数字格式化

import java.text.* ;
public  class NumberFormatDemo01{
   public  static  void main(String args[]){
    NumberFormat nf =  null ;     // 声明一个NumberFormat对象
    nf = NumberFormat.getInstance() ;   // 得到默认的数字格式化显示

    //NumberFormat format = NumberFormat.getInstance(Locale.CHINA);
    System.out.println( "格式化之后的数字：" + nf.format(10000000)) ;
    System.out.println( "格式化之后的数字：" + nf.format(1000.345)) ;
  }
};

import java.text.* ;
class FormatDemo{
   public  void format1(String pattern, double value){   // 此方法专门用于完成数字的格式化显示
    DecimalFormat df =  null ;       // 声明一个DecimalFormat类的对象
    df =  new DecimalFormat(pattern) ;   // 实例化对象，传入模板
    String str = df.format(value) ;     // 格式化数字
    System.out.println( "使用" + pattern
      +  "格式化数字" + value +  "：" + str) ;
  }
};
public  class NumberFormatDemo02{
   public  static  void main(String args[]){
    FormatDemo demo =  new FormatDemo() ;   // 格式化对象的类
    demo.format1( "###,###.###",111222.34567) ;
    demo.format1( "000,000.000",11222.34567) ;
    demo.format1( "###,###.###￥",111222.34567) ;
    demo.format1( "000,000.000￥",11222.34567) ;
    demo.format1( "##.###%",0.345678) ;
    demo.format1( "00.###%",0.0345678) ;
    demo.format1( "###.###\u2030",0.345678) ;
  }
};

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