Jlist返回值为null
问题描述 投票：0回答：0
jlist 应该显示用户输入的名字、中间名和姓氏，我尝试为列表单独创建另一个 Jframe 但它变得更加混乱所以我停止了。
package mycode.commons;
import java.awt.EventQueue;
import java.util.ArrayList;
import mycode.views.Order;
public class Mymain {
private static ArrayList<user> List;
public static void main(String[] args) {
List = new ArrayList<user>();
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Order frame = new Order(List);
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
}
package mycode.views;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import mycode.commons.user;
import java.awt.Color;
import java.awt.Panel;
import java.awt.Label;
import java.awt.Font;
import javax.swing.JTextField;
import javax.swing.JRadioButton;
import javax.swing.DefaultComboBoxModel;
import javax.swing.DefaultListModel;
import javax.swing.JComboBox;
import java.awt.event.ItemListener;
import java.util.ArrayList;
import java.awt.event.ItemEvent;
import javax.swing.JButton;
import javax.swing.ButtonGroup;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JTextArea;
import javax.swing.JList;
import java.awt.Toolkit;
import javax.swing.JLabel;
public class Order extends JFrame {
private JPanel contentPane;
private JTextField fname;
private JTextField mname;
private JTextField lname;
private JTextField address;
private JComboBox price;
private JComboBox size;
private final ButtonGroup btngrp_color = new ButtonGroup();
private JButton btnorder;
private JRadioButton rdbtnblack;
private JRadioButton rdbtnblue;
private JRadioButton rdbtngreen;
String color = null;
private JTextArea tapreview;
private JButton viewusers;
private JList<String> list;
private ArrayList<user> List;
DefaultListModel<String> dlm = new DefaultListModel<String>();
/**
* Launch the application.
*/
public static void main(String[] args) {
}
/**
* Create the frame.
*/
public Order(ArrayList<user> a) {
this.List = a;
setIconImage(Toolkit.getDefaultToolkit().getImage(Order.class.getResource("/mycode/resources/black.png")));
initComponents();
createEvents();
}
private void createEvents() {
viewusers.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
dlm.clear(); for(user p : List ){ dlm.addElement(p.toString()); }
list.setModel(dlm);
List.add(new user(fname.getText(),mname.getText(),
lname.getText()));
dlm.clear(); for(user p : List ){ dlm.addElement(p.toString()); }
list.setModel(dlm);
}
});
size.addItemListener(new ItemListener() {
String[] XXL = {"", "1500 pesos"};
String[] XL = {"", "1200 pesos"};
String[] Large = {"", "900 pesos"};
String[] Medium = {"", "500 pesos"};
String[] Small = {"", "450 pesos"};
String[] Xtra_small = {"", "350 pesos"};
public void itemStateChanged(ItemEvent e) {
switch(size.getSelectedIndex()) {
case 0:
price.setEnabled(false);
break;
case 1:
price.setEnabled(true);
price.setModel(new DefaultComboBoxModel(XXL));
break;
case 2:
price.setEnabled(true);
price.setModel(new DefaultComboBoxModel(XL));
break;
case 3:
price.setEnabled(true);
price.setModel(new DefaultComboBoxModel(Large));
break;
case 4:
price.setEnabled(true);
price.setModel(new DefaultComboBoxModel(Medium));
break;
case 5:
price.setEnabled(true);
price.setModel(new DefaultComboBoxModel(Small));
break;
case 6:
price.setEnabled(true);
price.setModel(new DefaultComboBoxModel(Xtra_small));
break;
}
}
});
btnorder.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(null,
"Your order is on the way ",
"Please wait patiently...",
JOptionPane.PLAIN_MESSAGE);
if(rdbtnblack.isSelected()) {
color = "Black";
}else if(rdbtnblue.isSelected()){
color = "Blue";
}else if(rdbtngreen.isSelected()){
color = "Green";
}
tapreview.setText("Your Name is " + fname.getText() + " " + mname.getText() + " " + lname.getText() +
"\nYour address is " + address.getText() +
"\nYour order is " + size.getSelectedItem() + " " + color + " shirt " +
"\nfor " + price.getSelectedItem());
}
});
price.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
rdbtnblack.setEnabled(true);
rdbtnblue.setEnabled(true);
rdbtngreen.setEnabled(true);
}
});
rdbtnblack.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
btnorder.setEnabled(true);
}
});
rdbtnblue.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
btnorder.setEnabled(true);
}
});
rdbtngreen.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
btnorder.setEnabled(true);
}
});
}
private void initComponents() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 1340, 510);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JPanel panel = new JPanel();
