How to retain two decimal places in java

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.

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));

Method 2: DecimalFormat’s format method

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

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);

Method 4: NumberFormat’s setMaximumFractionDigits method

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

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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