public class Hat { public int ID =0; public String name = "hat"; public String size = "One Size Fit All"; public String color=""; public String getName() { return name; } public void setName(String…

The correct answer is D. blackCowboyHat.setName("Cowboy Hat"). Option D is correct because setName("Cowboy Hat") is an instance method on the Hat class, and it must be called on a specific object reference - blackCowboyHat - using dot notation: blackCowboyHat.setName("Cowboy Hat"). Option A fails on two counts: Java method calls require…

Working with Methods and Encapsulation

Question

public class Hat {
public int ID =0;
public String name = "hat";
public String size = "One Size Fit All";
public String color="";
public String getName() { return name; }
public void setName(String name) {
this.name = name;
}
}
Given:
public class TestHat {
public static void main(String[] args) {
Hat blackCowboyHat = new Hat();
}
}
Which statement sets the name of the Hat instance?

Options

AblackCowboyHat.SetName = "Cowboy Hat";
BsetName("Cowboy Hat");
CHat.setName("Cowboy Hat");
DblackCowboyHat.setName("Cowboy Hat");

How the community answered

(42 responses)

A
2% (1)
B
5% (2)
C
7% (3)
D
86% (36)

Explanation

Option D is correct because setName("Cowboy Hat") is an instance method on the Hat class, and it must be called on a specific object reference - blackCowboyHat - using dot notation: blackCowboyHat.setName("Cowboy Hat").

Option A fails on two counts: Java method calls require parentheses (), and Java is case-sensitive (SetName is not the same as setName). Option B omits the object reference entirely - bare method calls like this are only valid inside the same class, not from TestHat. Option C uses the class name Hat instead of the object instance; this syntax is only valid for static methods, and setName is not static.

Memory tip: Think of it as addressing a letter - you need both the recipient (the object instance, blackCowboyHat) and the message (the method call with parentheses, .setName(...)). No recipient, no delivery.

Topics

#method invocation#instance methods#object method calls#encapsulation

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