Java and plz use studentlist and code tester thank you!

public interface StudentList { /* * Purpose: adds Student s to back of this list * Parameters: Student - s * Returns: nothing */ public void add(Student s); /* * Purpose: returns the number of elements in this list * Parameters: none * Returns: int - the number of elements */ public int size(); /* * Purpose: returns a String reprensentation of the elements * in this list separated by newlines * Parameters: none * Returns: String - the representation */ public String toString(); /* * Purpose: removes the first element in the list * Parameters: none * Returns: nothing */ public void removeFront(); /* * Purpose: determines whether a Student which is equivalent to s * is contained in this list * Parameters: Student - s * Returns: boolean - true if a Student matching s is found, * false otherwise */ public boolean contains(Student s); } public static void testNode() { Student s0 = new Student("abc", 50); Student s1 = new Student("def", 56); Student s2 = new Student("xyz", 99); Student s2b = new Student("xyz", 29); StudentNode n0 = new StudentNode(s0); // must use == to determine whether they are the SAME object, // .equals will tell us if they are equivalent sIDs displayResults(n0.getData() == s0, "test contructor 1 arg with getData"); displayResults(n0.getNext() == null, "test contructor 1 arg with getNext"); StudentNode n1 = new StudentNode(s1, n0); displayResults(n1.getData() == s1, "test contructor 2 args with getData"); displayResults(n1.getNext() == n0, "test contructor 2 args with getNext"); StudentNode n2 = new StudentNode(s2, n1); displayResults(n2.getData() == s2, "test contructor 2 args with getData"); displayResults(n2.getNext() == n1, "test contructor 2 args with getNext"); displayResults(n2.getNext().getNext() == n0, "test contructor 2 args with getNext"); n2.setData(s2b); displayResults(n2.getData() == s2b, "test setData with getData"); n2.setData(s1); displayResults(n2.getData() == s1, "test setData with getData"); n2.setNext(n0); displayResults(n2.getNext() == n0, "test setNext with getNext"); displayResults(n2.getNext().getNext() == null, "test setNext with getNext"); }

* Purpose: returns the number of elements in this list * Parameters: none * Returns: int - the number of elements */ public int size(); * Purpose: returns the number of elements in this list * Parameters: none * Returns: int - the number of elements */ public int size()