How to retain two decimal places in java-JavaBase-php.cn

Method: 1. Use the format method, syntax "String.format("%.2f", value)"; 2. Use the format method of DecimalFormat; 3. Use the setScale method for rounding; 4. Use setMaximumFractionDigits method.

How to retain two decimal places in java

The operating environment of this tutorial: windows7 system, java10 version, DELL G3 computer.

Method 1: String’s format method (recommended)

double f = 111231.5585; System.out.println(String.format("%.2f", f));

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Method 2: DecimalFormat’s format method

double f = 111231.5585; DecimalFormat df = new DecimalFormat("#.00"); System.out.println(df.format(f));

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Method 3: BigDecimal’s setScale method

double f = 111231.5585; BigDecimal bg = new BigDecimal(f); double f1 = bg.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue(); System.out.println(f1);

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Method 4: NumberFormat’s setMaximumFractionDigits method

double f = 111231.5585; NumberFormat nf = NumberFormat.getNumberInstance(); nf.setMaximumFractionDigits(2); System.out.println(nf.format(f));

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Code:

import java.math.BigDecimal; import java.text.DecimalFormat; import java.text.NumberFormat; public class format { double f = 111231.5585; public void m1() { BigDecimal bg = new BigDecimal(f); double f1 = bg.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue(); System.out.println(f1); } /** * DecimalFormat转换最简便 */ public void m2() { DecimalFormat df = new DecimalFormat("#.00"); System.out.println(df.format(f)); } /** * String.format打印最简便 */ public void m3() { System.out.println(String.format("%.2f", f)); } public void m4() { NumberFormat nf = NumberFormat.getNumberInstance(); nf.setMaximumFractionDigits(2); System.out.println(nf.format(f)); } public static void main(String[] args) { format f = new format(); f.m1(); f.m2(); f.m3(); f.m4(); } }

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