我的意思是你应该考虑从你的控制台程序中提取核心逻辑和数据来创建一个或多个模型类，然后在你的控制台程序或 GUI 中使用它们。
例如，假设您有一个简单的控制台程序，可以从某人那里获取姓名和出生日期信息：
class SimpleConsole {
public static void main(String[] args) throws ParseException {
Scanner scanner = new Scanner(System.in);
System.out.print("Please enter your name: ");
String name = scanner.nextLine();
System.out.print("Please enter your date of birth as mm/dd/yyyy: ");
String dateString = scanner.nextLine();
Date dateOfBirth = new SimpleDateFormat("MM/dd/yyyy").parse(dateString);
Calendar birthday = Calendar.getInstance();
birthday.setTime(dateOfBirth);
Calendar today = Calendar.getInstance();
int age = today.get(Calendar.YEAR) - birthday.get(Calendar.YEAR);
birthday.set(Calendar.YEAR, today.get(Calendar.YEAR));
if (birthday.compareTo(today) > 0) {
age--;
}
System.out.println("Hello, " + name + ". Your age is: " + age);
}
}
我要做的第一件事是从该程序中提取关键信息和逻辑，并创建一个名为 Person 的类，它包含一个名称字符串、一个 dateOfBirth Date 字段和一个 calculateAge() 方法：
class Person {
String name;
Date dateOfBirth;
public Person(String name, Date dateOfBirth) {
this.name = name;
this.dateOfBirth = dateOfBirth;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Date getDateOfBirth() {
return dateOfBirth;
}
public void setDateOfBirth(Date dateOfBirth) {
this.dateOfBirth = dateOfBirth;
}
public int getAge() {
Calendar birthday = Calendar.getInstance();
birthday.setTime(dateOfBirth);
Calendar today = Calendar.getInstance();
int age = today.get(Calendar.YEAR) - birthday.get(Calendar.YEAR);
birthday.set(Calendar.YEAR, today.get(Calendar.YEAR));
if (birthday.compareTo(today) > 0) {
age--;
}
return age;
}
}
现在您可以创建一个使用 Person 的控制台程序：
class BetterConsole {
public static void main(String[] args) throws ParseException {
Scanner scanner = new Scanner(System.in);
System.out.print("Please enter your name: ");
String name = scanner.nextLine();
System.out.print("Please enter your date of birth as mm/dd/yyyy: ");
String dateString = scanner.nextLine();
Date dateOfBirth = new SimpleDateFormat("MM/dd/yyyy").parse(dateString);
Person person = new Person(name, dateOfBirth);
System.out.println("Hello, " + person.getName() + ". Your age is: " + person.getAge());
scanner.close();
}
}
但更重要的是，Person 类可以很容易地用于您想要的任何类型的 GUI 程序。我必须去睡觉，所以我现在不能显示 GUI，但可能明天。
哎呀，这是 GUI 示例：
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.table.AbstractTableModel;
public class BirthdayGui extends JPanel {
private static final String PATTERN = "MM/dd/yyyy";
private JTextField nameField = new JTextField(10);
private SimpleDateFormat simpleDateFormat = new SimpleDateFormat(PATTERN);
private JFormattedTextField birthDayField = new JFormattedTextField(simpleDateFormat);
private PersonTableModel tableModel = new PersonTableModel();
private JTable table = new JTable(tableModel);
public BirthdayGui() {
setLayout(new BorderLayout());;
add(new JScrollPane(table), BorderLayout.CENTER);
add(createDataEntryPanel(), BorderLayout.PAGE_END);
}
private JPanel createDataEntryPanel() {
birthDayField.setColumns(nameField.getColumns());
JPanel dataInPanel = new JPanel();
dataInPanel.add(new JLabel("Enter Name:"));
dataInPanel.add(nameField);
dataInPanel.add(new JLabel("Enter Birthday as " + PATTERN + ":"));
dataInPanel.add(birthDayField);
dataInPanel.add(new JButton(new AddPersonAction("Add Person", KeyEvent.VK_A)));
return dataInPanel;
}
private class AddPersonAction extends AbstractAction {
public AddPersonAction(String name, int mnemonic) {
super(name);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent e) {
String name = nameField.getText();
Date dateOfBirth = (Date) birthDayField.getValue();
Person person = new Person(name, dateOfBirth);
tableModel.addRow(person);
}
}
private class PersonTableModel extends AbstractTableModel {
public final String[] COL_NAMES = {"Name", "Age"};
List<Person> personList = new ArrayList<>();
@Override
public String getColumnName(int column) {
return COL_NAMES[column];
}
@Override
public int getColumnCount() {
return COL_NAMES.length;
}
@Override
public int getRowCount() {
return personList.size();
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
if (rowIndex < 0 || rowIndex >= getRowCount()) {
throw new ArrayIndexOutOfBoundsException(rowIndex);
}
if (columnIndex < 0 || columnIndex >= getColumnCount()) {
throw new ArrayIndexOutOfBoundsException(columnIndex);
}
Person person = personList.get(rowIndex);
if (columnIndex == 0) {
return person.getName();
} else if (columnIndex == 1) {
return person.getAge();
}
return null;
}
@Override
public java.lang.Class<?> getColumnClass(int column) {
if (column == 0) {
return String.class;
} else if (column == 1) {
return Integer.class;
} else {
return super.getColumnClass(column);
}
};
public void addRow(Person person) {
personList.add(person);
int firstRow = personList.size() - 1;
fireTableRowsInserted(firstRow, firstRow);
}
}
private static void createAndShowGui() {
BirthdayGui mainPanel = new BirthdayGui();
JFrame frame = new JFrame("ConsoleGuiEg");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}