Allow the user to enter up to 20 student names and for each

Allow the user to enter up to 20 student names, and for each student 3 quiz scores (in the range 0-100). Once input is done, display each student’s name, their three quiz scores, and their quiz score average, one student per line. The output table does not need to line up perfectly in columns. Use dialog boxes for all input and output. Use 5 arrays, one for the names, 3 for the scores, and one for the average. Write a method that takes three values and returns their average, and use this to calculate each student’s average.

Main Question: (Java Programming ) Please do the basic not a advance that is difficult to understand.

Modify above quiz score program to get the list of student names (one word) and scores from a file. Output will also be to a file, with the average at the end of each line. Name your input file “scores.txt” and your output file “averages.txt”. For this, you may just read the data from the input file and output to the output file. No arrays are need

Solution

the following program is done with using swing from core java which includes dialog box and the technique is used for a windows application, not for the web application. in order to create a web application, we need to implement some advanced java concepts as well.

PROGRAM-

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.*;
class Quiz extends JFrame implements ActionListener{
JPanel panel;
JPanel panelresult;
JRadioButton choice1;
JRadioButton choice2;

JRadioButton choice3;
JRadioButton choice4;
ButtonGroup bg;
JLabel lblmess;
JButton btnext;
String[][] qpa;
String[][] qca;
int qaid;
HashMap<Integer, String> map;

Quiz(){
initializedata();
setTitle(\"Quiz Program\");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(430,350);
setLocation(300,100);
setResizable(false);
Container cont=getContentPane();
cont.setLayout(null);
cont.setBackground(Color.GRAY);
bg=new ButtonGroup();   
choice1=new JRadioButton(\"Choice1\",true);
choice2=new JRadioButton(\"Choice2\",false);
choice3=new JRadioButton(\"Choice3\",false);
choice4=new JRadioButton(\"Choice4\",false);
bg.add(choice1);
bg.add(choice2);
bg.add(choice3);
bg.add(choice4);
lblmess=new JLabel(\"Choose a correct anwswer\");
lblmess.setForeground(Color.BLUE);
lblmess.setFont(new Font(\"Arial\", Font.BOLD, 11));
btnext=new JButton(\"Next\");
btnext.setForeground(Color.GREEN);
btnext.addActionListener(this);
panel=new JPanel();
panel.setBackground(Color.LIGHT_GRAY);
panel.setLocation(10,10);
panel.setSize(400,300);
panel.setLayout(new GridLayout(6,2));
panel.add(lblmess);
panel.add(choice1);
panel.add(choice2);
panel.add(choice3);
panel.add(choice4);
panel.add(btnext);
cont.add(panel);
setVisible(true);
qaid=0;
readqa(qaid);

}

public void actionPerformed(ActionEvent e){

if(btnext.getText().equals(\"Next\")){
if(qaid<9){

map.put(qaid,getSelection());
qaid++;
readqa(qaid);
}
else {
map.put(qaid,getSelection());
btnext.setText(\"Show answers\");

}
}
else if(btnext.getText().equals(\"Show answers\"))
new Report();


}

public void initializedata(){
//qpa stores pairs of question and its possible answers
qpa=new String[10][5];

qpa[0][0]=\"How to run Java program on the command prompt?\";
qpa[0][1]=\"javac JavaProgram\";
qpa[0][2]=\"java JavaProgram\";
qpa[0][3]=\"javac JavaProgram.java\";
qpa[0][4]=\"No one\";

qpa[1][0]=\"What is the use of the println method?\";
qpa[1][1]=\"It is used to print text on the screen.\";
qpa[1][2]=\"It is used to print text on the screen with the line break.\";
qpa[1][3]=\"It is used to read text from keyboard.\";
qpa[1][4]=\"It is used to read text from a file.\";

qpa[2][0]=\"How to read a character from the keyboard?\";
qpa[2][1]=\"char c=System.read()\";
qpa[2][2]=\"char c=System.in.read()\";
qpa[2][3]=\"char c=(char)System.read()\";
qpa[2][4]=\"char c=(char)System.in.read()\";

qpa[3][0]=\"Which one is a single-line comment?\";
qpa[3][1]=\"/...\";
qpa[3][2]=\"//...\";
qpa[3][3]=\"/*...\";
qpa[3][4]=\"/*...*/\";

qpa[4][0]=\"How do you declare an integer variable x?\";
qpa[4][1]=\"int x\";
qpa[4][2]=\"x as Integer\";
qpa[4][3]=\"Int[] x\";
qpa[4][4]=\"No one is correct.\";

qpa[5][0]=\"How do you convert a string of number to a number?\";
qpa[5][1]=\"int num=Integer.parseInt(str_num)\";
qpa[5][2]=\"int num=str_num.toInteger()\";
qpa[5][3]=\"int num=(int)str_num\";
qpa[5][4]=\"int num=(Integer)str_num\";

