Explain the difference between an $"$is$-$a$"$ and "has$-$a$"$ relationship in Java.$$

public class Example $\{$ public static void main$($String$[]$ args$)\{$ double a $=1\mathrm{.}3$; double b$=2$; double total $=$ calc$($b$,$ a$)$; System.out.println$("$the total is $"+$ total$)$; $\}$ public static double calc$($double c$,$ double d$)\{$ return $($c $-$ d$)$; $\}\}$

$1.$ What are the names of the formal parameters for method calc in the above class?

$2.$ Do you find actual parameters in the method definition or method invocation?

$3.$ What is the method signature of method calc?$$

$4.$ What is the method header of method calc?

$5.$ Is the static keyword required here in the declaration of the calc method? Why or why not?

Provide an example of each concept to further demonstrate your understanding. $($no code is required for this question, but feel free to use code if it helps your explanation$)$

Answer text Question $1$

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Question $15$Answer

a$.$

private methods

b$.$

public methods

c$.$

protected methods

d$.$

a and b

e$.$

b and c

Question $14$Answer

a$.$

the parameter list and method name

b$.$

the parameter list

c$.$

the method name

d$.$

return type, method name, and parameter list

Question $13$Answer

a$.$

$$x contains a reference to a Circle object.

b$.$

$$x contains an object of the Circle type.

c$.$

You can assign an int value to x$.$

d$.$

x contains an int value.

Question $12$Answer

a$.$

that a variable of supertype can refer to a subtype object

b$.$

none of the above

c$.$

that a class can contain another class

d$.$

that data fields should be declared private

Question $11$Answer

a$.$

Raptor object can refer to a Lightning object

b$.$

FighterJet object can not refer to a Lightning object

c$.$

Lightning object can refer to a Raptor object

d$.$

FighterJet object can refer to a Raptor object

Question $10$Answer

a$.$

Subclass is more detailed than the superclass

b$.$

Superclass is more detailed than the subclass

c$.$

Subclass and superclass are only related through composition

d$.$

Both the subclass and superclass have the same level of detail