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

Method 1: Calculate using Math.round, the number format returned here is

float price=89.89;
int itemNum=3;
float totalPrice=price*itemNum;
float num=(float)(Math.round(totalPrice*100)/100);//如果要求精确4位就*10000然后/10000

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Method 2: Use DecimalFormat to return String format. This class comprehensively encapsulates decimal. Such as % sign, thousandth place, decimal precision. Scientific calculation

float price=1.2;
DecimalFormat decimalFormat=new DecimalFormat(".00");//构造方法的字符格式这里如果小数不足2位,会以0补足.
String p=decimalFomat.format(price);//format 返回的是字符串

It is recommended to use the second method to display the amount at the front desk because it returns a string format.

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