input method marks java subclass

public class acceptmarks {{
    int score; // global variable
}
	public boolean valid(int marks)
{


	if (marks>=0 && marks<=100)
		return true;
	else
		return false;
	}
}
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import java.util.Scanner;
public class entermarks{
	public static void main(String[] args)
	{
	Scanner read=new Scanner(System.in);
        JavaApplication3 temp=new acceptmarks();
	int marks;
	System.out.println("Enter your score:");
	marks = read.nextInt();
	if(temp.valid(marks))
		System.out.println("Valid Score");
	else
		System.out.println("Invalid Score");
	}
}
-------------------------------------------
public class acceptmarks {
    int score; // global variable
    public boolean valid(int marks){


        if(score >= 0 && score <= 100)
            return true;
        else
            return false;
    }

    char grade;
    public char scorer(int marks){
        if(marks <=100 && marks >=90){
            grade = 'A';
        }
        else if (marks <= 89 && marks >=80){
            grade = 'B';
    }
        else if (marks <= 79 && marks >=70){
            grade = 'C';
        }
        else if (marks <= 69 && marks >= 60){
            grade = 'D';
        }
        else if (marks <60){
            grade = 'F';
        }
        else{ grade = 'n';}
        return grade;
    }
}