java - Trying to add Array of Strings via Another Class using HashMap -

basically know how arraylist array i'm totally stumped.

import java.util.hashmap; import java.util.set; import java.util.iterator; import java.util.map; import java.util.collection;  public class nobelprizewinners {     private hashmap<string, prizewinners[]> winners;      public nobelprizewinners()     {         winners = new hashmap<string, prizewinners[]>();          prizewinners[] name = new prizewinners[3];         name[0] = new prizewinners("hey" , "hey");          winners.put("2008", name);     } } public void displayallyearsandwinners(){     set<string> years = winners.keyset();              for(string year : years){                 prizewinners [] list = winners.get(year);                 for(prizewinners[] names : list){                 system.out.println(year + " " +   names);              }           }     } 

this returns memory address not actual strings (the prizewinners class has 2 string parameters in constructor, 2 set methods first , last name)

i feel i'm pretty close returns "2008" 3 times memory address or null other 3 times (as haven't added other 2 arrays yet still testing see if works)

any appreciated, feel name or method need call i'm not sure on.

the first issue loop should following:

for (string year: years) {     prizewinners[] list = winners.get(year);     (prizewinners names: list) {         system.out.println(year + " " + names);     } } 

because retrieve list array, for-each loop returns prizewinners each iteration, not another array.

this line:

system.out.println(year + " " +   names);  

is equivalent following:

system.out.println(year.tostring() + " " +   names.tostring());  

since year string, tostring() method returns value, expected.

but names array. tostring() method directly inherited object , prints memory address of names.

the cleanest way solve override tostring() in class prizewinners. lets decide string representation of class should be.

public string tostring() {     return this.firstname + ", " + this.lastname; } 

now, when implicit tostring() called on names instance of prizewinners, you'll expected output.