Change from ArrayList<String[]> to String[][] in java

Question

What's the easiest way to change ArrayList<String[]> to String[][]/Object[][] table?

I tried to use size() method, but this type of list doesn't have simple method get().

Thanks for help.

_rowTable[j][0] = new String[_listSelect.size()][columnCount];

for(int j=0; j < _listSelect.size(); j++)
 //   for(int k=0; k < columnCount; k++)
        _rowTable[j][0] = _listSelect.get(0);

How to use second loop inside properly?

Rohit Jain · Accepted Answer · 2013-08-13 11:13:29Z

12

I would use List.toArray(T[])

List<String[]> listOfStringArray = ...
String[][] arrayOfStringArray = listOfStringArray.toArray(
                                        new String[listOfStringArray.size()][]);

edited Aug 13, 2013 at 11:13

Rohit Jain

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answered Aug 13, 2013 at 10:39

Peter Lawrey

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1 Comment

criszhao Over a year ago

Cast to String[][] is redundant.

Evgeniy Dorofeev · Accepted Answer · 2013-08-13 10:42:44Z

1

try this

List<String[]> list = new ArrayList<>();
...
Object[][] objectArray = list.toArray(new Object[list.size()][]);
String[][] stringArray = list.toArray(new String[list.size()][]);

answered Aug 13, 2013 at 10:42

Evgeniy Dorofeev

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