OnJava8-Examples/typeinfo/InterfaceViolation.java
2015-04-20 15:36:01 -07:00

24 lines
443 B
Java

//: typeinfo/InterfaceViolation.java
// Sneaking around an interface.
import typeinfo.interfacea.*;
class B implements A {
public void f() {}
public void g() {}
}
public class InterfaceViolation {
public static void main(String[] args) {
A a = new B();
a.f();
// a.g(); // Compile error
System.out.println(a.getClass().getName());
if(a instanceof B) {
B b = (B)a;
b.g();
}
}
} /* Output:
B
*///:~