Java Reference
In-Depth Information
public
public class
class FormatterDates
FormatterDates {
public
public static
static void
void main ( String [] args ) {
// Format number as dates e.g., 2014-06-28
System . out . printf ( "%4d-%02d-%2d%n" , 2014 , 6 , 28 );
// Format fields directly from a Date object: multiple fields from "1$"
// (hard-coded formatting for Date not advisable; see I18N chapter)
Date today = Calendar . getInstance (). getTime ();
// Might print e.g., July 4, 2015:
System . out . printf ( "Today is %1$tB %1$td, %1$tY%n" , today );
}
}
Running this FormatterDates class produces the following output:
C:> java io.FormatterDates
2014-06-28
Today is April 07, 2014
The astute reader will notice that this mechanism requires that the Java language now contain
a variable arguments mechanism. Variable argument lists have been the bane of developers
on many platforms and, indeed, they have finally come to Java. Briefly: the variable argu-
ment, which must be the last declaration in the method's header, is declared as Type . . .
name , and is treated as Type[] in the body of the method. The invocation must pass a
comma-separated list of arguments of the same or compatible types. See lang/
VarArgsDemo.java in the online source.
Scanning Input with StreamTokenizer
Problem
You need to scan a file with more fine-grained resolution than the readLine( ) method of
the BufferedReader class and its subclasses (discussed in Reading “Continued” Lines ).
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