小编use*_*336的帖子

import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Color;
import javax.swing.JLabel;

public class Calculator extends JFrame implements ActionListener {

    private JPanel contentPane;
    JButton button, btnNewButton, button_1, button_2, button_3, button_4,
            button_5, button_6, button_7, button_8, btnClear, btnNewButton_1,
            button_9, btnX, button_11;
    JLabel lblNewLabel;
    int v1 = 0;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Calculator frame = new Calculator();
                    frame.setVisible(true);
                } catch …