Hi,

I am having trouble solving the constructor, it requires to ArrayList marks to be a deep copy of the instance variable. I have also provided the J-Unit test I have been provided.

import java.util.*;

public class GradebookEntry {

private String name;

private int id;

private ArrayList marks;

/**

* DO NOT MODIFY

*/

public String toString() {

String result = name+" (ID "+id+")\t";

for(int i=0; i < marks.size(); i++) {

/**

* display every mark rounded off to two digits.

* adding the 0.00001 to compensate for any rounding-off errors.

*/

double displayMark = (int)((marks.get(i)+0.00001)*100)/100.0;

result+=displayMark+"\t";

}

double displayTotal = (int)(getTotal()*100)/100.0;

return result.substring(0, result.length()-1)+"\t(Total "+displayTotal+") ";

}

/**

* DO NOT MODIFY

* @return name of the student

*/

public String getName() {

return name;

}

/**

* DO NOT MODIFY

* @return id

*/

public int getId() {

return id;

}

/**

* DO NOT MODIFY

* @return number of assessments

*/

public int numberOfAssessments() {

return marks.size();

}

/**

* set the instance variable id to the parameter provided.

* if i is less than 1, id should become 1.

* otherwise, id should become i.

* @param i

*/

private void setId(int i) {

if( i < 1){

id = 1;

} else {

id = i;

}

}

/**

* set instance variables name, id and marks to corresponding parameter provided.

* use the setter to set the id.

* you should make a deep copy for marks, NOT A SHALLOW COPY

* @param name

* @param id

* @param marks

*/

public GradebookEntry(String name, int id, ArrayList marks) {

this.name = name;

this.setId(id);

//Stuck on setting marks, there is no setMarks method either

}

}

This is the J-Unit Test they provided as well:

@Test

public void testGradebookEntry() {

GradebookEntry entry = new GradebookEntry("Joshua Lyman", 5, new ArrayList(Arrays.asList(1.5, 4.5, 2.5, 8.5)));

assertEquals("Joshua Lyman", entry.getName());

assertEquals(5, entry.getId());

assertEquals(4, entry.numberOfAssessments());

assertEquals(1.5, entry.getMark(0), 0.0001);

assertEquals(4.5, entry.getMark(1), 0.0001);

assertEquals(2.5, entry.getMark(2), 0.0001);

assertEquals(8.5, entry.getMark(3), 0.0001);

}