Java's multiple methods to make double retain two decimal places. Java retains two decimal places.-javaTutorial-php.cn

Java's multiple methods to make double retain two decimal places. Java retains two decimal places.

高洛峰

Release： 2017-01-18 16:24:34

Original

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The three results of

mport java.text.DecimalFormat;  

DecimalFormat    df   = new DecimalFormat("######0.00");   

double d1 = 3.23456  
double d2 = 0.0;
double d3 = 2.0;
df.format(d1); 
df.format(d2); 
df.format(d3);

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are:

3.23
0.00 
2.00

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java retains two decimal places:

Method 1:

Rounding

double   f   =   111231.5585;  
BigDecimal   b   =   new   BigDecimal(f);  
double   f1   =   b.setScale(2,   BigDecimal.ROUND_HALF_UP).doubleValue();

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retains two decimal places Decimal

Method 2:

java.text.DecimalFormat   df   =new   java.text.DecimalFormat("#.00");  
df.format(你要格式化的数字);

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Example:

new java.text.DecimalFormat("#.00").format(3.1415926)

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#.00 means two decimal places, #.0000 means four decimal places, and so on...

Method three:

double d = 3.1415926;
String result = String .format("%.2f");

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%.2f %. Represents any number of digits before the decimal point 2 Represents two decimal places The result after the format is f Represents floating point type

Method four:

NumberFormat ddf1=NumberFormat.getNumberInstance() ;
void setMaximumFractionDigits(int digits)

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digits The number of digits displayed
Sets the maximum number of digits displayed after the decimal point for the formatted object, and the last digit displayed is rounded

import java.text.* ; 
import java.math.* ; 
class TT 
{ 
public static void main(String args[]) 
{ double x=23.5455; 
NumberFormat ddf1=NumberFormat.getNumberInstance() ;

ddf1.setMaximumFractionDigits(2); 
String s= ddf1.format(x) ; 
System.out.print(s); 
} 
}

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import java.text.*;
DecimalFormat df=new DecimalFormat(".##");
double d=1252.2563;
String st=df.format(d);
System.out.println(st);

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