BigDecimal 用法

import vo.Student;

import java.math.BigDecimal;


public class BigDecimalTest {
    public static void main(String[] args) {

        Student student = new Student();

        student.setAge(20);
        student.setId("1");
        student.setMath("100");
        //获取成绩
        BigDecimal bigDecimal = new BigDecimal(student.getMath());

        //起投金额
        String result = "";

        //比较成绩是否大于 60
        if (bigDecimal.compareTo(new BigDecimal(80)) >= 0){
            //保留两位小数
            String first = bigDecimal.divide(new BigDecimal(1)).setScale(2, BigDecimal.ROUND_DOWN).toString();
            result = first + " 分";
        } else {
            System.out.println("不及格");
        }
        System.out.println(result);
    }
}