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Adicionar ArrayList noutro ArrayList


ricardoaux
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Boas

Tenho duas arraylists:

ArrayList<ArrayList<Integer>> array1 = new ArrayList<ArrayList<Integer>>();

ArrayList<Integer> array2 = new ArrayList<Integer>();

O que eu quero é adicionar elementos do array2 no array1.. faço:

array1.add(array2);

Mas está a adicionar um array vazio, em vez do conteúdo do array2 :S

Como faço para conseguir adicionar o conteúdo do array2 ao array1???

Desde já agradeço a ajuda.

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Adicionaste alguma coisa ao array2? O que estás a fazer funciona perfeitamente:

        ArrayList<ArrayList<Integer>> array1 = new ArrayList<ArrayList<Integer>>();
       ArrayList<Integer> array2 = new ArrayList<Integer>();
       ArrayList<Integer> array3 = new ArrayList<Integer>();

       array2.add(1);
       array2.add(3);

       array3.add(4);
       array3.add(6);

       array1.add(array2);
       array1.add(array3);

       for (ArrayList<Integer> a : array1) {
           System.out.println("A imprimir array:");
           for (int b : a) {
               System.out.println(b);
           }
       }

“There are two ways of constructing a software design: One way is to make it so simple that there are obviously no deficiencies, and the other way is to make it so complicated that there are no obvious deficiencies. The first method is far more difficult.”

-- Tony Hoare

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