Need help with User defined class

Question

I need to create two Java classes. The first class will be used as a template for objects which represent students, the second will be a program which creates two student object and calls some of their methods.
Create a file called "Student.java" and in it definr a class called Student which has the following Attributes:
* a String variable which can hold the student's name
* a double variable which can hold the studnet's exam mark.
In the student class, define public methods as follows:
1 a constructor method which accepts no arguments. This method should initialise the student's name to "unknown" and set the examination mark to zero
2 A constructor method which accepts 2 arguments- the first being a string representing the student's name and the other being a double which represents their exam mark. These arguments should be used to initialise the state variables with one proviso- the exam mark must not be set to a number outside the range 0...100. If the double argument is outside this range,set the exam mark attribute to 0.
3 A reader method which returns the students name
4 A reader method which returns the students exam mark.
5 A writer method which sets the student's name
6 A writer method which sets the student's eeam mark. If the exam mark argument is outside the the 0...100 range,the exam mark attibute should not be modified.
7 A method which returns the studnet's grade. The grade is a string such as "HD" or "FL" which can be determined from the following table.
Grade Exam Mark
HD 85..100
DI 75..84
CR 65..74
PS 50..64
FL 0..49
Part2 Client Code
Write a program in a file called "TestStudent.java"
Make sure the file is in the same directory as tne "Student.java" file
In the main method of "TestStudent.java" write code to do each of the following tasks
1 Create a student object using the no argument constructor.
2 Print this student's name and their exam mark
3 Create another student object using the other constructor-supply your own name as the string argument and whatever exam mark you like as the double argument
4 Print this studnet's name and their exam mark
5 Change the exam mark of this student to 50 and print their exam mark and grade.
6 Change the examination mark of this studnet to 256 and print their exam mark and grade.
Can someone please help
goober

Answer 1

Sorry, I have sent you the wrong version. Try this,
public class Student {
     private String name;
     private double examMark;
     public Student() {
          name = "unknown";
          examMark = 0.0;
     public Student(String n, double em) {
          name = n;
          if(em >0 && em < 100) {
               examMark = em;
          } else {
               examMark = 0.0;
     public String getName() {
          return name;
     public void setName(String n) {
          name = n;
     public double getExamMark() {
          return examMark;
     public void setExamMark(double em) {
          if(em >0 && em < 100) {
               examMark = em;
          } else {
               examMark = 0.0;
     public String getGrade() {
          if ( examMark > 84) return "HD";
          else if(examMark > 74) return "DI";
          else if(examMark > 64) return "CR";
          else if(examMark > 49) return "PS";
          else return "FL";
} and
class TestStudent {
     public static void main(String a[]) {
          Student st = new Student();
          System.out.println("Student Name is : "+st.getName());
          System.out.println("Student Marks is : "+st.getExamMark());
          Student st1 = new Student("XXXX",78);
          System.out.println("Student Name is : "+st1.getName());
          System.out.println("Student Marks is : "+st1.getExamMark());
          st1.setExamMark(67);
          System.out.println("Student Marks is : "+st1.getExamMark());
          System.out.println("Student Grade is : "+st1.getGrade());
          st1.setExamMark(256);
          System.out.println("Student Marks is : "+st1.getExamMark());
          System.out.println("Student Grade is : "+st1.getGrade());
}Hope this helps.
Sudha