用JavaGUI框架Swing开发输入法，请给出代码

以下是一个简单的使用Java Swing开发的输入法示例代码：

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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

public class InputMethod extends JFrame {
    private static final long serialVersionUID = 1L;

    private JTextArea textArea;
    private JTextField textField;

    public InputMethod() {
        setTitle("Input Method");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setResizable(false);

        textArea = new JTextArea();
        textField = new JTextField();

        JButton button1 = new JButton("1");
        JButton button2 = new JButton("2");
        JButton button3 = new JButton("3");
        JButton button4 = new JButton("4");
        JButton button5 = new JButton("5");
        JButton button6 = new JButton("6");
        JButton button7 = new JButton("7");
        JButton button8 = new JButton("8");
        JButton button9 = new JButton("9");
        JButton button0 = new JButton("0");
        JButton buttonQ = new JButton("Q");
        JButton buttonW = new JButton("W");
        JButton buttonE = new JButton("E");
        JButton buttonR = new JButton("R");
        JButton buttonT = new JButton("T");
        JButton buttonY = new JButton("Y");
        JButton buttonU = new JButton("U");
        JButton buttonI = new JButton("I");
        JButton buttonO = new JButton("O");
        JButton buttonP = new JButton("P");
        JButton buttonA = new JButton("A");
        JButton buttonS = new JButton("S");
        JButton buttonD = new JButton("D");
        JButton buttonF = new JButton("F");
        JButton buttonG = new JButton("G");
        JButton buttonH = new JButton("H");
        JButton buttonJ = new JButton("J");
        JButton buttonK = new JButton("K");
        JButton buttonL = new JButton("L");
        JButton buttonZ = new JButton("Z");
        JButton buttonX = new JButton("X");
        JButton buttonC = new JButton("C");
        JButton buttonV = new JButton("V");
        JButton buttonB = new JButton("B");
        JButton buttonN = new JButton("N");
        JButton buttonM = new JButton("M");
        JButton buttonSpace = new JButton("Space");
        JButton buttonEnter = new JButton("Enter");

        JPanel panel1 = new JPanel(new GridLayout(4, 10));
        panel1.add(button1);
        panel1.add(button2);
        panel1.add(button3);
        panel1.add(button4);
        panel1.add(button5);
        panel1.add(button6);
        panel1.add(button7);
        panel1.add(button8);
        panel1.add(button9);
        panel1.add(button0);
        panel1.add(buttonQ);
        panel1.add(buttonW);
        panel1.add(buttonE);
        panel1.add(buttonR);
        panel1.add(buttonT);
        panel1.add(buttonY);
        panel1.add(buttonU);
        panel1.add(buttonI);
        panel1.add(buttonO);
        panel1.add(buttonP);
        panel1.add(buttonA);
        panel1.add(buttonS);
        panel1.add(buttonD);
        panel1.add(buttonF);
        panel1.add(buttonG);
        panel1.add(buttonH);
        panel1.add(buttonJ);
        panel1.add(buttonK);
        panel1.add(buttonL);
        panel1.add(buttonZ);
        panel1.add(buttonX);
        panel1.add(buttonC);
        panel1.add(buttonV);
        panel1.add(buttonB);
        panel1.add(buttonN);
        panel1.add(buttonM);
        panel1.add(buttonSpace);
        panel1.add(buttonEnter);

        JPanel panel2 = new JPanel(new BorderLayout());
        panel2.add(textArea, BorderLayout.CENTER);
        panel2.add(textField, BorderLayout.SOUTH);

        add(panel1, BorderLayout.CENTER);
        add(panel2, BorderLayout.SOUTH);

        ActionListener buttonListener = new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String input = textField.getText();
                JButton button = (JButton) e.getSource();
                String text = button.getText();
                if ("Space".equals(text)) {
                    input += " ";
                } else if ("Enter".equals(text)) {
                    textArea.append(input + "\n");
                    input = "";
                } else {
                    input += text.toLowerCase();
                }
                textField.setText(input);
            }
        };

        button1.addActionListener(buttonListener);
        button2.addActionListener(buttonListener);
        button3.addActionListener(buttonListener);
        button4.addActionListener(buttonListener);
        button5.addActionListener(buttonListener);
        button6.addActionListener(buttonListener);
        button7.addActionListener(buttonListener);
        button8.addActionListener(buttonListener);
        button9.addActionListener(buttonListener);
        button0.addActionListener(buttonListener);
        buttonQ.addActionListener(buttonListener);
        buttonW.addActionListener(buttonListener);
        buttonE.addActionListener(buttonListener);
        buttonR.addActionListener(buttonListener);
        buttonT.addActionListener(buttonListener);
        buttonY.addActionListener(buttonListener);
        buttonU.addActionListener(buttonListener);
        buttonI.addActionListener(buttonListener);
        buttonO.addActionListener(buttonListener);
        buttonP.addActionListener(buttonListener);
        buttonA.addActionListener(buttonListener);
        buttonS.addActionListener(buttonListener);
        buttonD.addActionListener(buttonListener);
        buttonF.addActionListener(buttonListener);
        buttonG.addActionListener(buttonListener);
        buttonH.addActionListener(buttonListener);
        buttonJ.addActionListener(buttonListener);
        buttonK.addActionListener(buttonListener);
        buttonL.addActionListener(buttonListener);
        buttonZ.addActionListener(buttonListener);
        buttonX.addActionListener(buttonListener);
        buttonC.addActionListener(buttonListener);
        buttonV.addActionListener(buttonListener);
        buttonB.addActionListener(buttonListener);
        buttonN.addActionListener(buttonListener);
        buttonM.addActionListener(buttonListener);
        buttonSpace.addActionListener(buttonListener);
        buttonEnter.addActionListener(buttonListener);

        pack();
        setLocationRelativeTo(null);
        setVisible(true);
    }

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

该输入法界面包括一个文本框和一个文本区域，用户可以通过点击按钮来输入字符并将其显示在文本框中。当用户点击“Enter”按钮时，输入的文本将被添加到文本区域中。