"Java Data formatting" uses DecimalFormat to format float and double

Formatting consists of the following:

• Basic usage
• Money format;
• Scientific counting method;
• Percent counting method;
• Embed text;

  
 

   
  

  
package com.sssppp.NumberFormat;
   
  

  

   
  

  
import java.text.DecimalFormat;
   
  

  

   
  

  
public class DecimalFormatExample {
   
  

  
public static void main(String arg[]) {
   
  

  
double piD=3.1415926;
   
  

  
float piF=3.1415926f;
   
  

  

   
  

  
System.out.println("----基本用法----");
   
  

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

  
System.out.println("#.###");
   
  

  
System.out.println(formatter.format(piD));
   
  

  
System.out.println(formatter.format(piF));
   
  

  
System.out.println();
   
  

  

   
  

  
formatter.applyPattern("0.00000");
   
  

  
System.out.println("0.00000");
   
  

  
System.out.println(formatter.format(piD));
   
  

  
System.out.println(formatter.format(piF));
   
  

  
System.out.println();
   
  

  

   
  

  
//金钱格式
   
  

  
System.out.println("----金钱格式----");
   
  

  
formatter.applyPattern("#,###,###");
   
  

  
System.out.println("#,###,###");
   
  

  
System.out.println(formatter.format(1300));
   
  

  
System.out.println(formatter.format(123467898));
   
  

  
System.out.println();
   
  

  

   
  

  
formatter.applyPattern("‘$‘#,###,###");
   
  

  
System.out.println("‘$‘#,###,###");
   
  

  
System.out.println(formatter.format(1300));
   
  

  
System.out.println(formatter.format(20000));
   
  

  
System.out.println();
   
  

  

   
  

  
//科学计数法
   
  

  
System.out.println("----科学计数法----");
   
  

  
formatter.applyPattern("#.#####E0");
   
  

  
System.out.println("#.#####E0");
   
  

  
System.out.println(formatter.format(299792458));
   
  

  

   
  

  
formatter.applyPattern("00.####E0");
   
  

  
System.out.println("00.####E0");
   
  

  
System.out.println(formatter.format(299792458));
   
  

  
System.out.println();
   
  

  

   
  

  
System.out.println("----嵌入文本----");
   
  

  
formatter.applyPattern("嵌入文本：#.#####E0");
   
  

  
System.out.println("嵌入文本：#.#####E0");
   
  

  
System.out.println(formatter.format(299792458));
   
  

  
System.out.println();
   
  

  

   
  

  
System.out.println("----以百分比方式计数----");
   
  

  
formatter.applyPattern("#.##%");
   
  

  
System.out.println("#.##%");
   
  

  
System.out.println(formatter.format(0.12));
   
  

  
System.out.println();
   
  

  
}
   
  

  
}
  
 

Output Result:

  
 

   
  

  
----基本用法----
   
  

  
#.###
   
  

  
3.142
   
  

  
3.142
   
  

  

   
  

  
0.00000
   
  

  
3.14159
   
  

  
3.14159
   
  

  

   
  

  
----金钱格式----
   
  

  
#,###,###
   
  

  
1,300
   
  

  
123,467,898
   
  

  

   
  

  
‘$‘#,###,###
   
  

  
$1,300
   
  

  
$20,000
   
  

  

   
  

  
----科学计数法----
   
  

  
#.#####E0
   
  

  
2.99792E8
   
  

  
00.####E0
   
  

  
29.9792E7
   
  

  

   
  

  
----嵌入文本----
   
  

  
嵌入文本：#.#####E0
   
  

  
嵌入文本：2.99792E8
   
  

  

   
  

  
----以百分比方式计数----
   
  

  
#.##%
   
  

  
12%
  
 

From for notes (Wiz)

"Java Data formatting" uses DecimalFormat to format float and double