в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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2010-05-31T15:28:46Z

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== %a: Floating-point hexadecimal ==



<source lang="java">
import java.util.Formatter;
public class MainClass {
public static void main(String args[]) {
Formatter fmt = new Formatter();
fmt.format("%a", 123.123);
System.out.println(fmt);
}
}</source>



<pre class=codeResult>0x1.ec7df3b645a1dp6</pre>

== Formatter with different data types ==



<source lang="java">
import java.util.Formatter;
class FormatDemo {
public static void main(String args[]) {
Formatter fmt = new Formatter();
fmt.format("Formatting %s is easy %d %f", "with Java", 10, 98.6);
System.out.println(fmt);
}
}</source>



== Formatting Output with Formatter ==



<source lang="java">
import java.util.Formatter;
public class MainClass {
public static void main(String args[]) {
Formatter fmt = new Formatter();
fmt.format("Formatting %s is easy %d %f", "with Java", 10, 98.6);

System.out.println(fmt.toString());
}
}</source>



<pre class=codeResult>Formatting with Java is easy 10 98.600000</pre>

== Hex: %x, Octal: %o: Integer hexadecimal, Octal integer ==



<source lang="java">
import java.util.Formatter;
public class MainClass {
public static void main(String args[]) {
Formatter fmt = new Formatter();
fmt.format("Hex: %x, Octal: %o", 196, 196);
System.out.println(fmt);
}
}</source>



<pre class=codeResult>Hex: c4, Octal: 304 *</pre>

== %h: Hash code of the argument ==



<source lang="java">
import java.util.Calendar;
import java.util.Formatter;
public class MainClass {
public static void main(String args[]) {
Formatter fmt = new Formatter();
Calendar cal = Calendar.getInstance();

fmt = new Formatter();
fmt.format("%h", cal);
System.out.println(fmt);
}
}</source>



<pre class=codeResult>75ed2f99</pre>

== The Format Specifiers ==

Format SpecifierConversion Applied%a and %AFloating-point hexadecimal%bBoolean%B%cCharacter%C%dDecimal integer%hHash code of the argument%H%eScientific notation%E%fDecimal floating point%gUses %e or %f, whichever is shorter%G%oOctal integer%nInserts a newline character%sString%S%tTime and date%T%xInteger hexadecimal%%Inserts a % sign

== The %g format specifier causes Formatter to use either %f or %e, whichever is shorter ==



<source lang="java">
import java.util.Formatter;
public class MainClass {
public static void main(String args[]) {
Formatter fmt = new Formatter();
for (double i = 1000; i < 1.0e+10; i *= 100) {
fmt.format("%g ", i);
System.out.println(fmt);
}
}
}</source>



<pre class=codeResult>1000.00
1000.00 100000
1000.00 100000 1.00000e+07
1000.00 100000 1.00000e+07 1.00000e+09</pre>

== The # symbol shows a digit or nothing if no digit present ==



<source lang="java">
import java.text.DecimalFormat;
import java.text.Format;
public class Main {
public static void main(String[] argv) throws Exception {
Format formatter = new DecimalFormat("##");
String s = formatter.format(-1234.567);
System.out.println(s);
s = formatter.format(0);
System.out.println(s);
}
}</source>



== Unknown Format Conversion Exception ==



<source lang="java">
import java.util.Date;
import java.util.Formatter;
public class MainClass {
public static void main(String args[]) {
Formatter fmt = new Formatter();
fmt.format("%t", new Date());
System.out.println(fmt);
}
}</source>



<pre class=codeResult>Exception in thread "main" java.util.UnknownFormatConversionException: Conversion = "t"
at java.util.Formatter$FormatSpecifier.<init>(Formatter.java:2646)
at java.util.Formatter.parse(Formatter.java:2477)
at java.util.Formatter.format(Formatter.java:2411)
at java.util.Formatter.format(Formatter.java:2364)
at MainClass.main(MainClass.java:8)</pre>

== Use Formatter to left-justify strings within a table. ==



<source lang="java">
import java.util.Formatter;
public class Main {
public static void main(String args[]) {
Formatter fmt = new Formatter();
fmt.format("%-12s %12s\n\n", "Source", "Loss");
fmt.format("%-12s %,12d\n", "Retail", 1232675);
System.out.println(fmt);
}
}
/*
Source Loss
Retail 1,232,675
*/</source>



== Use Formatter to vertically align numeric values. ==



<source lang="java">
import java.util.Formatter;
public class Main {
public static void main(String[] argv) throws Exception {
double data[] = { 12.3, 45.6, -7.89, -1.0, 1.01 };
Formatter fmt = new Formatter();
fmt.format("%12s %12s\n", "Value", "Cube Root");
for (double v : data) {
fmt.format("%12.4f %12.4f\n", v, Math.cbrt(v));
}
System.out.println(fmt);
}
}
/* Value Cube Root
12.3000 2.3084
45.6000 3.5726
-7.8900 -1.9908
-1.0000 -1.0000
1.0100 1.0033
*/</source>



== Using group separators. ==



<source lang="java">
import java.util.Formatter;
public class Main {
public static void main(String[] argv) throws Exception {
Formatter fmt = new Formatter();
fmt.format("No group separators: %d\n", 123456789);
fmt.format("With group separators: %,d\n\n", 123456789);
System.out.println(fmt);
}
}
/*No group separators: 123456789
With group separators: 123,456,789

*/</source>



== using the %t specifier with Formatter. ==



<source lang="java">
import java.util.Calendar;
import java.util.Formatter;
public class Main {
public static void main(String[] argv) throws Exception {
Formatter fmt = new Formatter();
Calendar cal = Calendar.getInstance();
// Display 12-hour time format.
fmt.format("Time using 12-hour clock: %tr\n", cal);
System.out.println(fmt);
}
}
//Time using 12-hour clock: 03:00:51 PM</source>

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