Console Input and Output - Absolute Java - page 66

Display 2.2 The printf Method (part 2 of 2)

18 double d = 12345.123456789;

19 System.out.println("Floating-point output:");
20 System.out.println("START1234567890");
21 System.out.printf("START%fEND %n", d);
22 System.out.printf("START%.4fEND %n", d);
23 System.out.printf("START%.2fEND %n", d);
24 System.out.printf("START%12.4fEND %n", d);
25 System.out.printf("START%eEND %n", d);
26 System.out.printf("START%12.5eEND %n", d);
27 }
28 }
Sample Dialogue

String output:
START1234567890
STARTabcEND
START abcEND
STARTabcEND

The value is always output. If the specified field width
is too small, extra space is taken.

Character output:
START1234567890
STARTZEND
START ZEND

Floating-point output:
START1234567890
START12345.123457END
START12345.1235END
START12345.12END
START 12345.1235END
START1.234512e+04END
START 1.23451e+04END

Note that the output is rounded, not
truncated, when digits are discarded.

TIP: Legacy Code

Some code is so expensive to replace, it is used even if it is “old fashioned” or otherwise
less than ideal. This sort of code is called legacy code . One approach to legacy code
is to translate it into a more modern language. The Java method printf is essentially
the same as a function 1 in the C language that is also named printf . This was done
intentionally so that it would be easier to translate C code into Java code.

legacy code

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1 Methods are called functions in the C and C++ languages.