java简单计算器，只能鼠标点击数字

package com.bj.jsq;

import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.Dimension;
import java.awt.TextField;
import java.awt.Label;
import java.awt.Button;
import java.awt.Toolkit;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Color;
import java.awt.SystemColor;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;

public class calculator extends JFrame {
    private static final long serialVersionUID = 1L;
    private JPanel contentPane;
    public static double n; 
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    calculator frame = new calculator(); 
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public calculator() {
        setResizable(false);
        setBackground(SystemColor.inactiveCaptionBorder);  //
        setTitle("\u7B80\u5355\u8BA1\u7B97\u5668");
        Dimension screen=Toolkit.getDefaultToolkit().getScreenSize();
        int x=(int)screen.getWidth();
        int y=(int)screen.getHeight();
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds((x-293)/2, (y-333)/2, 293, 315);
        contentPane = new JPanel();
        setContentPane(contentPane);
        contentPane.setLayout(null);
        final TextField txtInput = new TextField();
        
        txtInput.setBounds(62, 10, 205, 23);
        contentPane.add(txtInput);
        final TextField txtOutput = new TextField();
        txtOutput.setEditable(false);
        txtOutput.setBounds(62, 49, 205, 23);
        contentPane.add(txtOutput);
        
        Label label = new Label("input");                 //
        //label.setBackground(UIManager.getColor("window"));
        label.setForeground(new Color(153, 50, 204));
        label.setBounds(15, 10, 41, 23);
        contentPane.add(label);
        
        Label label_1 = new Label("result");             //
        label_1.setForeground(new Color(153, 50, 204));
        label_1.setBounds(15, 49, 41, 23);
        contentPane.add(label_1);
        
        Button btn7 = new Button("7");                  //
        btn7.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                txtInput.setText(txtInput.getText()+"7");
            }
        });
        btn7.setBounds(20, 92, 49, 23);
        contentPane.add(btn7);
        
        Button btn8 = new Button("8");                  ////
        btn8.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                txtInput.setText(txtInput.getText()+"8");
            }
        });
        btn8.setBounds(79, 92, 49, 23);
        contentPane.add(btn8);
        
        Button button_2 = new Button("+");
        button_2.setForeground(new Color(153, 50, 204));
        button_2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                txtInput.setText(txtInput.getText()+" + ");
                
                
            }
        });
        button_2.setBounds(218, 92, 49, 23);
        contentPane.add(button_2);
        
        Button btn9 = new Button("9");
        btn9.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                txtInput.setText(txtInput.getText()+"9");
            }
        });
        btn9.setBounds(147, 92, 49, 23);
        contentPane.add(btn9);
        
        Button btn5 = new Button("5");
        btn5.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                txtInput.setText(txtInput.getText()+"5");
            }
        });
        btn5.setBounds(79, 136, 49, 23);
        contentPane.add(btn5);
        
        Button btn4 = new Button("4");
        btn4.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                txtInput.setText(txtInput.getText()+"4");
            }
        });
        btn4.setBounds(20, 136, 49, 23);
        contentPane.add(btn4);
        
        Button button_6 = new Button("-");
        button_6.setForeground(new Color(153, 50, 204));
        button_6.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                txtInput.setText(txtInput.getText()+" - ");                
            }
        });
        button_6.setBounds(218, 136, 49, 23);
        contentPane.add(button_6);
        
        Button btn6 = new Button("6");
        btn6.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                txtInput.setText(txtInput.getText()+"6");
            }
        });
        btn6.setBounds(147, 136, 49, 23);
        contentPane.add(btn6);
        
        Button btn2 = new Button("2");
        btn2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                txtInput.setText(txtInput.getText()+"2");
            }
        });
        btn2.setBounds(79, 183, 49, 23);
        contentPane.add(btn2);
        
        Button btn1 = new Button("1");
        btn1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                txtInput.setText(txtInput.getText()+"1");
            }
        });
        btn1.setBounds(20, 183, 49, 23);
        contentPane.add(btn1);
        
        Button button_10 = new Button("cls");
        button_10.setForeground(new Color(153, 50, 204));
        button_10.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                txtInput.setText("");
                txtOutput.setText("");
            }
        });
        button_10.setBounds(218, 183, 49, 23);
        contentPane.add(button_10);
        
