Analyze the following code: public class Test extends A {public static void main
ID: 3582893 • Letter: A
Question
Analyze the following code: public class Test extends A {public static void main(String[] rags) {Test t - new Test(); t.print();}} class A {String s; A{String s) {this. S = s;} public void print() {System.out.println(s);) The program does not compile because Test does not have a default constructor Test{}. The program compiles, but it has a runtime error due to the conflict on the method name print. The program has an implicit default constructor Test (), but it cannot be compiled, because its super class does not have a default constructor. The program would compile if the constructor in the class A were removed. The program would compile if a default constructor A(){} is added to class A explicitly. Composition means. that a variable of super type refers to a subtype object. that data fields should be declared private. that a class contains a data field that references another object. that a class extends another class. Suppose an ArrayList list contains ("red", "green", "red", "green"}. What is list after the following code? list.remove("red"); ("green", "red", "green"} ("green", "green") ("red", "green", "green") ("red", "green", "red", "green") You can use the operator == to check whether two variables refer to the same object, and use the equals() method to check the equality of contents of the two objects. false true an interface can be a separate unit and can be compiled into a bytecode file. false trueExplanation / Answer
question 22 :
C and D are correct options.
Justification : this is because a default constructor is required explicitly in a superclass if it has an argumented constructor.
public class Test extends A {
}
since a constructer is not provided , the default constructor will be placed. Now it is a rule that each constructor must call one of it's super class constructor. In this case the default constructor in Class Test will try to call default constructor in class A(it's parent) but as we don't have a default constructor in Class A(as we have explicitly provided a constructor with arguments in class A we will not have a default constructor in Class A ) hence we will get an error.
therefore option c is correct.
to resolve this , we can explicitly declare a parameterless (i.e. taking in no arguments) constructor in the super class A .
therefore option d is also correct.
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question 23:
option A is correct.
Justification :
Composition has its dictionary meaning as the combination of parts or elements that make up something.
Example a car has wheels, an engine, and seats. composition is a "has a " relationship between objects.
an example from oops programming would be when a class has an instance of another class inside it instead of inheriting from it.
therefore, based on this composition definition, option a is the most appropriate.
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question 24:
option A is correct
the list.remove() method is used commonly in python, and deletes the matching element of the list , and shifts the rest of the elements to their left by one.
it will delete the matching element and break i.e. if there happened to be duplicate elements in that list, list.remove() will only delete the first instance of that element and exist.
so red will be deleted as soon as the first one is encountered.
hence output would be all elements shifted to by one index minus the first red.
so A is correct.
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question 25:
A.False is correct.
vice versa is true!
== is used to check whether the contents of two obects are same or not!
whereas equals() is used to check whether two things refer to the same object!
example : if for a class person if a intialize it to 2 instances A and B, both having names John and age 20.
then , A == B will give me true , since these two objects have the same value!
but A equals B will give false, since they are distinct objects of Person!
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question 26:
this is TRUE.
Each interface is compiled into a separate bytecode file, just like a regular class.
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