Question

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; } }

1 :How many field attributes are there in the TrafficLight class?

2 :Name a field attribute for this class.

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

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

5 :What is the output type for the setStopLight method ?

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

Answer 1

Ques 1:

There are 3 attributes in the TrafficLight class.

Explanation:

First one is stopLight, Second one is waitLight and Third one is goLight.

Ques 2:

One field attribute is goLight.

Explanation:

There are a total of 3 attributes present inside the class.

One of which is named as goLight.

Ques 3:

The method which is an accessor is getGreenLight

Explanation:

getGreenLight is a method which returns the value of the variable goLight.

Ques 4:

The method which is a mutator is setStopLight

Explanation:

setStopLight is a method which can be used to set the value of the String stopLight to the passed value color.

Ques 5:

The return type of setStopLight method is void.

Explanation:

void is the return type of the setStopLight method which means that it cannot return anything.

Ques 6:

Code:

public TrafficLight()

{

stopLight = "red";

waitLight = "yellow";

goLight = "green";

}

Explanation:

Here is the constructor above which sets the value of stopLight to red, waitLight to yellow and goLight to green.

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