interface A {
    void a();
}
interface B {
    void b();
}
class C implements A, B  {
    public void a(){System.out.println("a");}
    public void b(){System.out.println("b");}
}
class Mixed {
    public static <T extends A & B> void foo(T arg) {
        arg.a();
        arg.b();
    }
    public static void main( String ... args ) {
        Mixed.foo( new C() );
    }

}