Those are JAVA OOP questions, Please help 1. Which of the following statements i

Question

Those are JAVA OOP questions, Please help

1.

Which of the following statements is true?

A static variable cannot have its value set in a constructor

A static variable must be declared final

An instance variable can't be declared final

A static method can't access an instance variable

Only a static method can access a static variable

2.

Which statements are most accurate regarding the following classes?

class C {
private int s;
protected int t;
}

class D extends C {
private int x;
protected int y;

// some methods omitted
}

In the class D, an instance method can only access x, y.

In the class D, an instance method can only access t, y.

In the class D, an instance method can only access t, x, y.

In the class D, an instance method can access s, t, x, y.

3.

Which of the following prototypes shows that a Cube subclass is derived from a superclass called Square?

class Square extends Cube

class Cube derived Square

class Cube extends Square

class Square derived Cube

4.

Analyze the following code:

public class SampleApp {
public static void main(String[] args) {
String s = new String("Hello World!");
Object o = s;
String d = (String)o;
}
}

Which of the following is true?

When assigning s to o in Object o = s, a new object is created.

When casting o to s in String d = (String)o, a new object is created.

When casting o to s in String d = (String)o, the contents of o is changed.

s, o, and d reference the same String object.

5.

Which of the following always needs to start with a Capital letter?

class names

objects and class names

fields

data types and fields

6.

If classes Student, Staff and Faculty extend class Person, which one makes sense:

Faculty[] faculties={new Person(), new Staff(), new Student()};

Staff[] staff={new Person(), new Faculty(), new Student()};

Person[] persons={new Faculty(), new Staff(), new Student()};

7.

If none of the private/protected/public is specified for a member, that member ...

is accessible publicly

is only accessible by other classes of the same package

is only accessible from within the class

is accessible by the class and its subclasses

A static variable cannot have its value set in a constructor

A static variable must be declared final

An instance variable can't be declared final

A static method can't access an instance variable

Only a static method can access a static variable

Explanation / Answer

1) A

2) C

3) C

4) A

5) A

6) C

7) A

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