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Use the class definition below to answer the following questions. [Total 8 Marks] public class TrafficLight...

Use the class definition below to answer the following questions.

[Total 8 Marks]

public class TrafficLight {

String stopLight = "red";

String waitLight;

String goLight;

public void setStopLight(String colour) {

stopLight = colour;

}

public String getGreenLight() {

return goLight;

}

}

Question 21

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D3a - [1 Mark]

How many field attributes are there in the TrafficLight class?

Answer:

Question 22

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D3b - [1 Mark]

Name a field attribute for this class.

Answer:

Question 23

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D3c - [1 Mark]

What is the name of the method that is an accessor?

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Question 24

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D3d - [1 Mark]

What is the name of the method that is a mutator?

Answer:

Question 25

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D3e - [1 Mark]

What is the output type for the setStopLight method

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Question 26

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D3f - [3 Marks]

Write a Constructor for the TrafficLight class that sets stopLight value to “red”, waitLight to “yellow” and goLight to “green”?

Solutions

Expert Solution

Given code:

public class TrafficLight {

String stopLight = "red";

String waitLight;

String goLight;

public void setStopLight(String colour) {

stopLight = colour;

}

public String getGreenLight() {

return goLight;

}

}

.

Question 21

How many field attributes are there in the TrafficLight class?

3

  1. stopLight
  2. waitLight
  3. goLight

.

Question 22

Name a field attribute for this class.

stopLight

.

Question 23

What is the name of the method that is an accessor?

getGreenLight

Explanation:

accessor is a method which returns value of attribute of an object, here getGreenLight returns value of goLight.

.

Question 24

What is the name of the method that is a mutator?

setStopLight

Explanation:

mutator is a method which modifies value of attribute of an object, here setStopLight modifies value of stopLight.

.

Question 25

What is the output type for the setStopLight method

void

Explanation:

because setStopLight is an mutator method, it doesn't output something ie void.

.

Question 26

Write a Constructor for the TrafficLight class that sets stopLight value to “red”, waitLight to “yellow” and goLight to “green”?

TrafficLight() {

stopLight = "red";

waitLight = "yellow";

goLight = "green";

}

.

venereology answered 5 months ago
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