Question

What causes an assertion error in JAVA on this?

Code:

public class Student extends Staff {

       private String s1;

       private String s2;

       public Student (String firstName, String lastName, String s1, String s2) {

             this.s1 = s1;

             this.s2 = s2;

       }

       public boolean equals(Person s){

             if (s == null) return false;            

             return ((this.s1).equals(this.s2));

       }

}

Test Case:

       public void areTheyEqualTest() {

             Student             s1     = new Student( FIRST_NAME, LAST_NAME);

             Student             s2 = new Student( FIRST_NAME, LAST_NAME);

             assertTrue( s1.equals( s2) );

       }

Answer 1

Because there is no constructor with 2 string parameters 
 
Replace the line
public Student (String firstName, String lastName, String s1, String s2) {
with
public Student (String s1, String s2) {

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