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Figure 3 - Question 3.
class java.awt.Button Button01class java.awt.Button Button02class java.awt.Label Label01class java.awt.Label Label02

Answer 3

Question 4

True or False: The code shown in Listing 4 will compile and run successfully producing the output shown in Figure 4 .

Listing 4 - Question 4.

/*File Q04.java ************************************************/import java.util.ArrayList; import java.awt.Button;import java.awt.Label; import java.awt.Component;public class Q04{ /*Given: Button and Label are subclasses of the Componentclass. The getClass method is defined in the Objectclass. When called on a reference to an object, the method returns the name of the class fromwhich the object was instantiated. */public static void main(String[] args){//Create and populate a list designed to // store references to objects of type Button// and display its contents. ArrayList<Button>listA = new ArrayList<>(); listA.add(new Button("Button01"));listA.add(new Button("Button02")); display(listA);System.out.println("");//blank line //Create and populate a list designed to// store references to objects of type Label // and display its contents.ArrayList<Label>listB = new ArrayList<>(); listB.add(new Label("Label01"));listB.add(new Label("Label02")); display(listB);}//end main //-------------------------------------------//static void display(ArrayList<Object>list){ for(Object n : list){System.out.println(n.getClass()); if(n instanceof Button){System.out.println( ((Button)n).getLabel());}else if(n instanceof Label) { System.out.println(((Label)n).getText());}//end else }//end for loop}//end display }//end class Q04
Figure 4 - Question 4.
class java.awt.Button Button01class java.awt.Button Button02class java.awt.Label Label01class java.awt.Label Label02

Answer 4

Question 5

True or False: The code shown in Listing 5 will compile and run successfully producing the output shown in Figure 5 .

Listing 5 - Question 5.

/*File Q05.java ************************************************/import java.util.ArrayList; import java.awt.Window;import java.awt.Frame; import javax.swing.JFrame;public class Q05{ /*Given: Component extends ObjectContainer extends Component Window extends ContainerFrame extends Window JFrame extends FrameThe getClass method is defined in the Object class. When called on a reference to an object,the method returns the name of the class from which the object was instantiated.*/ public static void main(String[]args){ Frame frame0 = new Frame("Frame0");ArrayList<Frame>listA = new ArrayList<>(); listA.add(frame0);listA.add(new Frame("Frame1")); display(listA);ArrayList<Window>listB = new ArrayList<>(); listB.add(new Window(frame0));listB.add(new Window(frame0)); display(listB);ArrayList<JFrame>listC = new ArrayList<>(); listC.add(new JFrame("JFrame0"));listC.add(new JFrame("JFrame1")); display(listC);}//end main //-------------------------------------------//static void display( ArrayList<? super JFrame>list){ for(Object n : list){System.out.println(n.getClass()); }//end for loopSystem.out.println();//blank line }//end display}//end class Q05

Questions & Answers

the diagram of the digestive system
Assiatu Reply
allimentary cannel
Ogenrwot
How does twins formed
William Reply
They formed in two ways first when one sperm and one egg are splited by mitosis or two sperm and two eggs join together
Oluwatobi
what is genetics
Josephine Reply
Genetics is the study of heredity
Misack
how does twins formed?
Misack
What is manual
Hassan Reply
discuss biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles
Joseph Reply
what is biology
Yousuf Reply
the study of living organisms and their interactions with one another and their environments
AI-Robot
the study of living organisms and their interactions with one another and their environment.
Wine
discuss the biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles in an essay form
Joseph Reply
what is the blood cells
Shaker Reply
list any five characteristics of the blood cells
Shaker
lack electricity and its more savely than electronic microscope because its naturally by using of light
Abdullahi Reply
advantage of electronic microscope is easily and clearly while disadvantage is dangerous because its electronic. advantage of light microscope is savely and naturally by sun while disadvantage is not easily,means its not sharp and not clear
Abdullahi
cell theory state that every organisms composed of one or more cell,cell is the basic unit of life
Abdullahi
is like gone fail us
DENG
cells is the basic structure and functions of all living things
Ramadan
What is classification
ISCONT Reply
is organisms that are similar into groups called tara
Yamosa
in what situation (s) would be the use of a scanning electron microscope be ideal and why?
Kenna Reply
A scanning electron microscope (SEM) is ideal for situations requiring high-resolution imaging of surfaces. It is commonly used in materials science, biology, and geology to examine the topography and composition of samples at a nanoscale level. SEM is particularly useful for studying fine details,
Hilary
cell is the building block of life.
Condoleezza Reply
what is cell divisoin?
Aron Reply
Diversity of living thing
ISCONT
what is cell division
Aron Reply
Cell division is the process by which a single cell divides into two or more daughter cells. It is a fundamental process in all living organisms and is essential for growth, development, and reproduction. Cell division can occur through either mitosis or meiosis.
AI-Robot
What is life?
Allison Reply
life is defined as any system capable of performing functions such as eating, metabolizing,excreting,breathing,moving,Growing,reproducing,and responding to external stimuli.
Mohamed
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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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