Java String Formatting - How to format floating point using String#printf()?

[Last Updated: Nov 8, 2025]

This example shows how to format floating-point with String#printf()

The format specifiers %f is used for this purpose.

The result is formatted as a decimal number.

Types include: float, Float, double, Double, and BigDecimal

package com.logicbig.example.string;

import java.math.BigDecimal;

public class StringPrintfFloatingPoint {

    public static void main(String[] args) {
        System.out.printf("%f%n", 1.77f);
        System.out.printf("%f%n", 1.77d);
        System.out.printf("%f%n", Double.valueOf(1.77d));
        System.out.printf("%f%n", BigDecimal.valueOf(1.77d));
        //including # flag in decimal number even if the fractional portion is zero
        System.out.printf("[%#1.0f]%n", 67899d);
        System.out.printf("[%#1.2f]%n", 67899d);
        System.out.printf("[%1.0f]%n", 67899d);
    }
}

Output

Java String Formatting - How to format floating point using String#printf()?

Output

See Also