panel.setBackground(new Color(64, 128, 128));
panel.setBounds(0, 0, 1326, 473);
contentPane.add(panel);
panel.setLayout(null);
Panel panel_1 = new Panel();
panel_1.setLayout(null);
panel_1.setBackground(new Color(13, 217, 171));
panel_1.setBounds(10, 10, 976, 104);
panel.add(panel_1);
Label Firstname = new Label("Firstname");
Firstname.setFont(new Font("Arial Narrow", Font.BOLD | Font.ITALIC, 15));
Firstname.setBounds(127, 10, 120, 21);
panel_1.add(Firstname);
Label Middlename = new Label("Middlename");
Middlename.setFont(new Font("Arial Narrow", Font.BOLD | Font.ITALIC, 15));
Middlename.setBounds(433, 10, 136, 21);
panel_1.add(Middlename);
Label Lastname = new Label("Lastname");
Lastname.setFont(new Font("Arial Narrow", Font.BOLD | Font.ITALIC, 15));
Lastname.setBounds(765, 10, 109, 21);
panel_1.add(Lastname);
fname = new JTextField();
fname.setColumns(10);
fname.setBounds(26, 45, 290, 37);
panel_1.add(fname);
mname = new JTextField();
mname.setColumns(10);
mname.setBounds(342, 45, 290, 37);
panel_1.add(mname);
lname = new JTextField();
lname.setColumns(10);
lname.setBounds(658, 45, 290, 37);
panel_1.add(lname);
Panel panel_2 = new Panel();
panel_2.setLayout(null);
panel_2.setBackground(new Color(13, 217, 171));
panel_2.setBounds(10, 134, 976, 93);
panel.add(panel_2);
Label Address = new Label("Address");
Address.setFont(new Font("Arial Narrow", Font.BOLD | Font.ITALIC, 15));
Address.setBounds(444, 10, 102, 21);
panel_2.add(Address);
address = new JTextField();
address.setColumns(10);
address.setBounds(10, 37, 956, 37);
panel_2.add(address);
Panel panel_3 = new Panel();
panel_3.setLayout(null);
panel_3.setBackground(new Color(13, 217, 171));
panel_3.setBounds(10, 254, 203, 80);
panel.add(panel_3);
size = new JComboBox();
size.setModel(new DefaultComboBoxModel(new String[] {"", "XXL", "XL", "Large", "Medium", "Small", "Xtra small"})); //size choices
size.setBounds(27, 37, 148, 30);
panel_3.add(size);
Label Size = new Label("Size");
Size.setFont(new Font("Arial Narrow", Font.BOLD | Font.ITALIC, 15));
Size.setBounds(82, 10, 59, 21);
panel_3.add(Size);
Panel panel_4 = new Panel();
panel_4.setLayout(null);
panel_4.setBackground(new Color(13, 217, 171));
panel_4.setBounds(283, 254, 203, 80);
panel.add(panel_4);
Label Price = new Label("Price");
Price.setFont(new Font("Arial Narrow", Font.BOLD | Font.ITALIC, 15));
Price.setBounds(77, 10, 75, 21);
panel_4.add(Price);
price = new JComboBox();
price.setEnabled(false);
price.setBounds(23, 37, 154, 30);
panel_4.add(price);
Panel panel_5 = new Panel();
panel_5.setLayout(null);
panel_5.setBackground(new Color(13, 217, 171));
panel_5.setBounds(557, 254, 429, 80);
panel.add(panel_5);
Label color = new Label("Color");
color.setFont(new Font("Arial Narrow", Font.BOLD | Font.ITALIC, 15));
color.setBounds(184, 10, 82, 21);
panel_5.add(color);
rdbtnblack = new JRadioButton("Black");
rdbtnblack.setEnabled(false);
btngrp_color.add(rdbtnblack);
rdbtnblack.setFont(new Font("Segoe Script", Font.BOLD, 12));
rdbtnblack.setBounds(30, 37, 103, 30);
panel_5.add(rdbtnblack);
rdbtnblue = new JRadioButton("Blue");
rdbtnblue.setEnabled(false);
btngrp_color.add(rdbtnblue);
rdbtnblue.setFont(new Font("Segoe Script", Font.BOLD, 12));
rdbtnblue.setBounds(163, 37, 103, 30);
panel_5.add(rdbtnblue);
rdbtngreen = new JRadioButton("Green");
rdbtngreen.setEnabled(false);
btngrp_color.add(rdbtngreen);
rdbtngreen.setFont(new Font("Segoe Script", Font.BOLD, 12));
rdbtngreen.setBounds(296, 37, 103, 30);
panel_5.add(rdbtngreen);
btnorder = new JButton("Order");
btnorder.setEnabled(false);
btnorder.setFont(new Font("Segoe Script", Font.BOLD, 12));
btnorder.setBounds(424, 378, 132, 64);
panel.add(btnorder);
tapreview = new JTextArea();
tapreview.setBackground(Color.WHITE);
tapreview.setBounds(1005, 41, 302, 144);
panel.add(tapreview);
list = new JList();
list.setBounds(1005, 226, 311, 144);
panel.add(list);
viewusers = new JButton("View Users");
viewusers.setFont(new Font("Segoe Script", Font.BOLD, 12));
viewusers.setBounds(1099, 411, 123, 21);
panel.add(viewusers);
JLabel preview = new JLabel("Preview");
preview.setForeground(new Color(255, 255, 255));
preview.setBackground(new Color(255, 255, 255));
preview.setFont(new Font("Segoe Script", Font.BOLD, 15));
preview.setBounds(1124, 10, 80, 21);
panel.add(preview);
}
}
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