#119 Topic 2.3 Video 2

In the video the first attribute that is created for a lamp is

• color

• size

• isOn

• location

What is one of the behaviors for the lamp in the video?

• setBrightness

• turnOn

• setLevel

What is a NullPointerException?

• A NullPointerException is a runtime error that occurs when a program tries to access or use an object reference that has a null value.
• A NullPointerException is a compile-time error that occurs when a program tries to access or use an object reference that has a null value.
• A NullPointerException is a syntax error that occurs when a program tries to access or use an object reference that has a null value.
• A NullPointerException is a logical error that occurs when a program tries to access or use an object reference that has a null value.

What is output by the code below?      

 

public class CS

{

   public void one()

   {   

     System.out.print("go")

}

 

   public void two()

   {    

     System.out.print("back");

   }

}

//code in the main of another class

CS test = new CS();

test.one();

test.two();

• go

• back

• goback

• gobackback

• gobackgobackgo

Which of the following is a correctly written method for the class below?

public class Timer

{

private int startMin;

private int length;

public Timer(int minute, int duration)

{

startMin = minute;

length = duration;

}

public Timer(int duration)

{

startMin = 0;

length = duration;

}

}

• public void addFiveMinutes()

  {

  length = length + 5;

  }

• public addFiveMinutes()

  {

  length = length + 5;

  }

• addFiveMinutes()

  {

  length = length + 5;

  }

• public void addFiveMinutes

  {

  length = length + 5;

  }