My Java Percent Grade Calculator with keyboard input from user [code and file]

[froggyboy604]

import java.util.Scanner;
import java.text.*;

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

String output;

double Percentage;
String Grade;

Scanner input = new Scanner (System.in);

System.out.print( "\nPercent Grade Calculator\n\n\nInstructions\n=============\nEnter Percent you got" +
"on a course without the percent % sign Like 80\n\nYour Percent on Assignment: ");
Percentage = input.nextDouble();



//Income Tax


if (Percentage <= 100 && Percentage >=90)
{
Grade = "A";
}
else if (Percentage >=80 && Percentage <= 89)
{
Grade = "B";
}
else if (Percentage >= 70 && Percentage <=79)
{
Grade = "C";
}
else if (Percentage >= 50 && Percentage <=69)
{
Grade = "D";
}
else if (Percentage >=0 && Percentage <=49)
{
Grade = "F";
}
else
{
Grade=" Enter percent between 0-100";
}

System.out.println(Grade);


}
}

//Just a bunch of IF Else statements and user input Keyboard scanner. Compile and run in Jgrasp or MS-Dos
//I attach the Java file to this post . Unzip to your computer or it will not work. Enter just integer numbers