Using a string to specify an object in Java - string

Question

I have a Combo Bx (Dropdown box) with an index range of 0-20. If there anyways I can use that index to specify which object I want data from? All of the objects use the same naming convention obj0, obj1, obj2, etc. Basically something like this...
public abstract class Person {
private String name;
private String title;
private String email;
private String job;
public Person(String name, String title, String email, String job){
this.name = name;
this.title = title;
this.email = email;
this.job = job;
}
//Getters and Setters
}
public class main extends javax.swing.JFrame {
...misc code...
private void btn_startActionPerformed(java.awt.event.ActionEvent evt) {
Person obj0 = new Person("Jon Doe",
"Program Coordinator",
"jon.doe#test.com",
"Faculty");
Person obj1 = ...
...
Person obj20 = ...
/*
Onclick it uses the index of the current index in the combobox (dropdown)
to specify which object to get the data from.
*/
private void btn_GetActionPerformed(java.awt.event.ActionEvent evt) {
//Uses the obj naming convention plus the index
string foo = "obj" + toString(combobox_Name.getSelectedIndex());
//Fills the textbox using the above string and the getName method
txtbox_username.setText(ToObject(foo).getName);
}

Answer 1

I have created a basic design of what I think you want:
This code creates 20 objects, adds them to a combobox and uses their predefined name when selected to change a textfield.
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BoxLayout;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
class ObjExample {
String name;
public ObjExample(String name) {
this.name = name;
}
#Override
public String toString() {
return name;
}
}
public class Main extends JFrame implements ActionListener {
JComboBox jcb = new JComboBox();
JTextField jtf = new JTextField("Text Field");
public Main() {
setSize(200, 200);
setDefaultCloseOperation(EXIT_ON_CLOSE);
for (int i = 0; i <= 20; i++) {
jcb.addItem(new ObjExample(Integer.toString(i)));
}
jcb.addActionListener(this);
add(jcb);
add(jtf);
setVisible(true);
}
public static void main(String[] args) {
new Main();
}
#Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() == jcb) {
ObjExample obj = (ObjExample) jcb.getSelectedItem();
jtf.setText(obj.toString());
}
}
}