java - 为什么我得到 The operator - is undefined for the argument type(s) java.math.BigDecimal, java.math 错误消息

Question

Collections.sort(employees, new Comparator<Employee>() {

    public int compare(Employee s, Employee s1) {
        int comp = s.getName().compareTo(s1.getName());
        if (comp != 0) {    // names are different
            return comp;
        }
        return s.getSalary() - s1.getSalary();
    }
});
System.out.println(employees);

}

Answer 1

使用BigDecimal.compareTo(BigDecimal)它已经为你做了所有的逻辑:

return s.getSalary().compareTo(s1.getSalary());

-(减号)运算符仅为原始数字及其专用包装类型定义。