Add New Field And Call The Display Method In Main

So I have been given this code, below:

public class Person{ 
/*Complete*/
public String format(){
return String.format( "Name: %s", name );

[Code] ....

And I have been asked to add a new field called name, and call the display method in the main. I need to use an appropriate type and privacy for the name field, and once the code is finished, I should see 'Harry Potter' appear on the command line. However I don't know what it means by field. I've tried googling it and one search result said it is a field parameter, and another search result said it was something completely different, and I don't know which one it is. I've created a parameter 'Private String name;' but it only prints out 'name: null'

This is the code I wrote but it obviously doesn't work?

package Practical8;
 
public class Person{
Private String name;
public String format(){
return String.format( "Name: %s", name );

[Code] ....