Java public class Gamma extends Beta {public void method1() {System.out.println("Gamma 1");super.method2);public class Alpha {public void method1() {System.out.println("Apublic void method3() {System.out.println("GLpha 1");amma 3");}public void method2() {System.out.println("Apublic class Beta extends Alpha {public void method2() {System.out.println("Blpha 2");}eta 2");And assuming the followingsuper.method2();}}variables have been defined:public class Delta extends Beta {public void method2() {System.out.println("DeAlpha var1 = new Gamma();new Delta();Alpha var3 = new Beta();Object var4 = new Beta();Beta var2lta 2");}Answer Inheritance Q1 - Q3below:public void method3() {method2();System.out,println("Delta 3");}} Select all correct answers (Hint: There are two)(Gamma) var2.method3() will invoke method3() from the Gamma class.O (Delta)var2.method3() will print Delta 2 and Delta 3.O (Delta)var2.method3() will cause a casting error.O (Gamma) var2.method3() will cause a casting error.

Answered: Select all correct answers (Hint: There…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Java

public class Gamma extends Be
ta {
public void method1() {
System.out.println("G
amma 1");
super.method2);
public class Alpha {
public void method1() {
System.out.println("A
public void method3() {
System.out.println("G
Lpha 1");
amma 3");
}
public void method2() {
System.out.println("A
public class Beta extends Alp
ha {
public void method2() {
System.out.println("B
lpha 2");
}
eta 2");
And assuming the following
super.method2();
}
}
variables have been defined:
public class Delta extends Be
ta {
public void method2() {
System.out.println("De
Alpha var1 = new Gamma();
new Delta();
Alpha var3 = new Beta();
Object var4 = new Beta();
Beta var2
lta 2");
}
Answer Inheritance Q1 - Q3
below:
public void method3() {
method2();
System.out,println("De
lta 3");
}
}

Select all correct answers (Hint: There are two)
(Gamma) var2.method3() will invoke method3() from the Gamma class.
O (Delta)var2.method3() will print Delta 2 and Delta 3.
O (Delta)var2.method3() will cause a casting error.
O (Gamma) var2.method3() will cause a casting error.

Expert Solution

Answer & Explanation of option 1:

Correct options are :

2 and 4

B and D.

Explanation of 1:

As Gamma extends Beta all the methods from Beta accessible to Gamma but not the same case for Beta So if we consider m3() is accessible from Beta class then It will invoke method m3() from Gamma class.

So the problem remains is about casting.

In this case we are trying to Cast Delta class to Gamma class which will give rise to Exception name as ClassCastException hence this is incorrect.

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