JAVA While taking advantage of inheritance, define classes required to create st

Question

JAVA

While taking advantage of inheritance, define classes required to create student and lecturer objects. Assume that both objects have id, name and gender attributes. Also assume that the student objects have an additional attribute called marks and the lecturer objects have a method that changes the student’s marks. This method should be defined to take a student object and a number as arguments.

Write a program that creates one student and lecturer object. The program should invoke the lecturer object’s method to change the student’s marks. The program should also display the details of the student object, including the student’s new marks.

Explanation / Answer

package grade;
import javax.swing.*;
public class Grade
{
private static String outputStr;
public static void main(String[]args)
{
int test1,test2,test3,test4,test5,a,b,c,d,e,t,w,x,y,z;
double average1,average2,average3;
char A,B,C,D,F,Grade1,Grade2,Grade3;
String student1Str,student2Str,student3Str,test1Str,test2Str,test3Str,test4Str,test5Str,aStr,bStr,cStr,dStr,eStr,tStr,wStr,xStr,yStr,zStr;
{
student1Str=JOptionPane.showInputDialog("Enter first student's name: ");
student2Str=JOptionPane.showInputDialog("Enter second student's name: ");
student3Str=JOptionPane.showInputDialog("Enter third student's name: ");
test1Str=JOptionPane.showInputDialog("Enter the first score of the first student: ");
test1=Integer.parseInt(test1Str);
test2Str=JOptionPane.showInputDialog("Enter the second score of the first student: ");
test2=Integer.parseInt(test2Str);
test3Str=JOptionPane.showInputDialog("Enter the third score of the first student: ");
test3=Integer.parseInt(test3Str);
test4Str=JOptionPane.showInputDialog("Enter the fourth score of the first student: ");
test4=Integer.parseInt(test4Str);
test5Str=JOptionPane.showInputDialog("Enter the fifth score of the first student: ");
test5=Integer.parseInt(test5Str);
average1=(test1+test2+test3+test4+test5)/5;
{
if(average1>=90)
Grade1='A';
else if(average1>=80)
Grade1='B';
else if(average1>=70)
Grade1='C';
else if(average1>=60)
Grade1='D';
else
Grade1='F';
}
}
{
aStr=JOptionPane.showInputDialog("Enter the first score of the second student: ");
a=Integer.parseInt(aStr);
bStr=JOptionPane.showInputDialog("Enter the second score of the second student: ");
b=Integer.parseInt(bStr);
cStr=JOptionPane.showInputDialog("Enter the third score of the second student: ");
c=Integer.parseInt(cStr);
dStr=JOptionPane.showInputDialog("Enter the fourth score of the second student: ");
d=Integer.parseInt(dStr);
eStr=JOptionPane.showInputDialog("Enter the fifth score of the second student: ");
e=Integer.parseInt(eStr);
average2=(a+b+c+d+e)/5;
{
if(average2>=90)
Grade2='A';
else if(average2>=80)
Grade2='B';
else if(average2>=70)
Grade2='C';
else if(average2>=60)
Grade2='D';
else
Grade2='F';
}
}
{
tStr=JOptionPane.showInputDialog("Enter the first score of the second student: ");
t=Integer.parseInt(tStr);
wStr=JOptionPane.showInputDialog("Enter the second score of the second student: ");
w=Integer.parseInt(wStr);
xStr=JOptionPane.showInputDialog("Enter the third score of the second student: ");
x=Integer.parseInt(xStr);
yStr=JOptionPane.showInputDialog("Enter the fourth score of the second student: ");
y=Integer.parseInt(yStr);
zStr=JOptionPane.showInputDialog("Enter the fifth score of the second student: ");
z=Integer.parseInt(zStr);
average3=(t+w+x+y+z)/5;
{
if(average3>=90)
Grade3='A';
else if(average3>=80)
Grade3='B';
else if(average3>=70)
Grade3='C';
else if(average3>=60)
Grade3='D';
else
Grade3='F';
}
}
outputStr="Name: "+student1Str+" "+"Average: "+average1+" "+"Grade: "+Grade1+" Name: "+student2Str+" "+"Average: "+average2+" "+"Grade: "+Grade2+" Name: "+student3Str+" "+"Average: "+average3+" "+"Grade: "+Grade3;
JOptionPane.showMessageDialog(null,outputStr,"Grade",JOptionPane.PLAIN_MESSAGE);
}
}

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