Array Reference Instantiation

I am currently learning Java basic concepts and this is a very simple code which produces error depending on the way I write. It is as follows:

package testPackage;
interface ArrayInsideClassShock {
}
class Check{
ArrayInsideClassShock var[]; //Error line
var= new ArrayInsideClassShock[10];
}

Error in eclipse:Syntax error on token ";", , expected

But if I write it as:

package testPackage;
interface ArrayInsideClassShock {
}
class Check{
ArrayInsideClassShock var[]=new ArrayInsideClassShock[10];
}

It doesn't show any error.