How to make double type data retain two decimal places in java

Method 1: Keep two decimal places

DecimalFormat df = new DecimalFormat("#.00");   
 
double d1 = 1.23456  
double d2 = 2.0;
double d3 = 0.0;
 
System.out.println(df.format(d1),df.format(d2),df.format(d3));

Output result:

1.23  2.00  0.00

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Method 2: Keep two decimal places and round

Example 1:

public class TwoDecimal {
public static void main(String[] args) {
double f = 23.456;
BigDecimal bigDecimal = new BigDecimal(f);
//这里的 2 就是你要保留几位小数。
double f1 = bigDecimal.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
System.out.println("保留两位小数 : " + f1);
}
}

Output result:

保留两位小数 : 23.46

Example 2:

public class qq {
public static void main(String[] args) {
double i = 23.546;
NumberFormat nf = NumberFormat.getNumberInstance();
// 2是显示的小数点后的显示的最多位,显示的最后位是舍入的
nf.setMaximumFractionDigits(2);
String result = nf.format(i);
System.out.print("结果是:"+result);
}
}

Output result:

结果是 :23.55

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