Person class with toJson method

gistfile1.java

public class Person {

public String toJson() {
  return "{" +
  "firstName='" + firstName + '\'' +
  ", lastName='" + lastName + '\'' +
  ", nicknames=" + Arrays.toString(nicknames) +
  '}';
}

public Person(String firstName, String lastName, String[] nicknames) {
  this.firstName = firstName;
  this.lastName = lastName;
  this.nicknames = nicknames;
}

private String firstName;
private String lastName;
private String[] nicknames;
}