Format decimal

In this chapter you will learn:

How to format decimal value
How to combine formatter specifiers

Format decimal with %f

To format a floating-point value in decimal format, use %f.

import java.util.Formatter;
//from  j a  va  2  s  .  c om
public class MainClass {
  public static void main(String args[]) {
    Formatter fmt = new Formatter();
    // Format 4 decimal places. 
    fmt.format("%.4f", 123.1234567); 
    System.out.println(fmt); 
  }
}

The output:

The .4 in the code above formats 4 decimal places.

Combine formatter specifiers to format both integer and decimal value

The following code combines the format specifier for integer and decimal. It also insert a character ) to display as it is.

import java.util.Formatter;
/*from  j  av a  2 s  . com*/
public class MainClass {

  public static void main(String[] args) throws Exception {
    StringBuilder buf = new StringBuilder(); // Buffer to hold output
    Formatter formatter = new Formatter(buf); // Formatter to format data into
                                              // buf
    formatter.format("%4d)%+7.2f", 2, 1234.1234);
    System.out.println(buf);

  }

}