в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

Admin: 1 версия

2010-05-31T15:30:12Z

1 версия

Новая страница

== Displaying at most 15 characters in a string ==



<source lang="java">
import java.util.Formatter;
public class MainClass {
public static void main(String args[]) {
Formatter fmt = new Formatter();
fmt = new Formatter();
fmt.format("%.15s", "Formatting with Java is now easy.");
System.out.println(fmt);
}
}</source>



<pre class=codeResult>Formatting with</pre>

== Format to 2 decimal places in a 16-character field ==



<source lang="java">
import java.util.Formatter;
public class MainClass {
public static void main(String args[]) {
Formatter fmt = new Formatter();
fmt = new Formatter();
fmt.format("%16.2e", 123.1234567);
System.out.println(fmt);
}
}</source>



<pre class=codeResult>1.23e+02</pre>

== Limit the number of decimal digits by specifying the precision ==



<source lang="java">
import java.util.Formatter;
public class Main {
public static void main(String[] argv) throws Exception {
Formatter fmt = new Formatter();
fmt.format("Default precision: %f\n", 10.0 / 3.0);
fmt.format("Two decimal digits: %.2f\n\n", 10.0 / 3.0);
System.out.println(fmt);
}
}</source>



== Specifying a Minimum Field Width ==

An integer between the % sign and the format conversion code acts as a minimum field width specifier.
The default padding is done with spaces.
If you want to pad with 0"s, place a 0 before the field width specifier.
For example, %05d will pad a number of less than five digits with 0"s.



<source lang="java">
import java.util.Formatter;
public class MainClass {
public static void main(String args[]) {
Formatter fmt = new Formatter();
fmt.format("%05d", 88);
System.out.println(fmt);
}
}</source>



<pre class=codeResult>00088</pre>

== The minimum field width specifier by applying it to the %f conversion ==



<source lang="java">
import java.util.Formatter;
public class MainClass {
public static void main(String args[]) {
Formatter fmt = new Formatter();
fmt.format("|%f|%n|%12f|%n|%012f|", 10.12345, 10.12345, 10.12345);
System.out.println(fmt);
}
}</source>



<pre class=codeResult>|10.123450|
| 10.123450|
|00010.123450|</pre>

== To produce tables with the columns lining up ==



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

for(int i=1; i <= 10; i++) {
fmt = new Formatter();
fmt.format("%4d %4d %4d", i, i*i, i*i*i);
System.out.println(fmt);
}
}
}</source>



<pre class=codeResult>1 1 1
2 4 8
3 9 27
4 16 64
5 25 125
6 36 216
7 49 343
8 64 512
9 81 729
10 100 1000</pre>

← Предыдущая	Версия 17:44, 31 мая 2010
(нет различий)

Java Tutorial/Development/Formatter Field Width - История изменений

в 17:44, 31 мая 2010

Admin: 1 версия