Consider the three classes Alpha, Beta, and Gamma. Which of the following statement(s) is/are not legal in code that uses these classes (choose all that apply)? Gamma a = new Alpha(); Gamma b = new Beta(); System.out.print(a.getOne()); System.out.print(b.getThree()); System.out.print(a.getFour()); System.out.print(b.getFour()); public class Alpha extends Gamma { public String getTwo() { return("2"); } public String getTwo(int i) { return("two"); } } public class Beta extends Gamma{ public String getThree() { return ("3"); } public String getFour() { return ("four"); } } public abstract class Gamma { public String getOne() { return ("1"); } public String getFour() { return("4"); }
Consider the three classes Alpha, Beta, and Gamma. Which of the following statement(s) is/are not legal in code that uses these classes (choose all that apply)? Gamma a = new Alpha(); Gamma b = new Beta(); System.out.print(a.getOne()); System.out.print(b.getThree()); System.out.print(a.getFour()); System.out.print(b.getFour()); public class Alpha extends Gamma { public String getTwo() { return("2"); } public String getTwo(int i) { return("two"); } } public class Beta extends Gamma{ public String getThree() { return ("3"); } public String getFour() { return ("four"); } } public abstract class Gamma { public String getOne() { return ("1"); } public String getFour() { return("4"); }
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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can you give me a background explanation i can use to approach this problem?
![Consider the three classes Alpha, Beta, and Gamma.
Which of the following statement(s) is/are not legal in code
that uses these classes (choose all that apply)?
Gamma a = new Alpha();
Gamma b = new Beta();
System.out.print(a.getOne());
System.out.print(b.getThree());
System.out.print(a.getFour());
System.out.print(b.getFour());
public class Alpha extends Gamma {
public String getTwo() {
return("2");
}
public String getTwo(int i) {
return("two");
}
}
public class Beta extends Gamma{
public String getThree() {
return ("3");
}
public String getFour() {
return ("four");
}
}
public abstract class Gamma {
public String getOne() {
return ("1");
}
public String getFour() {
return("4");
}
}](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fef8944c1-efd3-4b85-a18e-90880dd3e09b%2F7980fd7e-b74c-4fea-b6af-77d70dcd32df%2Fq51j2g_processed.png&w=3840&q=75)
Transcribed Image Text:Consider the three classes Alpha, Beta, and Gamma.
Which of the following statement(s) is/are not legal in code
that uses these classes (choose all that apply)?
Gamma a = new Alpha();
Gamma b = new Beta();
System.out.print(a.getOne());
System.out.print(b.getThree());
System.out.print(a.getFour());
System.out.print(b.getFour());
public class Alpha extends Gamma {
public String getTwo() {
return("2");
}
public String getTwo(int i) {
return("two");
}
}
public class Beta extends Gamma{
public String getThree() {
return ("3");
}
public String getFour() {
return ("four");
}
}
public abstract class Gamma {
public String getOne() {
return ("1");
}
public String getFour() {
return("4");
}
}
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