Question

对于我的学校项目，我需要创建一个银行模拟器。所以作为第一步，我应该在键盘上点击按钮时显示屏幕键盘，该值应该转到文本框。我完全是空白。我试过我可以创建键盘。它在一个不同的frame.so我不知道如何在点击按钮时从它检索数据。请帮助人。

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;

public class BankSimulator extends JFrame implements ActionListener {

    JTextField username = new JTextField(10);
    JTextField password = new JTextField(10);
    JTextField name = new JTextField(10);
    JTextField setPassword = new JTextField(5);
    JLabel userlbl = new JLabel("Username");
    JLabel passlbl = new JLabel("Password");
    JRadioButton option1 = new JRadioButton("Basic Account");
    JRadioButton option2 = new JRadioButton("Saver Account");
    JRadioButton option3 = new JRadioButton("Super Account");
    JButton logbtn = new JButton("Log In");
    JButton regbtn = new JButton("Register");
    JButton showkeyboard = new JButton("showkeyboard");
    JButton createbtn = new JButton("Create Account");
    JButton[] btn1 = new JButton[10];
    JButton[] btn2 = new JButton[10];
    JButton[] btn3 = new JButton[9];
    JButton[] btn4 = new JButton[7];

    public static void main(String[] args) {
        BankSimulator bm = new BankSimulator();

    }

    public BankSimulator() {
        setLayout(null);
        setSize(850, 700);
        setTitle("Bank Simulator");
        username.setBounds(350, 150, 130, 20);
        add(username);
        password.setBounds(350, 180, 130, 20);
        add(password);
        option1.setBounds(440, 180, 130, 20);
        option2.setBounds(440, 210, 130, 20);
        option3.setBounds(440, 240, 130, 20);
        add(option1);
        add(option2);
        add(option3);
        option1.setVisible(false);
        option2.setVisible(false);
        option3.setVisible(false);
        name.setBounds(440, 150, 130, 20);
        add(name);
        name.setVisible(false);
        setPassword.setBounds(440, 123, 130, 20);
        add(setPassword);
        setPassword.setVisible(false);
        userlbl.setBounds(288, 150, 130, 20);
        add(userlbl);
        passlbl.setBounds(288, 180, 130, 20);
        add(passlbl);
        logbtn.setBounds(341, 220, 150, 30);
        add(logbtn);
        createbtn.setBounds(435, 270, 150, 30);
        add(createbtn);
        createbtn.setVisible(false);
        logbtn.addActionListener(this);
        regbtn.setBounds(341, 260, 150, 30);
        add(regbtn);
        regbtn.addActionListener(this);

        showkeyboard.setBounds(341, 270, 150, 30);
        add(showkeyboard);
        showkeyboard.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                showkeyboard();
            }

        });
        setVisible(true);

    }

    public void showkeyboard() {

        String nos = "1234567890";
        String alphabet = "abcdefghij";
        String alphabet1 = "klmnopqrs";
        String alphabet2 = "tuvwxyz";

        JFrame myFrame = new JFrame();
        myFrame.setSize(586, 205);
        JPanel myPanel = new JPanel();
        JPanel myPanel1 = new JPanel();
        JPanel myPanel2 = new JPanel();
        JPanel myPanel3 = new JPanel();

        for (int i = 0; i < nos.length(); i++) {
            btn1[i] = new JButton(nos.substring(i, i + 1));
            myPanel.add(btn1[i]);
            btn1[i].addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    keyboardButtonPressed();

                }
            });

            for (int i = 0; i < alphabet.length(); i++) {

                btn2[i] = new JButton(alphabet.substring(i, i + 1));
                myPanel1.add(btn2[i]);

            }
            for (int i = 0; i < alphabet1.length(); i++) {
                btn3[i] = new JButton(alphabet1.substring(i, i + 1));
                myPanel2.add(btn3[i]);
            }

            for (int i = 0; i < alphabet2.length(); i++) {

                btn4[i] = new JButton(alphabet2.substring(i, i + 1));
                myPanel3.add(btn4[i]);
            }

            JPanel outer = new JPanel();
            outer.add(myPanel);
            outer.add(myPanel1);
            outer.add(myPanel2);
            outer.add(myPanel3);
            myFrame.add(outer);
            myFrame.setVisible(true);

        }

    }

    public String keyboardButtonPressed(char a) {

        String alreadyDisplayed = username.getText();
        String toDisplay = alreadyDisplayed + btn1[i].getText();

    }

    public void actionPerformed(ActionEvent e) {

        if (e.getSource() == regbtn) {
            username.setVisible(false);
            password.setVisible(false);
            logbtn.setVisible(false);
            userlbl.setVisible(false);
            passlbl.setVisible(false);
            option1.setVisible(true);
            option2.setVisible(true);
            option3.setVisible(true);
            name.setVisible(true);
            setPassword.setVisible(true);
            regbtn.setVisible(false);
            createbtn.setVisible(true);

        }

    }

}

btn [i] .getText（）无效，说'i'无法解析为变量。

Answer 1

所以，你的基本问题是上下文......

for (int i = 0; i < nos.length(); i++) {
    //...
    for (int i = 0; i < alphabet.length(); i++) {
        //...
    }
    for (int i = 0; i < alphabet1.length(); i++) {
        //...
    }
    for (int i = 0; i < alphabet2.length(); i++) {
        //...
    }

基本上，i已在外部循环中定义，因此您无法重复使用

如何在java eclipsee中为程序创建屏幕键盘

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