double value = 123456.120001;
System.out.printf("value =%5.2f", value);   

value =123456.12

Conversion Codes

To print a percent sign, use two percent signs in a row:

double finalGrade = 97.45;
System.out.printf("Grade: %4.1f%%", finalGrade); 

Output:

Grade: 97.5%

Here are some additional conversion codes. Only floating point types use the precision part of a format specifier.

Conversion Code	Type	Example Output
b	boolean	true
c	character	B
d	integer (output as decimal)	221
o	integer (output as octal)	335
x	integer (output as hex)	dd
f	floating point	45.356
e	floating point (scientific notation)	-8.756e+05
s	String	Hello World
n	newline

The example program uses some of these conversion codes in its format specifiers:

public class ConvCodes
{
  public static void main ( String[] args )
  {
    boolean r = true;
    char b = 'B';
    int adrs = 221;
    long date = 1666;
    double x = -875612.0014;
    String fire = "Great Fire:";
    
    System.out.printf("Roses are Red:%10b%n", r);
    System.out.printf("Answer to Question 1:%5c%n", b);
    System.out.printf("Sherlock Lived at:%3d%c%n", adrs, b);
    System.out.printf("%s %d%n", fire, date);
    System.out.printf("Usual format: %8.3f Scientific format: %8.3e%n", x, x);
  }
}

Here is the output:

Roses are Red:      true
Answer to Question 1:    B
Sherlock Lived at:221B
Great Fire: 1666
Usual format: -875612.001 Scientific format: -8.756e+05

Notes:

• If a field width is used, at least that many characters are output.
  • The field may be padded with blanks to fill it up.
• If the field width is too small, it is ignored.
• If the field width is omitted, a default value is used.
  • All the characters of a String are output.
• Integer formats don't use a precision.
• Floating point values may be formatted with f or with e.
  • Use this for float and double
• Integer values are formatted with d (for decimal format.)
  • Use this for short, int, and long

int size = 7;
System.out.printf("Perfect: %8.3f %n", size );