Here you go. I added a constructor and a toString overload to make the object creation and printing as easy as possible.
public class student {
  private String _id;
  private String _name;
  private String _address;
  public student(String id, String name, String address) {
    _id = id;
    _name = name;
    _address = address;
  }
  public String toString() {
    return "Id: " + _id + "\nName: " + _name + "\nAddress: "+ _address;
  }
  public static void main(String[] args) {
    student s1 = new student("S12345", "John Doe", "Some street");
    System.out.println(s1);
  }
}
