java - `Arrays,copyOf` didn't do a deep copy of objects as it suppose to -


i have classbook can have many authors. pass few objects of class author constructor of class book copy these objects arrays.copyof if change author data outside object change everywhere means copy has not been created.

i create deep copy. code compiling , running no errors.

import java.util.arrays;  public class book {     private string tytul;     private int rokwydania;     private author[] autorzy;      public book(string tytul, int rokwydania, author... autorzy) {         this.tytul = tytul;         this.rokwydania = rokwydania;         this.autorzy = arrays.copyof(autorzy, autorzy.length);     }      public string tostring() {         string s = "      tytuł: " + tytul +"\nrok wydania: " + rokwydania + "\n";         if(autorzy.length == 1)             s+="      autor: " + autorzy[0];         else{             s+="    autorzy: " + autorzy[0];             for(int = 1; < autorzy.length; i++)                 s+="\n             " + autorzy[i];         }                return s + "\n\n";     }      public static void main(string[] args) {         author a1 = new author("isabel", "allende", 1942);         author a2 = new author("manueala", "gretkowska", 1964);         author a3 = new author("piotr", "pietucha", 1954);          book b1 = new book("suma naszych dni", 2010, a1);         book b2 = new book("polka", 2001, a2);         book b3 = new book("sceny z życia pozamałżeńskiego", 2003, a2, a3);          a2.zmieninformacje("tove", "jansson", 1956);         book b4 = new book("lato muminków", 2006, a2);          system.out.println(b1);          system.out.println(b2);          system.out.println(b3);          system.out.println(b4);     } } 
public class author {     private string imie, nazwisko;     private int rokurodzenia;      public author(string imie, string nazwisko, int rokurodzenia) {         this.imie = imie;         this.nazwisko = nazwisko;         this.rokurodzenia = rokurodzenia;     }      public string getimie() {         return imie;     }      public string getnazwisko() {         return nazwisko;     }      public int getrokurodzenia() {         return rokurodzenia;     }      @override     public string tostring() {         return  imie + " " + nazwisko + " (ur. " + rokurodzenia + ")";     }      public void zmieninformacje(string imie, string nazwisko, int rokurodzenia) {         this.imie = imie;         this.nazwisko = nazwisko;         this.rokurodzenia = rokurodzenia;      }  }

desired output:

     tytuł: suma naszych dni   rok wydania: 2010         autor: isabel allende (ur. 1942)           tytuł: polka   rok wydania: 2001         autor: manuela gretkowska (ur. 1964)           tytuł: suma naszych dni   rok wydania: 2010       autorzy: manuela gretkowska (ur. 1964)                   piotr pietucha (ur. 1954)           tytuł: lato muminków   rok wydania: 2006         autor: tove jansson (ur. 1956)

my output

      tytuł: suma naszych dni rok wydania: 2010       autor: isabel allende (ur. 1942)         tytuł: polka rok wydania: 2001       autor: tove jansson (ur. 1956)//wrong         tytuł: sceny z życia pozamałżeńskiego rok wydania: 2003     autorzy: tove jansson (ur. 1956)//wrong              piotr pietucha (ur. 1954)         tytuł: lato muminków rok wydania: 2006       autor: tove jansson (ur. 1956)

i think arrays.copyof working fine. issue in line a2.zmieninformacje("tove", "jansson", 1956); updating author a2 before printing book b2 , b3 .


Comments

Post a Comment

Popular posts from this blog

SPSS keyboard combination alters encoding -

my question not have programming practical issue on spss. accident keyword combination cannot remember because did not intend press changed encoding in spss , text in data in different language english shown small boxes. nevertheless, when kind of analysis performed different language text shown in output. does know reason? tried change encoding did not produce result. first, @ edit > options , see whether setting unicode or locale. might fix it. if have text in multiple languages, want unicode. otherwise, may have specific locale set wrong. can change set locale, need know locale want use.
Read more

Add new record to the table by click on the button in Microsoft Access -

in ms access form want implement separate button, adds new record table. in order added button , attached button event: private sub btnaddrec_click() refresh codecontextobject on error resume next docmd.gotorecord , , acnewrec if err.number <> 0 btnaddrec.enabled = false end if end end sub everything ok when open window , click btnaddrec button, problem when first of perform navigation through existed records , after click on button. got runtime error: 2105: «you can't go specified record. may @ end of recordset» . how solve issue, need have ability add new record on click on specific button, no matter, have walked or not walked through records before. thanks. i created simple form field call description (and autonumber) , created button code follows click event. filled number of records , navigated through them, clicked addnewrec button. form navigated new record without issues. able click addnewrec button directly after
Read more

CSS3 Transition to highlight new elements created in JQuery -

i want use css3 color transition apply highlight-fading color effect (yellow transparent) new elements appended markup using jquery. css #content div { background-color:transparent; -moz-transition:background-color 2s; -webkit-transition:background-color 2s; -o-transition:background-color 2s; transition:background-color 2s; } #content div.new { background-color:yellow; } html <div id="content"></div> <a id="add-element" href="#">add new element</a> js $('#add-element').click(function() { var newelement = $('<div class="new">new element</div>'); $('#content').append(newelement); newelement.removeclass('new'); }); when click link, new element created. class "new" (background color yellow) , it's appended html markup. should able remove "new" class trigger background color transition transparent (or whate
Read more