arraylist to 2d array java

Mohamed Kabha answered on August 16, 2022 Popularity 9/10 Helpfulness 3/10

answer arraylist to 2d array java

arraylist to 2d array java

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This complete mini program code answers this question in quite self-explanatory way.
Just paste and run it.


import java.util.ArrayList;
import java.util.List;

public class ListTo2Darray {

    public String[][] toArray(List<List<?>> list) {
    String[][] r = new String[list.size()][];
    int i = 0;
    for (List<?> next : list) {
       r[i++] = next.toArray(new String[next.size()]);
    }
    return r;
}

    public static void main(String[]arg){
        String[][] sham;

        List<List<?>> mList = new ArrayList();

        List<String> a= new ArrayList();
        List<String> b= new ArrayList();
        a.add("a");  a.add("a");
        b.add("b");  b.add("b");
        mList.add(a); mList.add(b); 

        ListTo2Darray mt= new ListTo2Darray();
        sham = mt.toArray(mList);

        System.out.println(sham[0][0]);
        System.out.println(sham[0][1]);
        System.out.println(sham[1][0]);
        System.out.println(sham[1][1]);
    }

}

Popularity 9/10 Helpfulness 3/10 Language java

Source: Grepper

Tags: 2d arraylist java

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Contributed on Aug 16 2022

Mohamed Kabha

0 Answers Avg Quality 2/10

arraylist to 2d array java

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