Submitted by c-admin on Fri, 05/31/2019 - 05:23
Consider the following code:
class Base{
private float f = 1.0f;
void setF(float f1){ this.f = f1; }
}class Base2 extends Base{
private float f = 2.0f; //1
}
Which of the following options is a valid example of overriding?
Select 2 options
A. protected void setF(float f1){ this.f = 2*f1; }
B. public void setF(double f1){ this.f = (float) 2*f1; }
C. public void setF(float f1){ this.f = 2*f1; }
D. private void setF(float f1){ this.f = 2*f1; }
E. float setF(float f1){ this.f = 2*f1; return f;}
Submitted by c-admin on Fri, 05/31/2019 - 05:21
Consider the following classes :
class A{
public void mA(){ };
}
class B extends A {
public void mA(){ }
public void mB() { }
}class C extends B {
public void mC(){ }
}
and the following declarations:
A x = new B(); B y = new B(); B z = new C();
Which of the following calls are polymorphic calls?
Select 3 options
A. x.mA();
B. x.mB();
C. y.mA();
D. z.mC();
E. z.mB();
Submitted by c-admin on Fri, 05/31/2019 - 05:19
Which of the following is a legal return type of a method overriding the given method:
public Object myMethod() {...}
(Select the best option.)
Select 1 option
A. Object
B. String
C. Return type can be any object since all objects can be cast to Object.
D. void
E. None of the above.
Submitted by c-admin on Fri, 05/31/2019 - 05:17
Assume the following declarations:
class A{ }
class B extends A{ }
class C extends B{ }
class X{
B getB(){ return new B(); }
}
class Y extends X{ // method declaration here
}
Which of the following methods can be inserted in class Y?
Select 2 options
A. public C getB(){ return new B(); }
B. protected B getB(){ return new C(); }
C. C getB(){ return new C(); }
D. A getB(){ return new A(); }
Submitted by c-admin on Fri, 05/31/2019 - 05:08
Consider the contents of following two files:
//File A.java
package a;
public class A{
A(){ }
public void print(){ System.out.println("A"); }
} //File B.java
package b;
import a.*;
public class B extends A{
B(){ }
public void print(){ System.out.println("B"); }
public static void main(String[] args){
new B();
}
}
What will be printed when you try to compile and run class B?
Select 1 option
A. It will print A.
B. It will print B.
C. It will not compile.
D. It will compile but will not run.
E. None of the above.
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