在Eclipse中创建简单的Java GUI应用程序

介绍如何在Eclipse中创建一个简单的Java GUI应用程序，让用户在NotePad中输入文本并将其保存到文本文件中。

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;

public class SimpleGUI extends JFrame {

    private JPanel contentPane;
    private JTextField textField;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    SimpleGUI frame = new SimpleGUI();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public SimpleGUI() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        JLabel lblEnterText = new JLabel("Enter Text:");
        lblEnterText.setBounds(29, 42, 74, 16);
        contentPane.add(lblEnterText);

        textField = new JTextField();
        textField.setBounds(128, 37, 301, 26);
        contentPane.add(textField);
        textField.setColumns(10);

        JButton btnSaveToFile = new JButton("Save to File");
        btnSaveToFile.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                File file = new File("output.txt"); //定义文件名和路径
                try (BufferedWriter bw = new BufferedWriter(new FileWriter(file))) { //通过BufferedWriter写入文件
                    bw.write(textField.getText());
                    bw.newLine();
                    bw.close();
                    textField.setText("");
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        });
        btnSaveToFile.setBounds(128, 87, 117, 29);
        contentPane.add(btnSaveToFile);
    }
}

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