Trying to figure out alternative for switch using "IF, else if and else"

Create a package “com”. Create class GradeDemo with main method. Write a static method findGrade which will take percentage as input and return grade based on below criteria: Grade A : Percent >= 80 Grade B : Percent >=60 and < 80 Grade C: Percent >=40 and < 60 Grade D: Percent >=30 and < 40 Grade E : Percent < 30 For any invalid input, this method will return Grade O (letter o)"