在这个应用程序中，我将把我的主要方法放在哪里

Question

我目前正在处理一项任务，我必须创建一个使用动态数据填充树和列表的应用程序。我以前试过把main方法放在这个类中，唯一一次看起来可以编译的是把所有变量都改为static。我可以把我的主方法放在这个类中吗(我可以放在哪里？(或者我需要另一个类吗？非常感谢。

import javax.swing.DefaultListModel;
import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import Accounts.Client;
import Accounts.ClientLoader;
import Accounts.Account;
import Accounts.Bootstrap;
import Accounts.Portfolio;
import javax.swing.JScrollPane;
import javax.swing.ScrollPaneConstants;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JLabel;
import java.awt.Font;
import javax.swing.JTree;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JMenu;
import javax.swing.JTextArea;
public class FormWindow {
protected JFrame frame;
private DefaultListModel < String > clientDetail = new DefaultListModel < String > ();
private Client person;
private JTextField firstName;
private JTextField lastName;
private JTextField phoneNumber;
public FormWindow(Client person) {
this.person = person;
initialize();
}
private void initialize() {
frame = new JFrame("Client Manager");
frame.setBounds(100, 100, 903, 719);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setHorizontalScrollBarPolicy
(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
scrollPane.setVerticalScrollBarPolicy
(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
scrollPane.setBounds(10, 11, 619, 192);
frame.getContentPane().add(scrollPane);
JTextArea textArea = new JTextArea();
scrollPane.setViewportView(textArea);
firstName = new JTextField(person.getFirstName());
firstName.setBounds(730, 11, 144, 26);
frame.getContentPane().add(firstName);
firstName.setColumns(10);
lastName = new JTextField(person.getLastName());
lastName.setBounds(730, 66, 144, 26);
frame.getContentPane().add(lastName);
lastName.setColumns(10);
phoneNumber = new JTextField(person.getPhoneNumber());
phoneNumber.setBounds(730, 123, 144, 26);
frame.getContentPane().add(phoneNumber);
phoneNumber.setColumns(10);
JButton btnNewButton = new JButton("Update Interface");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
person.setFirstName(firstName.getText());
person.setLastName(lastName.getText());
person.setPhoneNumber(phoneNumber.getText());
repaintForm();
}
});
btnNewButton.setBounds(639, 168, 235, 35);
frame.getContentPane().add(btnNewButton);
JLabel lblNewLabel = new JLabel("First Name");
lblNewLabel.setFont(new Font("Tahoma", Font.PLAIN, 15));
lblNewLabel.setBounds(649, 11, 71, 20);
frame.getContentPane().add(lblNewLabel);
JLabel lblNewLabel_1 = new JLabel("Last Name");
lblNewLabel_1.setFont(new Font("Tahoma", Font.PLAIN, 15));
lblNewLabel_1.setBounds(649, 70, 71, 14);
frame.getContentPane().add(lblNewLabel_1);
JLabel lblNewLabel_2 = new JLabel("      Phone");
lblNewLabel_2.setFont(new Font("Tahoma", Font.PLAIN, 15));
lblNewLabel_2.setBounds(634, 127, 71, 14);
frame.getContentPane().add(lblNewLabel_2);
JScrollPane scrollPane_1 = new JScrollPane();
scrollPane_1.setHorizontalScrollBarPolicy
(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
scrollPane_1.setBounds(10, 214, 425, 436);
frame.getContentPane().add(scrollPane_1);
//needs work: TREE
DefaultMutableTreeNode portfolios = new DefaultMutableTreeNode("Portfolios");
JTree tree = new JTree(portfolios);
scrollPane_1.setViewportView(tree);
JScrollPane scrollPane_2 = new JScrollPane();
scrollPane_2.setHorizontalScrollBarPolicy
(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
scrollPane_2.setBounds(445, 214, 429, 436);
frame.getContentPane().add(scrollPane_2);
JMenuBar menuBar = new JMenuBar();
frame.setJMenuBar(menuBar);
JMenu mnNewMenu = new JMenu("Client");
menuBar.add(mnNewMenu);
JMenuItem mntmNewMenuItem = new JMenuItem("Load Client");
mntmNewMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
mnNewMenu.add(mntmNewMenuItem);
JMenuItem mntmNewMenuItem_1 = new JMenuItem("Save Client");
mnNewMenu.add(mntmNewMenuItem_1);
JMenu mnNewMenu_1 = new JMenu("Portfolios");
menuBar.add(mnNewMenu_1);
JMenuItem mntmNewMenuItem_2 = new JMenuItem("Add Portfolio");
mnNewMenu_1.add(mntmNewMenuItem_2);
JMenuItem mntmNewMenuItem_3 = new JMenuItem("Remove Portfolio");
mnNewMenu_1.add(mntmNewMenuItem_3);
JMenu mnNewMenu_2 = new JMenu("Accounts");
menuBar.add(mnNewMenu_2);
JMenuItem mntmNewMenuItem_4 = new JMenuItem("Add Account");
mnNewMenu_2.add(mntmNewMenuItem_4);
JMenuItem mntmNewMenuItem_5 = new JMenuItem("Remove Account");
mnNewMenu_2.add(mntmNewMenuItem_5);
}
void repaintForm() {
clientDetail.clear();
clientDetail.addElement("First Name: " + person.getFirstName());
clientDetail.addElement("Last Name: " + person.getLastName());
clientDetail.addElement("Phone Number: " + person.getPhoneNumber());
clientDetail.addElement("Total Value: " + person.getClientPortfolioValue());
clientDetail.addElement("Portfolio Count: " + person.getPortfolioCount());
clientDetail.addElement("Portfolio Names: " + person.getClientPortfolioNames());
}
}

Answer 1

考虑在main方法中创建一个FormWindow实例。

1. 将main放入FormWindow类

2. 通过"创建实例"；新的"；主方法内的操作员

   class FormWindow {
   public static void main(String[] args) {
   FormWindow form = new FormWindow(...);
   }
   ...
   }
   

Answer 2

在静态方法中，您只能调用其他静态方法。这就是编译器将方法更改为静态方法的原因。您想要的是用main方法创建另一个类，然后创建FormWindow类的对象。由于构造函数需要一个Client对象，因此需要首先创建该对象。

FormWindow fw = new FormWindow(someClientObject)

Answer 3

您需要另一个类并调用FormWindow类的新实例。如果变量是静态的，则需要将返回值的方法分配给特定的静态变量

Answer 4

我认为你必须为这个类创建一个默认构造函数，它提供一些默认值：

public class FormWindow {
public FormWindow() {
Client personWithDefaultValues = new Client();
//Fill personWithDefaultValues with some data here
}
public static void main(String[] args) {
FormWindow h = new FormWindow();
h.initialize();
}
}