Use fields in interface example in Java

//  Program to use field in interface.
interface AInterface
{
int  SIZE = 100;
void  showA();
}
class Test  implements  AInterface
{
public void showA()
{
 System.out.println("showA() of A interface.");
 System.out.println("SIZE = " + SIZE);
}
}
class  InterfaceTest2
{
public static void main( String args[ ] )
{
 AInterface  a1 = new Test();
 a1.showA();
}
}

Output:
showA() of A interface.
SIZE = 100