"Student.java": Error #: 200 : ')' expected at line 7, column 24

Question

Hi all, i am getting an error message 200 while trying to compile the program below. Please can someone help me to point out my mistake please?
public class Student extends Thread {
private int id;           // student id; can take the values 1 or 2
private Unit unit;           // the Unit they are studying
// code for two-argument constructor
public Student(int id 1, int id 2){
    int id 1=student 1;
    int id 2=student 2;
public void run() {
    for (int session = 1; session < 4; session++) {
      unit.revise(id,session);
      System.out.println("Student " + id + " has TV break number " + session);
      try {
        Thread.sleep(5);
        }catch (InterruptedException e) {}
  public static void main(String[] args) {
    Unit courseUnit = new Unit();
    // code to create and start two threads (the students)
    Student1=new Student;
    Student2=new Student;

Answer 1

Thanks for your help. I have to confess that i thought that programming in java language was easy, now i know better. I am still getting the error messages. I have included the Unit code and Student code. I hope i will succeed in overcoming this first major battle.
public class Unit {
  public void revise(int id, int session) {
    System.out.println("Student " + id + " starts revision session " + session);
    try{
      Thread.sleep(5*id);
      }catch(InterruptedException e){}
    System.out.println("Student " + id + " stops revision session " + session);
  private int id;           // student id; can take the values 1 or 2
private Unit unit;           // the Unit they are studying
// code for two-argument constructor
    Student id1=student1;
    Student id2=student2;
public void run() {
    for (int session = 1; session < 4; session++) {
      unit.revise(id,session);
      System.out.println("Student " + id + " has TV break number " + session);
      try {
        Thread.sleep(5);
        }catch (InterruptedException e) {}
  public static void main(String[] args) {
    Unit courseUnit = new Unit();
    // code to create and start two threads (the students)
    Student student1 = new Student();
    Student student2 = new Student();
The error messages are:
"Student.java": Error #: 300 : variable student1 not found in class Student at line 7, column 17
"Student.java": Error #: 300 : variable student2 not found in class Student at line 8, column 17
Thanks for your help as i look forward to picking up from your(and others) candid advise