        Button btn3 = new Button("3");
        btn3.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                txtInput.setText(txtInput.getText()+"3");
            }
        });
        btn3.setBounds(147, 183, 49, 23);
        contentPane.add(btn3);
        
        Button btndel = new Button(".");
        btndel.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                txtInput.setText(txtInput.getText()+".");
            }
        });
        btndel.setBounds(79, 230, 49, 23);
        contentPane.add(btndel);
        
        Button btn0 = new Button("0");
        btn0.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                txtInput.setText(txtInput.getText()+"0");
            }
        });
        btn0.setBounds(20, 230, 49, 23);
        contentPane.add(btn0);
    
        Button btne = new Button("=");  //
        btne.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String str=txtInput.getText();
                String[]ss;
                String regex1="( \\p{Punct} )\\1++";//有若干个标点符号重叠的正则式
                String regex2="( \\p{Punct} )$";//标点符号在行末的正则表达式
                str=str.replaceAll(regex1, "$1");
                str=str.replaceAll(regex2, "");
                int i;
                ss=str.split(" ");
                try{
                n=Double.parseDouble(ss[0]);
                for(i=0;i<ss.length;i++)
                {
                    if(ss[i].equals("+"))
                    {
                        n=n+Double.parseDouble(ss[i+1]);
                    }
                    if(ss[i].equals("-"))
                    {
                        n=n-Double.parseDouble(ss[i+1]);
                    }
                }
                txtOutput.setText(String.valueOf(n));
                }catch(Exception ex){
                    JOptionPane.showMessageDialog(null, "请检查 输入数的格式！！重新输入");
                }
            }
        });
        btne.setForeground(new Color(153, 50, 204));
        btne.setBounds(147, 230, 49, 23);
        contentPane.add(btne);
        
        Button btnSqrt = new Button("sqrt");
        btnSqrt.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String sqrtValue;
                if(txtInput.getText().contains("+")||txtInput.getText().contains("+"))
                    sqrtValue=txtOutput.getText();
                else
                    sqrtValue=txtInput.getText();
                try{
                txtOutput.setText(String.valueOf(Math.sqrt(Double.parseDouble(sqrtValue))));
                }catch(Exception ex){
                    JOptionPane.showMessageDialog(null, "该数不能开方，请检查数据是否错误！");
                }
                }
        });
        btnSqrt.setForeground(new Color(148, 0, 211));
        btnSqrt.setBounds(218, 230, 49, 23);
        contentPane.add(btnSqrt);
        
        JMenuBar menuBar = new JMenuBar();
        menuBar.setBounds(0,267,281, 21);
        contentPane.add(menuBar);
        
        JMenu mnNewMenu = new JMenu("帮助");//\u67E5\u770B
        menuBar.add(mnNewMenu);
        
        JMenuItem mntmh = new JMenuItem("帮助");//\u5E2E\u52A9
        mntmh.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                calHelp ch=new calHelp();
                //ch.show(false);
                ch.setVisible(true);
            }
        });
        mnNewMenu.add(mntmh);
        
        JMenuItem mntmNewMenuItem = new JMenuItem("关于计算器");
        mntmNewMenuItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                calAbout ca=new calAbout();
                ca.setVisible(true);
            }
        });
        mnNewMenu.add(mntmNewMenuItem);
        setVisible(true);
    }
}

package com.bj.jsq;

import java.awt.EventQueue;

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

public class calHelp extends JFrame {

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

    /**
     * Create the frame.
     */
    public calHelp() {
        setResizable(false);
        setTitle("\u5E2E\u52A9");
        setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
        setBounds(100, 100, 293, 372);
        getContentPane().setLayout(null);
        
