bookTest.java prints out author arrayList, but not isbn -

requirements: accommodate multiple authors using 1 of components java collection framework. requires 1 book isbn , collection of authors. junit: guidance testvalidate: test @ least 2 cases (one case book properties hold correct data types , not empty nor hold null value, 1 not). guidance testequals: test @ least 2 cases (one case authors , isbn match, 1 not). test @ least 2 authors. teacher told me: testequals need add isbn , 2 authors. create arraylist. add 2 authors it. create book object , add arraylist instance , isbn. think that's have done, authors printing, isbns not. total newbie , @ loss! can help?

edit/addition got isbn print, printing second isbn have. need change both of them print? or matter?

here output:

testsuite: library.domain.booktest equals author list: [bob smith, jane doe] isbn: 67890 validate author list: [bob smith, jane doe] isbn: 67890 tests run: 2, failures: 0, errors: 0, skipped: 0, time elapsed: 0.23 sec  ------------- standard output --------------- equals author list: [bob smith, jane doe] isbn: 67890 validate author list: [bob smith, jane doe] isbn: 67890 ------------- ---------------- --------------- test: deleting: /var/folders/k7/wpgy3lw91171qxlzt4pj0cfh0000gn/t/test-library.domain.booktest.xml build successful (total time: 1 second) 

here new page:

new booktest.java

package library.domain;  import java.util.arraylist; import static org.junit.assert.assertequals; import org.junit.test;  public class booktest {      private arraylist<string> authorlist = new arraylist<>();      @test     public void testequals()                //test equals() accuracy     {         system.out.println("equals");         authorlist.add("bob smith");         book book = new book("12345", authorlist);         assertequals("expected true", true, book.equals(book));         authorlist.add("jane doe");         book = new book("67890", authorlist);         assertequals("expected true", true, book.equals(book));         system.out.println("author list: " + authorlist);         system.out.println("isbn: " + book.getisbn());     }      @test     public void testvalidate()          //test validate() accuracy     {         system.out.println("validate");         authorlist.add("bob smith");         book book = new book("12345", authorlist);         assertequals("expected true", true, book.validate());         authorlist.add("jane doe");         book = new book("67890", authorlist);         assertequals("expected true", true, book.validate());         system.out.println("author list: " + authorlist);         system.out.println("isbn: " + book.getisbn());     } } 

book.java

package library.domain;  import java.util.arraylist; import java.util.objects;  public class book {      private string isbn;     private arraylist<string> authorlist;      public book(string isbn, arraylist<string> authorlist)     {         this.isbn = isbn;         this.authorlist = authorlist;     }      public string getisbn()             //access isbn , manages  next value     {         return isbn;     }      public void setisbn(string isbn)            //assigns input isbn data member isbn     {         this.isbn = isbn;     } //assigns input author data member author      public arraylist<string> getauthorlist()     {         return authorlist;     }      public void setauthorlist(arraylist<string> authorlist)     {         this.authorlist = authorlist;     }      @override     public boolean equals(object obj)           //checks  equality of 2 objects - true if same, false if different     {         if (this == obj) {             return true;         }         if (!(obj instanceof book)) {             return false;         }          book book = (book) obj;         if (!this.isbn.equals(book.isbn)) {             return false;         }         if (!this.authorlist.equals(book.authorlist)) {             return false;         }         return true;     }      @override     public int hashcode()           //override hash     {         int hash = 7;         hash = 97 * hash + objects.hashcode(this.authorlist);         hash = 97 * hash + objects.hashcode(this.isbn);         return hash;     }      public boolean validate()           //validate isbn , author not null     {         if (isbn == null || isbn.equals("")) {             return false;         }         if (authorlist == null || authorlist.equals("")) {             return false;         }         {             return true;         }     } } 

booktest.java

package library.domain;  import java.util.arraylist; import static org.junit.assert.assertequals; import org.junit.test;  public class booktest {      private arraylist<string> authorlist = new arraylist<>();     private string isbn;      @test     public void testequals()                //test equals() accuracy     {         system.out.println("equals");         authorlist.add("bob smith");         authorlist.add("jane doe");         book book = new book("12345", authorlist);         assertequals("expected true", true, book.equals(book));         system.out.println("author list: " + authorlist);         system.out.println("isbn: " + isbn);     }      @test     public void testvalidate()          //test validate() accuracy     {         system.out.println("validate");         authorlist.add("bob smith");         authorlist.add("jane doe");         book book = new book("12345", authorlist);         assertequals("expected true", true, book.validate());         system.out.println("author list: " + authorlist);         system.out.println("isbn: " + isbn);     } } 

isbn in test class local variable , not setting values same. check if object being created correctly, try printing book.getauthorlist() , book.getisbn()