Java float retains two decimal places or decimal places

Method 1: Use Math.Round to calculate the number format that is returned here.

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

Method 2: Return with DecimalFormat in string format. The class is fully encapsulated in decimal. Like the% number, thousand bits, 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

Java float retains two decimal places or decimal places