import java.text.NumberFormat; 
import java.text.DecimalFormat; 
import java.util.Locale; 

/** 
* Created by IntelliJ IDEA. 
* 
* @author leizhimin 2010-3-22 19:12:33 
*/ 
public class TestNumFormat { 

        public static void 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)); 

        } 
}

234234.23 
34.23 
2.34E0004 
23423.342 
55.5244% 
13,423,423.234 
55% 

Process finished with exit code 0