Student

public class Student {
    String name;
    String group;

    Student(String name, String group){
        this.name = name;
        this.group = group;
        assignRandomExamMarkandCommentOnIt();
    }

    void assignRandomExamMarkandCommentOnIt() {
        String[] resultIs5 = {"Keep up the good work!", "You should go to MIT with results like these!",
                "I wish you were my child!", "Come here and let me give you a kiss!"};
        String[] resultIs3or4 = {"You could have done better, you know.", "I'm going to inform your parents of your performance.",
                "I am not happy with your performance.", "You should consider a career in floor sweeping."};
        String[] resultIs2 = {" Get outta here, you fuckwit!", "You should be ashamed of yourself!",
                "You deserve some corporeal punishment, go fetch the belt."};

        int rand5 = (int) (Math.random() * resultIs5.length);
        int rand3to4 = (int) (Math.random() * resultIs3or4.length);
        int rand2 = (int) (Math.random() * resultIs2.length);

        int mark = (int) (Math.random() * (4) + 2);

        System.out.print(name + ", " + "group" + group + ", your result is " + mark + ".");
        if (mark == 5) {
            System.out.println(" " + resultIs5[rand5]);
        }
        if (mark == 3 || mark == 4) {
            System.out.println(" " + resultIs3or4[rand3to4]);
        }
        if (mark == 2) {
            System.out.println(" " + resultIs2[rand2]);
        }
    }
}

_____________________

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

        System.out.println("Attention, students! Here are your exam results, listen closely.");

        Student daria = new Student("Daria Morgendorfer", " 8B");
        Student jane = new Student("Jane Lane", " 8B");
        Student trent = new Student("Trent Lane", "... what are you doing here, you're twenty five and unemployed! Anyway");

        System.out.println("Class dismissed, everybody out!");
    }
}