        JTextArea textArea = new JTextArea();
        textArea.setEditable(false);
        textArea.setText("1.\u529F\u80FD\u4ECB\u7ECD\r\n      (1)\u6570\u5B57\u7684\u52A0\u51CF\uFF1B\u65E0\u4E58\u9664\u529F\u80FD\r\n      (2)\u6570\u5B57\u5F00\u65B9\uFF0C\u4E0D\u8FC7\u6C42\u5F00\u65B9\u7684\u65F6\u5019\u8F93\u5165\u680F\u6700\u597D\u4E0D\u8981\u5B58\u5728\u52A0\u51CF\u7B26\u53F7\uFF0C\u5426\u5219\u4F1A\u63D0\u793A\u4F60\u6570\u5B57\u6837\u5F0F\u9519\u8BEF\r\n      (3)\u6E05\u7A7A\uFF0Ccls\u952E\u53EF\u4EE5\u6E05\u7A7A\u8F93\u5165\u680F\u548C\u7ED3\u679C\u680F\u7684\u6587\u5B57\r\n\r\n2.\u6CE8\u610F\u4E8B\u9879\r\n      (1)\u4E0D\u8981\u7528\u952E\u76D8\u8F93\u5165\u9664\u4E86\u52A0\u51CF\u53F7\u548C\u5C0F\u6570\u70B9\u3001\u6570\u5B57\u5916\u5176\u4ED6\u7684\u5B57\u7B26\u6216\u8005\u6C49\u5B57\t\r\n      (2)\u5982\u679C\u8F93\u5165\u4E86\u91CD\u590D\u7684\u7B26\u53F7\u6216\u8005\u5728\u672B\u5C3E\u51FA\u73B0\u4E86\u7B26\u53F7\uFF0C\u6B64\u8BA1\u7B97\u5668\u80FD\u591F\u6B63\u786E\u5904\u7406\uFF0C\u4F46\u4E5F\u4E0D\u8981\u4E71\r\n\u8F93\u5165\uFF0C\u5F00\u53D1\u8005\u4E5F\u6CA1\u6709\u5168\u9762\u5730\u8003\u8651\r\n      (3)\u7B2C\u4E00\u4E2A\u6570\u5B57\u4E3A\u8D1F\u6570\u7684\u60C5\u51B5\u5F00\u53D1\u8005\u6CA1\u6709\u60F3\u5230\u89E3\u51B3\u65B9\u6848\uFF0C\u6240\u4EE5\u8BF7\u4F7F\u7528\u8005\u5C3D\u91CF\u5C06\u6B63\u6570\u5199\u5728\u7B2C\u4E00\u4E2A\u4F4D\u7F6E\u5427");
        textArea.setBounds(0, 0, 258, 373);
        textArea.setLineWrap(true);
        getContentPane().add(textArea);
        
        JScrollPane scrollPane = new JScrollPane(textArea);
        scrollPane.setBounds(0, 0, 277, 324);
        getContentPane().add(scrollPane);
    }
}

package com.bj.jsq;

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JCheckBox;

public class calAbout extends JFrame {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private JPanel contentPane;

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

    /**
     * Create the frame.
     */
    public calAbout() {
        setResizable(false);
        setTitle("\u5173\u4E8E\u8BA1\u7B97\u5668");
        setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
        setBounds(100, 100, 259, 314);
        setVisible(true);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        JScrollPane scrollPane = new JScrollPane();
        scrollPane.setBounds(5, 5, 233, 266);
        contentPane.add(scrollPane);

        final JTextArea txtrauthor = new JTextArea();
        txtrauthor.setEditable(false);
        txtrauthor
                .setText("\u5173\u4E8E\u8BA1\u7B97\u5668\uFF1A\r\n   @author\t\u5305\u622C\r\n   @version 1.0\r\n   @since 2014\r\n   \u6B64\u8BA1\u7B97\u5668\u53EA\u7528\u4E8E\u4E2A\u4EBA\u6B23\u8D4F\u53CA\u5A31\u4E50\uFF0C\u4E0D\u5F97\u53C2\u4E0E\u5546\u4E1A\u7528\u9014\uFF0C\u5982\u9700\u8F6C\u8F7D\uFF0C\u8BF7\u6CE8\u660E\u51FA\u5904\uFF01\u8C22\u8C22");
        scrollPane.setViewportView(txtrauthor);

        final JCheckBox checkBox = new JCheckBox("\u81EA\u52A8\u6362\u884C");
        checkBox.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if (checkBox.isSelected()) {
                    txtrauthor.setLineWrap(true);
                }
                else
                    txtrauthor.setLineWrap(true);
            }
        });
        scrollPane.setColumnHeaderView(checkBox);
    }

}