Suppose a class has public visibility. In this class we define a protected method. Which of the following statements is correct?

Declaration and Access Control
Suppose a class has public visibility. In this class we define a protected method. Which of the following statements is correct?

In a class, you cannot declare methods with a lower visibility than the visibility of the class in which it is defined.

This method is accessible from within the class itself and from within all classes defined in the same package as the class itself.

From within protected methods you do not have access to public methods.

This method is only accessible from inside the class itself and from inside all subclasses.

In a class, you cannot declare methods with a lower visibility than the visibility of the class in which it is defined.

This method is accessible from within the class itself and from within all classes defined in the same package as the class itself.

From within protected methods you do not have access to public methods.

This method is only accessible from inside the class itself and from inside all subclasses.

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Declaration and Access Control
What is the result of compiling and running the following code?public class Tester{static int x = 4;int y = 9; public Tester(){System.out.print(this.x); // line 1printVariables();}public static void printVariables(){System.out.print(x); // line 2System.out.print(y); // line 3}public static void main(String... args) { // line 4new Tester();}}

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Compile error at line 3 (static methods can't make reference to non-static variables)

Compile error at line 2 (must access x by writing Tester.x)

Compile error at line 4 (invalid argument type for method main)

Compile error at line 1 (static x must be only accessed inside static methods)

49

Compile error at line 3 (static methods can't make reference to non-static variables)

Compile error at line 2 (must access x by writing Tester.x)

Compile error at line 4 (invalid argument type for method main)

Compile error at line 1 (static x must be only accessed inside static methods)

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Declaration and Access Control
Determine output:class A{{System.out.print("b1 ");}public A(){System.out.print("b2 ");}}class B extends A{static{System.out.print("r1 ");}public B(){System.out.print("r2 ");}{System.out.print("r3 ");}static{System.out.print("r4 ");}}public class Test extends B{public static void main(String[] args){System.out.print("pre ");new Test();System.out.println("post ");}}

Compilation fail

r1 r4 pre b1 b2 r3 r2 post

r1 r4 pre b1 b2 post

r1 r4 pre b1 b2 post r3 r2

pre r1 r4 b1 b2 r2 r3 post

Compilation fail

r1 r4 pre b1 b2 r3 r2 post

r1 r4 pre b1 b2 post

r1 r4 pre b1 b2 post r3 r2

pre r1 r4 b1 b2 r2 r3 post

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Declaration and Access Control
Determine Output:class MyClass{ static final int a = 20; static final void call(){ System.out.println("two"); } static{ System.out.println("one"); }}public class Test{ public static void main(String args[]){ System.out.println(MyClass.a); }}

one 20

one two

one

one two 20

20

one 20

one two

one

one two 20

20

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Declaration and Access Control
Consider the following two classes declared and defined in two different packages, what can be added in class B to form what considered a correct access to class A from main() method of class B?package subPackage;public class A { }package anotherPackage;// line 1public class B{public static void main(String[] args){// line 2}}1. At line1 add noting; At line2 add: new A();2. At line 1 add: import package.; at line 2 add : new subPackage.A();3. At line 1 add: import subPackage.; at line 2 add : new A();4. At line 1 add: import subPackage.A; at line 2 add : new A();

1 and 3

1 and 2

2 and 4

3 and 4

1 and 3

1 and 2

2 and 4

3 and 4

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Declaration and Access Control
Choose the correct statementpublic class Circle{ private double radius; public Circle(double radius){ radius = radius; }}

The program will compile, but we cannot create an object of Circle with a specified radius. The object will always have radius 0.

The program has a compilation error because we cannot assign radius to radius.

The program has a compilation error because it does not have a main method.

The program does not compile because Circle does not have a default constructor.

The program will compile, but we cannot create an object of Circle with a specified radius. The object will always have radius 0.

The program has a compilation error because we cannot assign radius to radius.

The program has a compilation error because it does not have a main method.

The program does not compile because Circle does not have a default constructor.

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Declaration and Access Control

Declaration and Access Control Suppose a class has public visibility. In this class we define a protected method. Which of the following statements is correct?

Declaration and Access Control Determine Output:class MyClass{ static final int a = 20; static final void call(){ System.out.println("two"); } static{ System.out.println("one"); }}public class Test{ public static void main(String args[]){ System.out.println(MyClass.a); }}

Declaration and Access Control Choose the correct statementpublic class Circle{ private double radius; public Circle(double radius){ radius = radius; }}

Declaration and Access Control
Suppose a class has public visibility. In this class we define a protected method. Which of the following statements is correct?

Declaration and Access Control
Determine Output:class MyClass{ static final int a = 20; static final void call(){ System.out.println("two"); } static{ System.out.println("one"); }}public class Test{ public static void main(String args[]){ System.out.println(MyClass.a); }}

Declaration and Access Control
Choose the correct statementpublic class Circle{ private double radius; public Circle(double radius){ radius = radius; }}