用java设计图形用户界面，功能要求： 1. 要求在文本框中输入有关信息，单击“添加”按钮，在下面的多行文本域中显示输入的的信 息（如姓名、性别、年龄、爱好）； 2. 单击“读取”按钮将文本文件中的信息显示到多行文本域中。 3. 单击“保存”按钮将把多行文本域中的内容保存到文本文件中，并退出窗口。

好的，你的需求可以通过使用Java Swing来设计一个图形用户界面程序来实现。下面是一个示例代码：

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class MyGUI extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;

    private JTextField nameField, genderField, ageField, hobbyField;
    private JTextArea infoArea;
    private JButton addButton, readButton, saveButton;

    public MyGUI() {
        super("My GUI");

        // create the GUI components
        nameField = new JTextField(20);
        genderField = new JTextField(20);
        ageField = new JTextField(20);
        hobbyField = new JTextField(20);
        infoArea = new JTextArea(10, 30);
        addButton = new JButton("Add");
        readButton = new JButton("Read");
        saveButton = new JButton("Save");

        // add the components to the content pane
        JPanel inputPanel = new JPanel();
        inputPanel.add(nameField);
        inputPanel.add(genderField);
        inputPanel.add(ageField);
        inputPanel.add(hobbyField);
        inputPanel.add(addButton);
        JPanel buttonPanel = new JPanel();
        buttonPanel.add(readButton);
        buttonPanel.add(saveButton);
        getContentPane().add(inputPanel, BorderLayout.NORTH);
        getContentPane().add(new JScrollPane(infoArea), BorderLayout.CENTER);
        getContentPane().add(buttonPanel, BorderLayout.SOUTH);

        // add action listeners to the buttons
        addButton.addActionListener(this);
        readButton.addActionListener(this);
        saveButton.addActionListener(this);

        // set the frame properties
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(400, 300);
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == addButton) {
            // get the input values
            String name = nameField.getText();
            String gender = genderField.getText();
            String age = ageField.getText();
            String hobby = hobbyField.getText();

            // add the values to the info area
            infoArea.append(name + "\t" + gender + "\t" + age + "\t" + hobby + "\n");

            // clear the input fields
            nameField.setText("");
            genderField.setText("");
            ageField.setText("");
            hobbyField.setText("");
        } else if (e.getSource() == readButton) {
            // read the file and display the contents in the info area
            try {
                BufferedReader br = new BufferedReader(new FileReader("info.txt"));
                String line;
                while ((line = br.readLine()) != null) {
                    infoArea.append(line + "\n");
                }
                br.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        } else if (e.getSource() == saveButton) {
            // save the contents of the info area to the file
            try {
                BufferedWriter bw = new BufferedWriter(new FileWriter("info.txt"));
                bw.write(infoArea.getText());
                bw.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }

            // exit the program
            System.exit(0);
        }
    }

    public static void main(String[] args) {
        new MyGUI();
    }

}

这个程序创建了一个包含文本框、多行文本域和按钮的图形用户界面。用户可以在文本框中输入信息，然后单击“添加”按钮将信息添加到多行文本域中。用户还可以单击“读取”按钮将文件中的信息显示在多行文本域中，或者单击“保存”按钮将多行文本域中的内容保存到文件中并退出程序。