Which of the following declarations are valid? class Base { ... } interface Spec

Question

Which of the following declarations are valid?

class Base
{
...
}

interface Spec
{
...
}

class Derived extends Base implements Spec
{
}

Question 15 options:

Derived object2 = new Base();

Spec object3 = new Derived();

Spec object4 = new Base();

Derived object5 = new Spec();

Which of the following expressions evaluates to false?

class C1 {}
class C2 extends C1 { }
class C3 extends C2 { }
class C4 extends C1 {}

C1 c1 = new C1();
C1 c2 = new C2();
C1 c3 = new C3();
C1 c4 = new C4();

c1 instanceof C1

c2 instanceof C1

c4 instanceof C2

c3 instanceof C1

Derived object2 = new Base();

Spec object3 = new Derived();

Spec object4 = new Base();

Derived object5 = new Spec();

Which of the following expressions evaluates to false?

class C1 {}
class C2 extends C1 { }
class C3 extends C2 { }
class C4 extends C1 {}

C1 c1 = new C1();
C1 c2 = new C2();
C1 c3 = new C3();
C1 c4 = new C4();

Question 13 options:

c1 instanceof C1

c2 instanceof C1

c4 instanceof C2

c3 instanceof C1

Explanation / Answer

C1 c4 = new C4();

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