I am a newbie in Java, I need help in using Vector class in this assignment import javax.swing.*; public class Main
{
public static void main (String[] args)
{
Info studentinfo[]= new Info[5];
int counter=0;
int option;
String more="";
String add="";
String ss="";
String name="";
String g1,g2,g3,g4,g5,input; int gr[]=new int[5];
for (int y=0;y<5;y++)
{
studentinfo[y]=new Info();
}
do // starting menu //
{
input=JOptionPane.showInputDialog(null, "1.Enter student info" + "\n"
+ "2.Enter Course grades" + "\n"
+ "3. View Total and Average" + "\n"
+ "4. View GPA" + "\n"
+ "5. Summary" + "\n"
+ "6. Exit" + "\n", "Choose option", JOptionPane.PLAIN_MESSAGE);
option=Integer.parseInt(input);
switch(option) // menu options //
{
case 1: if (counter<=5)
{ do{
int index;
boolean find=false;
ss=JOptionPane.showInputDialog("Enter Social Security"); // checking for Social security //
for (int i=0;i {
if ((studentinfo[i].SS).equals(ss))
{
find=true;
index =i;
break;
}
}
if (!find) // If SS found, then continue else prompt user
{
name=JOptionPane.showInputDialog("Enter your name");
add= JOptionPane.showInputDialog("Enter your address");
studentinfo[counter].setName(name); // getting student information //
studentinfo[counter].setAddress(add);
studentinfo[counter].setSS(ss);
counter++;
}
else
JOptionPane.showMessageDialog(null, "Social security exists,Try again","Error", JOptionPane.PLAIN_MESSAGE);
more=JOptionPane.showInputDialog("Do you want more(y/n)");
}
while(((more.equals("Y"))||(more.equals("y"))) &&(counter<5)); // continue 5 more times for 5 students
}
break;
case 2:
int index=0;
boolean find=false;
if (counter<1)
{
JOptionPane.showMessageDialog(null, "Database Empty", "Choose again", JOptionPane.ERROR_MESSAGE); // check to see if information exits //
}
else
{
ss=JOptionPane.showInputDialog("Enter Social Security"); // checking for SS, if exists, continue, else prompted //
for (int i=0;i {
if ((studentinfo[i].SS).equals(ss))
{
find=true;
index =i;
break;
}
}
if (find)
{
g1= JOptionPane.showInputDialog("Enter marks for Course 1");
g2= JOptionPane.showInputDialog("Enter marks for Course 2");
g3= JOptionPane.showInputDialog("Enter marks for Course 3");
g4= JOptionPane.showInputDialog("Enter marks for Course 4");
g5= JOptionPane.showInputDialog("Enter marks for Course 5");
gr[0]= Integer.parseInt(g1); // getting the course marks//
gr[1]= Integer.parseInt(g2);
gr[2]= Integer.parseInt(g3);
gr[3]= Integer.parseInt(g4);
gr[4]= Integer.parseInt(g5);
studentinfo[index].setGrades(gr);
}
else
JOptionPane.showMessageDialog(null, "Social security doesnt exist, Try again ","Error", JOptionPane.PLAIN_MESSAGE);
}
break;
case 3: index=0;
find=false;
if (counter<1)
{
JOptionPane.showMessageDialog(null, "Database Empty", "Choose again", JOptionPane.ERROR_MESSAGE); // checking if information exists//
}
else
{
ss=JOptionPane.showInputDialog("Enter Social Security");
for (int i=0;i {
if ((studentinfo[i].SS).equals(ss))
{
find=true;
index =i;
break;
}
}
if (find)
{
JOptionPane.showMessageDialog(null, "Name=" +studentinfo[index].name+"\n" + "Total" +" "+ studentinfo[index].tot+"/"+"500"+"\n" +" "+ "Average=" +studentinfo[index].ave+"\n", "Arif's little helper", JOptionPane.PLAIN_MESSAGE); // displaying info //
}
else
JOptionPane.showMessageDialog(null, "Social security doesnt exist, Try again", "Error",JOptionPane.PLAIN_MESSAGE); // displaying info //
}
break;
case 4:
index=0;
find=false;
if (counter<1)
{
JOptionPane.showMessageDialog(null, "Database Empty", "Choose again", JOptionPane.ERROR_MESSAGE);
}
else
{
ss=JOptionPane.showInputDialog("Enter Social Security"); // checking for SS, if exists, continue, else prompted //
for (int i=0;i {
if ((studentinfo[i].SS).equals(ss))
{
find=true;
index =i;
break;
}
}
if (find)
{
JOptionPane.showMessageDialog(null, "Name=" +studentinfo[index].name+"\n" + "GPA=" + studentinfo[index].GPA + "\n" // displaiyng gpa//
, "Arif's little helper", JOptionPane.PLAIN_MESSAGE);
}
else
JOptionPane.showMessageDialog(null, "Social security doesnt exist, try again","Error", JOptionPane.PLAIN_MESSAGE);
}
break;
case 5:
if (counter<1)
{
JOptionPane.showMessageDialog(null, "Database Empty", "Choose again", JOptionPane.ERROR_MESSAGE);
}
else
{
for (int x=0;x {
JOptionPane.showMessageDialog(null, "Name=" + studentinfo[x].name // showing summary //
+ "\n" + "Social Security=" + studentinfo[x].SS
+ "\n" + "Address=" + studentinfo[x].address
+ "\n" + "\n" + "\n"
+ "SUMMARY"
+ "\n"
+ "Total=" + studentinfo[x].tot + "/500"
+ "\n" + "Average=" + studentinfo[x].ave
+ "\n" + "GPA=" + studentinfo[x].GPA
+ "\n" + "Your grade is" + " " + studentinfo[x].Grade , "Arif's little helper", JOptionPane.PLAIN_MESSAGE);
}
}
break;
case 6: //exiting program//
JOptionPane.showMessageDialog(null, "Thanks for using this program", "Bye", JOptionPane.PLAIN_MESSAGE);
System.exit(0);
break;
default:
JOptionPane.showMessageDialog(null, "Selection error", "Choose again", JOptionPane.ERROR_MESSAGE);
break; }
}
while (option!=6); // end menu//
}
}
I also have a class of Info.
Now instead of the arrays i need to use vectors so i can have unlimited students, can anyone help. Thanks
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