How to Dynamic set array??(Help)

I can't set array no values ?
exp: ......
String sttr[]=new String[];
for (int i=0;i<50;i++)
str=rd.readLine();}
this program complier error.why??

the array must have fix length. u should define like this
String array=new String[50];

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null

First of all, Thank you very much for making use of the new topic format. It is very much appreciated.
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null

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