Java数字的格式化

1、API层次结构： java.text.Format java.text.DateFormat java.text.SimpleDateFormat java.text.MessageFormat java.text.NumberFormat java.text.ChoiceFormat java.text.DecimalFormat 主要用到粗体显示的类。

2、例子 import java.text.NumberFormat; import java.text.DecimalFormat; import java.util.Locale; /** * Created by IntelliJ IDEA. * * @author leizhimin 2010-3-22 19:12:33 */ publicclass TestNumFormat { publicstaticvoid main(String[] args) { DecimalFormat df1 = new DecimalFormat(\"###.00\"); System.out.println(df1.format(234234.234634)); System.out.println(df1.format(34.234634)); DecimalFormat df2 = new DecimalFormat(\"0.00E0000\"); System.out.println(df2.format(23423.34234234)); DecimalFormat df3 = (DecimalFormat)NumberFormat.getInstance(Locale.CHINESE); df3.applyPattern(\"####.000\"); System.out.println(df3.format(23423.34234234)); df3.applyPattern(\"00.0000%\"); System.out.println(df3.format(0.5552445)); NumberFormat nf1 = NumberFormat.getInstance(); System.out.println(nf1.format(13423423.234234)); NumberFormat nf2 = NumberFormat.getPercentInstance(); System.out.println(nf2.format(0.55)); } }

输出结果： 234234.23 34.23 2.34E0004 23423.342 55.5244% 13,423,423.234 55% Process finished with exit code 0

如果要将带一定格式的字符串数字转化为数字类型，则值需要调用格式对象的parse()方法即可。