arrays in java

[Prasanna Govindan]

hi java Gurus,
Please some help....

i want to create an array whose size is determined at runtime
i dont want to give the dimensions of the array at declaration.
for eg:
int [] ary;
int index=0;
ary[index]=12
gives Null pointer exception.

Is there any way to declare an array and not mention the size of it and insert values into it...faciliating the size to be determined at runtime.

Thanks
Prasanna

[Thomas Drew]

Array are not to be dynamic. You should use an ArrayList or Vectors.

[Victor Flores O'connor]

you mean like this???
'size' can be whatever you want at runtime

public class Hello
│{                
│        void Run()
│        {         
│                int [] ary;
│                int size;  
│                size = 12; 
│                ary = new int[size]; 
│                ary[size - 1] = 100; 
│                System.out.println(ary[size - 1]); 
│        }
│         
│        public static void main (String args[])
│        {                                      
│                Hello theApp = new Hello();    
│                theApp.Run();                  
│        }                                      
│}