Admin: 1 версия

2010-06-01T06:17:43Z

1 версия

в 18:01, 31 мая 2010

2010-05-31T18:01:44Z

Новая страница

== Change the decimal separator is set to "." ==



<source lang="java">

import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
public class Main {
public static void main(String args[]) {
double d = 123456.7890;
DecimalFormat df = new DecimalFormat("#####0.00");
DecimalFormatSymbols dfs = df.getDecimalFormatSymbols();
dfs.setDecimalSeparator(".");
df.setDecimalFormatSymbols(dfs);
System.out.println(df.format(d));
}
}

</source>



== Convert a number using the current Locale() ==



<source lang="java">

import java.text.NumberFormat;
import java.util.Locale;
public class Main {
public static void main(String[] args) throws Exception {
System.out.println(NumberFormat.getInstance(new Locale("us")).format(12345.12345));
}
}
//12,345.123

</source>



== DecimalFormat("0000000000E0") ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String[] argv) throws Exception {
DecimalFormat formatter = new DecimalFormat("0000000000E0");
String s = formatter.format(-1234.567); // -1234567000E-6
System.out.println(s);
}
}

</source>



== DecimalFormat("00.00E0") ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String[] argv) throws Exception {
DecimalFormat formatter = new DecimalFormat("00.00E0");
String s = formatter.format(-1234.567); // -12.35E2
System.out.println(s);
s = formatter.format(-.1234567); // -12.35E-2
System.out.println(s);
}
}

</source>



== DecimalFormat("000E00") ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String[] argv) throws Exception {
DecimalFormat formatter = new DecimalFormat("000E00");
String s = formatter.format(-1234.567); // -123E01
System.out.println(s);
}
}

</source>



== DecimalFormat("00E00") ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String[] argv) throws Exception {
DecimalFormat formatter = new DecimalFormat("00E00");
String s = formatter.format(-1234.567);
System.out.println(s);
}
}
// -12E02

</source>



== DecimalFormat("##E0") (exponent must be multiple of 2) ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String[] argv) throws Exception {
DecimalFormat formatter = new DecimalFormat("##E0");
String s = formatter.format(-1234.567);
System.out.println(s);
s = formatter.format(-123.4567);
System.out.println(s);
s = formatter.format(-12.34567);
System.out.println(s);
}
}
// -12E2
// -1.2E2
// -12E0

</source>



== DecimalFormat("###E0") (exponent must be multiple of 3) ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String[] argv) {
DecimalFormat formatter = new DecimalFormat("###E0");
String s = formatter.format(-1234.567); // -1.23E3
System.out.println(s);
s = formatter.format(-123.4567); // -123E0
System.out.println(s);
s = formatter.format(-12.34567); // -12.3E0
System.out.println(s);
s = formatter.format(-1.234567); // -12.3E0
System.out.println(s);
s = formatter.format(-.1234567); // -123E-3
System.out.println(s);
}
}

</source>



== Display a currency value ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String[] argv) throws Exception {
DecimalFormat df = new DecimalFormat("\u00a4#,##0.00");
System.out.println(df.format(4232.19));
System.out.println(df.format(-4232.19));
}
}

</source>



== Display a percentage ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String[] argv) throws Exception {
DecimalFormat df = new DecimalFormat("#%");
System.out.println(df.format(0.19));
System.out.println(df.format(-0.19));
}
}
/*19%
-19%
*/

</source>



== Display numbers with commas ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String args[]) {
double d = 123456.7890;
DecimalFormat df = new DecimalFormat("#####0.00");
System.out.println(df.format(d));
}
}
//123456.79

</source>



== Display numbers with leading zeroes ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String args[]) {
DecimalFormat df = new DecimalFormat("0000000000000000");
String z = df.format(123456);
System.out.println(z);
}
}

</source>



== Display the amount of free memory in the Java Virtual Machine. ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String[] args) {
DecimalFormat df = new DecimalFormat("0.00");
long freeMem = Runtime.getRuntime().freeMemory();
System.out.println(df.format(freeMem / 1000000F) + " MB");
}
}

</source>



== Display the maximum amount of memory ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String[] args) {
DecimalFormat df = new DecimalFormat("0.00");
long maxMem = Runtime.getRuntime().maxMemory();
System.out.println(df.format(maxMem / 1000000F) + " MB");
}
}

</source>



== Display the total amount of memory in the Java virtual machine. ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String[] args) {
DecimalFormat df = new DecimalFormat("0.00");
long totalMem = Runtime.getRuntime().totalMemory();
System.out.println(df.format(totalMem / 1000000F) + " MB");
}
}

</source>



== Force minimum number of digits to left and right of decimal point ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String[] argv) throws Exception {
DecimalFormat formatter = new DecimalFormat("0.0E0");
String s = formatter.format(-1234.567); // -1.2E3
System.out.println(s);
}
}

</source>



== new DecimalFormat("#.#") ==



<source lang="java">

import java.text.DecimalFormat;
import java.text.NumberFormat;
public class Main {
public static void main(String[] argv) throws Exception {
NumberFormat formatter = new DecimalFormat("#.#");
String s = formatter.format(-1234.567); // -1234.6
System.out.println(s);
}
}

</source>



== new DecimalFormat("##00") ==



<source lang="java">

import java.text.DecimalFormat;
import java.text.NumberFormat;
public class Main {
public static void main(String[] argv) throws Exception {
NumberFormat formatter = new DecimalFormat("##00");
String s = formatter.format(0); // 00
System.out.println(s);
}
}

</source>



== new DecimalFormat("0.00") ==



<source lang="java">

import java.text.DecimalFormat;
import java.text.NumberFormat;
public class Main {
public static void main(String[] argv) throws Exception {
NumberFormat formatter = new DecimalFormat("0.00");
String s = formatter.format(-.567); // -0.57
System.out.println(s);
}
}

