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Variables inside Interface

Thillai Sakthi
Ranch Hand

Joined: Jun 17, 2000
Posts: 103
I understand that all variables (i.e. data members) inside an interface are final and static. Going by this logic, the following program should throw an error, but works perfectly! Kindly clarify why?
interface inter1
int i=10;//i is final?
void dis();
interface inter2
int i=20; /* Reinitializing i again here. Compiler is expected to throw an error.*/
class face implements inter2,inter1
public void dis()
System.out.println("Interface 1 is called");
public static void main(String ar[])
face ob=new face();


deekasha gunwant
Ranch Hand

Joined: May 06, 2000
Posts: 396
hi kumaresan,

look carefully :
1) u are initializing i two times but in two different interfaces. so being in two different interfaces they r not same. so compiler sees them as two different i's. & each of them is initialized once only. so it is perfectly okay.

2) the compiler will certainly give an error if in ur main method of face class u use any of the following statement
inter1.i = 2;
inter1.i = 4;
coz now u r trying to alter a final variable.

hope this helps
do let me know ur response
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subject: Variables inside Interface
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