Need help implementing findInstructor and addInstructor method to school class

In java

School class:

Modification 1: Add a new method called addInstructor that, if the parameter is not null, adds a copy of it to the listOfInstructors instance variable. If the parameter is null, it adds null to the

listOfInstructors instance variable.

public void addInstructor(Instructor instrObj)

{

// write implementation

}

Modification 2: Add a new method called findInstructor that returns the value returned by calling the find method on the listOfInstructors instance variable passing the instrFirst and instrLast parameters.

private Instructor findInstructor(String instrFirst, String instrLast)

{

// write implementation

}

public class Student

{

//data members of the class student

String firstName,lastName,dateOfJoining,branch;

int id;

Object object;

//default constructor

public Student()

{

}

//overloaded constructor to set the student id

public Student(int id)

{

this.id = id;

}

//overloaded constructor to initialize data members of the class

public Student(String fName,String lName, int sId, String doj, String branch, Object object)

{

firstName=fName;

lastName=lName;

dateOfJoining=doj;

branch=branch;

id=sId;

this.object=object;

}

//method to return the object into readable format

@Override

public String toString()

{

return "Student [firstName=" + firstName + ", lastName=" + lastName + ", dateOfJoining=" + dateOfJoining

+ ", branch=" + branch + ", id=" + id + ", object=" + object + "]";

}

}

Create class clalled DualEnrolledStudent.

DualEnrolledStudent.java source code:

//inheritance

public class DualEnrolledStudent extends Student

{

//data members of the class student

String fname,lname,doj,decision,schoolname;

int cid;

Object ob;

//default constructor

DualEnrolledStudent()

{

}

//overloaded constructor to initialize data members of the class

public DualEnrolledStudent(String fname, String lname, int id, String doj, String decision, Object ob,

String schoolname, int cid)

{

//calls the Student class constructor and sets the student id

super(id);

this.fname=fname;

this.lname=lname;

this.doj=doj;

this.decision=decision;

this.schoolname=schoolname;

this.ob=ob;

this.cid=cid;

}

//method to return the object into readable format

@Override

public String toString()

{

return "DualEnrolledStudent [fname=" + fname + ", lname=" + lname + ", id=" + id + ", decision=" + decision

+ ", schoolname=" + schoolname + ", doj=" + doj + ", cid=" + cid + ", ob=" + ob + "]";

}

}

Create class clalled TransientStudent.

TransientStudent.java source code:

//inheritance

public class TransientStudent extends Student

{

String fname,lname,doj,branch,schoolname;

Object ob;

//default constructor

TransientStudent()

{

}

//overloaded constructor to initialize data members of the class

public TransientStudent(String fname, String lname, int id, String doj, String branch, Object ob,

String schoolname)

{

//calls the Student class constructor and sets the student id

super(id);

this.fname=fname;

this.lname=lname;

this.doj=doj;

this.branch= branch;

this.schoolname=schoolname;

this.ob=ob;

}

//method to return the object into readable format

@Override

public String toString()

{

return "TransientStudent [fname=" + fname + ", lname=" + lname + ", doj=" + doj + ", branch=" + branch

+ ", schoolname=" + schoolname + ", id=" + id + ", ob=" + ob + "]";

}

}