</source>



== new DecimalFormat("#.000000") ==



<source lang="java">

import java.text.DecimalFormat;
import java.text.NumberFormat;
public class Main {
public static void main(String[] argv) throws Exception {
NumberFormat formatter = new DecimalFormat("#.000000");
String s = formatter.format(-1234.567);
System.out.println(s);
}
}
//-1234.567000

</source>



== new DecimalFormat("000000E0") ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String args[]) {
System.out.println(new DecimalFormat("000000E0").format(123123));
}
}
//123123E0

</source>



== new DecimalFormat("0.######E0") ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String args[]) {
System.out.println(new DecimalFormat("0.######E0").format(12345));
}
}
//1.2345E4

</source>



== new DecimalFormat("#.######") (1) ==



<source lang="java">

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

</source>



== new DecimalFormat(".######") (2) ==



<source lang="java">

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

</source>



== new DecimalFormat(abc#) ==



<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(""abc"#");
String s = formatter.format(-1234.567);
System.out.println(s);
}
}
// -abc1235

</source>



== new DecimalFormat("#,###,###") (grouping) ==



<source lang="java">

import java.text.DecimalFormat;
import java.text.NumberFormat;
public class Main {
public static void main(String[] argv) throws Exception {
NumberFormat formatter = new DecimalFormat("#,###,###");
String s = formatter.format(-1234.567);
System.out.println(s);
s = formatter.format(-1234567.890);
System.out.println(s);
}
}
// -1,235
// -1,234,568

</source>



== Round number to fewer decimals ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String[] args) {
double numberToRound = 12345.6789;
DecimalFormat df = new DecimalFormat("0.000");
System.out.println("Rounded number = " + df.format(numberToRound));
System.out.println(String.format("Rounded number = %.3f", numberToRound));
}
}
/*
Rounded number = 12345.679
Rounded number = 12345.679
*/

</source>



== Set format to two decimal places: set Maximum Fraction Digits ==



<source lang="java">

import java.text.NumberFormat;
public class Main {
public static void main(String args[]) {
NumberFormat nf = NumberFormat.getInstance();
System.out.println("Default format: " + nf.format(1234567.678));
nf.setMaximumFractionDigits(2);
System.out.println("Format with two decimal places: " + nf.format(1234567.678));
}
}
/*
Default format: 1,234,567.678
Format with two decimal places: 1,234,567.68
*/

</source>



== Set format to two decimal places: set Minimum Fraction Digits ==



<source lang="java">

import java.text.NumberFormat;
public class Main {
public static void main(String[] argv) throws Exception {
NumberFormat nf = NumberFormat.getInstance();
nf.setMinimumFractionDigits(2);
System.out.println("Format with two decimal places: " + nf.format(1234567.678));
}
}

</source>



== The 0 symbol shows a digit or 0 if no digit present ==



<source lang="java">

import java.text.DecimalFormat;
import java.text.NumberFormat;
public class Main {
public static void main(String[] argv) throws Exception {
NumberFormat formatter = new DecimalFormat("000000");
String s = formatter.format(-1234.567);
System.out.println(s);
// number was rounded up
}
}
//-001235

</source>



== The number of #"s to the left of the decimal point sets the multiple of the exponent. ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String[] argv) throws Exception {
DecimalFormat formatter = new DecimalFormat("#E0"); // exponent can be any
// value
String s = formatter.format(-1234.567);
System.out.println(s);

s = formatter.format(-.1234567);
System.out.println(s);
}
}
//-.1E4
//-.1E0

</source>



== The . symbol indicates the decimal point ==



<source lang="java">

import java.text.DecimalFormat;
import java.text.NumberFormat;
public class Main {
public static void main(String[] argv) throws Exception {
NumberFormat formatter = new DecimalFormat(".00");
String s = formatter.format(-.567); // -.57
System.out.println(s);
}
}

</source>



== The , symbol is used to group numbers ==



<source lang="java">

import java.text.DecimalFormat;
import java.text.NumberFormat;
public class Main {
public static void main(String[] argv) throws Exception {
NumberFormat formatter = new DecimalFormat("#,###,###");
String s = formatter.format(-1234.567);
System.out.println(s);
s = formatter.format(-1234567.890);
System.out.println(s);
}
}
// -1,235
// -1,234,568

</source>



== The " symbol is used to quote literal symbols ==



<source lang="java">

import java.text.DecimalFormat;
import java.text.NumberFormat;
public class Main {
public static void main(String[] argv) throws Exception {
NumberFormat formatter = new DecimalFormat(""#"#");
String s = formatter.format(-1234.567);
System.out.println(s);
}
}
//-#1235

</source>



== The ; symbol is used to specify an alternate pattern for negative values ==



<source lang="java">

public class Main{
public static void main(String[] argv) throws Exception{
NumberFormat formatter = new DecimalFormat("#;(#)");
String s = formatter.format(-1234.567); // (1235)
sysout
}}

</source>



== Use group separators and show trailing zeroes ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String[] argv) throws Exception {
DecimalFormat df = new DecimalFormat("#,.00;(#,.00)");
System.out.println(df.format(7123.00));
}
}

</source>



== Use java.text.DecimalFormat to format integer ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String args[]) {
System.out.println(new DecimalFormat("0.#####E0").format(123456));
}
}
//1.23456E5

</source>



== Use new DecimalFormat("0.#####E0") to format double ==



<source lang="java">

import java.text.DecimalFormat;
public class Main {
public static void main(String args[]) {
double d = 0.12345;
System.out.println(new DecimalFormat("0.#####E0").format(d));
}
}
//1.2345E-1

</source>

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Admin: 1 версия

в 18:01, 31 мая 2010