The syntax to use the special type of for loop to process all elements of an array is ____.

	for statement (arrayName : dataType identifier)
	for (dataType identifier : arrayName) statement

	for statement (dataType identifier : arrayName)
	for (arrayName : dataType identifier) statement

The non-static methods of a class are called the ____ methods of the class.

	update
	frozen

	permanent
	instance

For reference type of variable, which statement is true about declaration of a variable and instantiation of the object?

	Declaration reserves memory location for the object and instantiation initializes the value.
	Declaration reserves variable name with its type and instantiation creates the object.

	They are the same.
	A variable has to be instantiated before your can declare it.

Which of the following is an example of a local identifier in the following code?

01: public class scopeRule 02: { 03: static double intRate = 0.055; 04: static String name; 05: static int t;

06: public static int main(String[] args) 07: { 08: int first; 09: double u, t; 10: String str; 11: //. . . 12: }

13: public static int first(int x, int y) 14: { 15: int t; 16: }

17: public static double salary; 18: }

	t (Line 15)
	intRate (Line 3)

	salary (Line 17)
	name (Line 4)

Which of the following identifiers in the following code are usable in method first?

01: public class scopeRule 02: { 03: private double intRate = 0.055; 04: private static String name; 05: private int t;

06: public static int main(String[] args) 07: { 08: int first; 09: double u, t; 10: String str; 11: //. . . 12: }

13: public static int first(int x, int y) 14: { 15: int t; 16: }

17: public double salary; 18: }

	Only salary (Line 17)
	name (Line 4)

	Both intRate (Line 3) and salary (Line 17)
	Only intRate (Line 3)

first (Line 8)

Which of the following identifiers in the following code are visible in another class?

01: public class scopeRule 02: { 03: private double intRate = 0.055; 04: private static String name; 05: private int t;

06: public static int main(String[] args) 07: { 08: int first; 09: double u, t; 10: String str; 11: //. . . 12: }

13: public static int first(int x, int y) 14: { 15: int t; 16: }

17: public double salary; 18: }

	first (Line 13)
	intRate (Line 3)

	salary (Line 17)
	Both intRate (Line 3) and salary (Line 17)

In the method first, the programmer wishes to update the value stored in the variable intRate (Line 3). Which of the following is correct?

01: public class scopeRule 02: { 03: private double intRate = 0.055; 04: private String name; 05: private static int t;

06: public static int main(String[] args) 07: { 08: int first; 09: double u, t; 10: String str; 11: //. . . 12: }

13: public static int first(int x, int y) 14: { 15: double intRate; 16: intRate = x * y; 17: }

18: public double salary; 19: }

	Write another non-static (instance) method to do so.
	Update it in the method main (Line 6)

	The code is correct. Nothing needs to be done.
	Rename the variable on Line 15 to something else.

A constructor that takes as a parameter an instance of the same class, .e.g.,

Abc x = new Abc(); // x is populated with some data Abc y = new Abc( x );

might be used for ______________?

	make an alias of the data in x
	dual-use of x and y

	Not a valid construct.
	copy the data in x to the new object

A class can only have one constructor.

	True
	False

If your class does not provide a default constructor, then your code will not execute.

	True
	False

The constructor of a class has a return type of Object.

	True
	False

The constructor of ClassA takes as a parameter an object reference of ClassB, i.e.,

public ClassA( ClassB obj ) { ... }

The programmer has written the following code in ClassB:

public ClassA someMethod() { return new ClassA( this ); }

Which of the following is true?

	The return type, ClassA is not valid in the header of someMethod.
	Cannot use the keyword 'this'

	Cannot create a new object in a return statement.
	This code is valid.

An object can exhibit polymorphism, i.e., be viewed in multiple ways. Because all object inherit (extend) from Object, a Person is an Object but ____________.

	it must provide a toString method
	an Object is not necessarily a Person.

it cannot override the toString method in Object

Consider the following class definition.

public class Cylinder extends Object { private double height;

public Cylinder (double radius, double h) { super(radius); height = h; } public double getRadius() { return super.getRadius(); }

public String toString() { return (getRadius() + " " + height); }

public double surfaceArea() { return 2 * 3.14 * getRadius() * height; }

public double volume() { return 3.14 * getRadius() * getRadius() * height; } }

Suppose that you have the following declaration.

Cylinder cyl = new Cylinder(1.5, 10);

Which of the following statements are valid in Java?

	cyl.surfaceArea();
	System.out.print(cyl.surfaceArea);

cyl.volume();