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Inner Classes (2)

 
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class AB{
//1
public static void main(String ar[]){
//2
class A{
//3
public String name;
//4
public A(String s){
//5
name = s;
//6
}
//7
}
//8
Object obj = new A("XYZ"); whats happening here
//9
A h =(A) obj; here
//10
System.out.println(h.name);
//11
}
//12
}
//13

whats happening at line 9 and line 10
[ October 13, 2007: Message edited by: Burkhard Hassel ]
 
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Originally posted by Hasitha Randika:
...whats happening at line 9 and line 10


In line 9, a new instance of A is created, and a reference to this instance is assigned to the variable "obj" which has a type of Object. This is an "assignment conversion," in which the reference type is implicitly upcast from type A to type Object.

In line 10, the reference held by "obj" is explicitly downcast from type Object to type A (the true runtime type of the instance), and assigned to the variable "h" which has a type of A.
[ October 13, 2007: Message edited by: marc weber ]
 
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