Casting Object to Array in Java [duplicate]

Question

Possible Duplicate:
How to convert object array to string array in Java

I am receiving an Object and casting it into a String array like this:

Object values[] = (Object[])request.getSession().getAttribute("userList");
String[] tmp = new String[values.length];
for(int i = 0; i < tmp.length; ++i) {
     tmp[i] = (String) values[i];
     out.println(tmp[i]);
}

Is there any better and cleaner way to do this?

when you call setAttribute() if you are passing a String[], you can just cast directly to that instead of using an object array as a proxy — Rocky Pulley
– Rocky Pulley, Commented Jan 9, 2013 at 20:09

Juvanis · Accepted Answer · 2013-01-09 20:09:19Z

7

Why not directly casting?

String values[] = (String[])request.getSession().getAttribute("userList");

answered Jan 9, 2013 at 20:09

Juvanis

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5 Comments

Richard JP Le Guen Over a year ago

Why not? Because java.lang.ClassCastException perhaps? Try String[] arr = (String[])(new Object[]{"a", "b", "c"});

Juvanis Over a year ago

@RichardJPLeGuen if getAttribute() is returning Object[] why do you still cast it to Object[] ?

Richard JP Le Guen Over a year ago

Because the return type of HttpSession.getAttribute(...) is Object not Object[].

Richard JP Le Guen Over a year ago

Of note: Object arr = (Object)(new Object[]{"a", "b", "c"}); does not throw an exception.

Juvanis Over a year ago

@RichardJPLeGuen but our concern is Object[] x = (Object[]) obj;, and your example is non-sense.

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