What collection to use?

From my GUI press "Used Phone Acquisition" when enter is pressed the data will be saved and return to "select option".

Am i going to use queue or vector? and how to add

tf1.setText("");to EventHandler Cancel and Cancel2 to terminate data entry.

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.util.*;

publicclass HPhoneInvextends JFrame{

privateint currentCard = 1;

private JPanel cardPanel;

private CardLayout cl;

JPanel card1 =null;

JPanel card2 =null;

JPanel card3 =null;

public HPhoneInv(){

setTitle("Handphone Inventory System");

setSize(500, 160);

cardPanel =new JPanel(new CardLayout());

JPanel jp1 =new JPanel();

jp1.setLayout(new GridLayout(1,1) );

JLabel jl1 =new JLabel("Select Option:");

jl1.setForeground(Color.RED);

jp1.add(jl1);

JPanel buttonPanel =new JPanel();

buttonPanel.setLayout(new GridLayout(1,2) );

JButton AcqBtn=new JButton("Used Phone Acquisition");

JButton TranBtn=new JButton("Sale Transaction");

buttonPanel.add(AcqBtn);

buttonPanel.add(TranBtn);

card1 =new JPanel(new BorderLayout());

card1.add(jp1, BorderLayout.NORTH);

card1.add(buttonPanel, BorderLayout.SOUTH);

card2 =new JPanel(new BorderLayout());

JPanel jp2 =new JPanel();

jp2.setLayout(new GridLayout(5,2) );

JLabel lbl1 =new JLabel("Cust IC No:");

JLabel lbl2=new JLabel("Brand:");

JLabel lbl3 =new JLabel("Model:");

JLabel lbl4=new JLabel("Serial No:");

JLabel lbl5=new JLabel("Cost:");

JTextField tf1=new JTextField("");

JTextField tf2=new JTextField("");

JTextField tf3=new JTextField("");

JTextField tf4=new JTextField("");

JTextField tf5=new JTextField("");

jp2.add(lbl1);

jp2.add(tf1);

jp2.add(lbl2);

jp2.add(tf2);

jp2.add(lbl3);

jp2.add(tf3);

jp2.add(lbl4);

jp2.add(tf4);

jp2.add(lbl5);

jp2.add(tf5);

JPanel buttonPanel2 =new JPanel();

buttonPanel2.setLayout(new GridLayout(1,2) );

JButton EnterBtn=new JButton("Enter");

JButton CancelBtn=new JButton("Cancel");

buttonPanel2.add(EnterBtn);

buttonPanel2.add(CancelBtn);

card2.add(jp2, BorderLayout.NORTH);

card2.add(buttonPanel2, BorderLayout.SOUTH);

//card 3

card3 =new JPanel(new BorderLayout());

JPanel jp3 =new JPanel();

jp3.setLayout(new GridLayout(4,2) );

JLabel l1 =new JLabel("Serial No:");

JLabel l2 =new JLabel("Model:");

JLabel l3 =new JLabel("Price:");

JTextField t1=new JTextField("");

JTextField t2=new JTextField("");

JTextField t3=new JTextField("");

JTextField t4=new JTextField("");

JButton b =new JButton("Search for Phone Record");

jp3.add(l1);

jp3.add(t1);

jp3.add(b);

jp3.add(t2);

jp3.add(l2);

jp3.add(t3);

jp3.add(l3);

jp3.add(t4);

JPanel buttonPanel3 =new JPanel();

buttonPanel3.setLayout(new GridLayout(1,2) );

JButton Enter2Btn=new JButton("Enter");

JButton Cancel2Btn=new JButton("Cancel");

buttonPanel3.add(Enter2Btn);

buttonPanel3.add(Cancel2Btn);

card3.add(jp3, BorderLayout.NORTH);

card3.add(buttonPanel3, BorderLayout.SOUTH);

cardPanel.add(card1,"one");

cardPanel.add(card2,"two");

cardPanel.add(card3,"three");

this.getContentPane().add(cardPanel);

AcqBtn.addActionListener(new ActionListener(){

publicvoid actionPerformed(ActionEvent arg0){