qpa[6][0]=\"What is the value of x? int x=3>>2\";
qpa[6][1]=\"1\";
qpa[6][2]=\"0\";
qpa[6][3]=\"3\";
qpa[6][4]=\"-3\";

qpa[7][0]=\"How to do exit a loop?\";
qpa[7][1]=\"Using exit\";
qpa[7][2]=\"Using break\";
qpa[7][3]=\"Using continue\";
qpa[7][4]=\"Using terminate\";

qpa[8][0]=\"What is the correct way to allocate one-dimensional array?\";
qpa[8][1]=\"int[size] arr=new int[]\";
qpa[8][2]=\"int arr[size]=new int[]\";
qpa[8][3]=\"int[size] arr=new int[size]\";
qpa[8][4]=\"int[] arr=new int[size]\";

qpa[9][0]=\"What is the correct way to allocate two-dimensional array?\";
qpa[9][1]=\"int[size][] arr=new int[][]\";
qpa[9][2]=\"int arr=new int[rows][cols]\";
qpa[9][3]=\"int arr[rows][]=new int[rows][cols]\";
qpa[9][4]=\"int[][] arr=new int[rows][cols]\";

//qca stores pairs of question and its correct answer
qca=new String[10][2];

qca[0][0]=\"How to run Java program on the command prompt?\";
qca[0][1]=\"java JavaProgram\";

qca[1][0]=\"What is the use of the println method?\";
qca[1][1]=\"It is used to print text on the screen with the line break.\";

qca[2][0]=\"How to read a character from the keyboard?\";
qca[2][1]=\"char c=(char)System.in.read()\";

qca[3][0]=\"Which one is a single-line comment?\";
qca[3][1]=\"//...\";

qca[4][0]=\"How do you declare an integer variable x?\";
qca[4][1]=\"int x\";

qca[5][0]=\"How do you convert a string of number to a number?\";
qca[5][1]=\"int num=Integer.parseInt(str_num)\";

qca[6][0]=\"What is the value of x? int x=3>>2\";
qca[6][1]=\"0\";

qca[7][0]=\"How to do exit a loop?\";
qca[7][1]=\"Using break\";

qca[8][0]=\"What is the correct way to allocate one-dimensional array?\";
qca[8][1]=\"int[] arr=new int[size]\";

qca[9][0]=\"What is the correct way to allocate two-dimensional array?\";
qca[9][1]=\"int[][] arr=new int[rows][cols]\";


//create a map object to store pairs of question and selected answer
map=new HashMap<Integer, String>();

}
public String getSelection(){
String selectedChoice=null;
Enumeration<AbstractButton> buttons=bg.getElements();
while(buttons.hasMoreElements())
{
JRadioButton temp=(JRadioButton)buttons.nextElement();
if(temp.isSelected())
{
selectedChoice=temp.getText();
}
}
return(selectedChoice);
}

public void readqa(int qid){
lblmess.setText(\" \"+qpa[qid][0]);
choice1.setText(qpa[qid][1]);
choice2.setText(qpa[qid][2]);
choice3.setText(qpa[qid][3]);
choice4.setText(qpa[qid][4]);
choice1.setSelected(true);
}
public void reset(){
qaid=0;
map.clear();
readqa(qaid);
btnext.setText(\"Next\");
}
public int calCorrectAnswer(){
int qnum=10;
int count=0;
for(int qid=0;qid<qnum;qid++)
if(qca[qid][1].equals(map.get(qid))) count++;
return count;
}

public class Report extends JFrame{
Report(){
setTitle(\"Answers\");
setSize(850,550);
setBackground(Color.WHITE);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
dispose();
reset();
}
});
Draw d=new Draw();
add(d);
setVisible(true);
}


class Draw extends Canvas{
public void paint(Graphics g){
int qnum=10;
int x=10;
int y=20;
for(int i=0;i<qnum;i++){
//print the 1st column
g.setFont(new Font(\"Arial\",Font.BOLD,12));   
g.drawString(i+1+\". \"+qca[i][0], x,y);
y+=30;   
g.setFont(new Font(\"Arial\",Font.PLAIN,12));   
g.drawString(\" Correct answer:\"+qca[i][1], x,y);
y+=30;
g.drawString(\" Your answer:\"+map.get(i), x,y);
y+=30;
//print the 2nd column
if(y>400)
{y=20;
x=450;
}

}
//Show number of correct answers
int numc=calCorrectAnswer();
g.setColor(Color.BLUE);
g.setFont(new Font(\"Arial\",Font.BOLD,14));
g.drawString(\"Number of correct answers:\"+numc,300,500);


}
}

}

}

public class QuizProgram{

public static void main(String args[]){
new Quiz();
  
}

}