Double) to a specified number of decimal digits, because floating-point values don't have decimal digits. They have binary digits.

You will have to convert into a decimal radix, either via BigDecimal or DecimalFormat, depending on what you want to do with the value later.

See also my answer to this question for a refutation of the inevitable *100/100 answers.

You can try BigDecimal for this purpose

Double toBeTruncated = new Double("3.5789055");

Double truncatedDouble = BigDecimal.valueOf(toBeTruncated)
    .setScale(3, RoundingMode.HALF_UP)
    .doubleValue();