实验二 四则运算 未完成版

package size;

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JTextField;
import javax.swing.JTextArea;

import java.awt.Color;

import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JButton;
import javax.swing.JScrollPane;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.io.*;

public class vvvv extends JFrame implements ActionListener {
    private static final long serialVersionUID = 1L;
    int x;//题目个数
    int y=0;
    int n;
    int i=1;
    char[] op = { ‘+‘, ‘-‘, ‘*‘, ‘/‘ };
    int[] nov = new int[4];
    int zf;//控制正负
    String str = new String();
    String str1 = new String();
    int[] num1 = new int[5];
    String s[] = new String[5];
    int num2=0;
    int[] anser=new int[5];//用户的答案
    float[] trueanser=new float[5];//正确答案
    File file;
    int a = 0;
    int b = 0;
    // int c = 0;
    public JFrame vvvv;
    JTextArea ck;
    private JTextField xmt;
    private JButton yes;
    private JButton no;
    private JButton start;
    private JButton huan;
    private JPanel panel;
    private JScrollPane scrollPane;

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

    /**
     * Create the application.
     */
    public vvvv() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        vvvv = new JFrame();
        vvvv.getContentPane().setEnabled(false);
        vvvv.getContentPane().setBackground(Color.GRAY);
        vvvv.setTitle("\u56DB\u5219\u8FD0\u7B97");
        vvvv.setBounds(100, 100, 494, 270);
        vvvv.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        vvvv.setResizable(false);

        vvvv.getContentPane()
                .setLayout(new FlowLayout(FlowLayout.CENTER, 5, 5));

        panel = new JPanel();
        vvvv.getContentPane().add(panel);

        ck = new JTextArea(10, 40);
        // panel.add(ck);
        // ck.setEditable(false);

        scrollPane = new JScrollPane(ck);
        panel.add(scrollPane);

        xmt = new JTextField();
        vvvv.getContentPane().add(xmt);
        xmt.addActionListener(this);
        xmt.setColumns(10);

        yes = new JButton("\u786E\u8BA4");
        vvvv.getContentPane().add(yes);
        yes.addActionListener(this);

        no = new JButton("\u6E05\u7A7A");
        no.addActionListener(this);
        vvvv.getContentPane().add(no);

        huan = new JButton("\u6362\u80A4");
        huan.addActionListener(this);
        vvvv.getContentPane().add(huan);
        
        start = new JButton("开始");
        start.addActionListener(this);
        vvvv.getContentPane().add(start);
    }
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == yes)
        {
            if(b==1)
            {
                if(xmt.getText().length()!=0)
                try
                {
                    x=Integer.parseInt(xmt.getText());
                    b++;
                }
                catch(NumberFormatException x)
                {
                    ck.setText("输入有误!");
                }
                else ck.setText("输入有误!");
            }
            if(b==2)
            {
                if(n!=0)anser[i-2]=Integer.parseInt(xmt.getText());
                str1="第"+i+"条题目为:";
                n = (int) (Math.random() * 4 + 2);//随机出运算符的数量
                for (int j = 0; j < n; j++)
                {
                    zf = (int) (Math.random() * 2);
                    if (zf == 0)// 负
                        num1[j] = -(int) (Math.random() * 100);//产生随机数
                    else        // 正
                        num1[j] = (int) (Math.random() * 100);
                }
                for (int k = 0; k < n - 1; k++)
                {
                    nov[k]=(int)(Math.random()*4);
                    if(nov[k]==3&&num1[k+1]==0)
                    {
                        do
                        {
                            num1[k + 1]=(int)(Math.random()*100);
                        }while(num1[k + 1]==0);
                    }
                }
                str="";
                for(int j=0;j<n;j++)
                {
                    if(num1[j]<0)str=str+"("+String.valueOf(num1[j])+")";
                    else str=str+String.valueOf(num1[j]);
                    if(j==n-1)
                    {
                        try
                        {
                            trueanser[i-1]=opt(str);
                        }
                        catch (Exception e1)
                        {
                            System.out.println(e1);
                            //e1.printStackTrace();
                        }
                        str=str+"=";
                        //str=str+String.valueOf(trueanser[i-1]);
                        ck.setText(str1+str);
                        break;
                    }
                    str=str+op[nov[j]];
                }
                if(i==x+1)
                {
                    b=3;
                    anser[i-2]=Integer.parseInt(xmt.getText());
                }
                else i++;
            }
            if(b==3)
            {
                for(int j=0;j<x;j++)
                {
                    if(anser[j]==(int)trueanser[j])y++;
                }
                ck.setText("答题完成!答对"+y+"道!");
                b=0;
            }
        }
        if (e.getSource() == no)
        {
            xmt.setText(null);
        }
        if (e.getSource() == huan)
        {
            if (a == 0) {
                vvvv.getContentPane().setBackground(Color.blue);
                a++;
            }
            else if (a == 1) {
                vvvv.getContentPane().setBackground(Color.yellow);
                a++;
            }
            else if (a == 2) {
                vvvv.getContentPane().setBackground(Color.gray);
                a = 0;
            }
        }
        if (e.getSource() == start)
        {
            ck.setText("欢迎使用四则运算练习系统\n请输入题目的数量(1-5)");
            n=0;
            i=1;
            b=1;
        }
    }
    public static float opt(String s) throws Exception{
        if(s == null || "".equals(s.trim()))
        {
            return 0f;
        }
        int a1=s.indexOf("+");
        int a2=s.indexOf("-");
        int a3=s.indexOf("*");
        int a4=s.indexOf("/");
        int a5=s.indexOf("(");
        if(a1==-1&&a2==-1&&a3==-1&&a4==-1)
        {
            if(s.trim()==null||"".equals(s.trim()))
            {
                throw new Exception("operate error");
            }
            return Float.parseFloat(s.trim());
        }
        if(a5!=-1)
        {
            int a6=s.indexOf(")");
            if(a6==-1)
            {
                throw new Exception("括号不匹配");
            }
            else
            {
                float f=opt(s.substring(a5+1,a6).trim());
                s=s.replace(s.substring(a5,a6+1), String.valueOf(f));
                return opt(s);
            }
        }
        if(a1!=-1)
        {
            return opt(s.substring(0,a1))+opt(s.substring(a1+1,s.length()));
        }
        if(a2!=-1)
        {
            return opt(s.substring(0,a2))-opt(s.substring(a2+1,s.length()));
        }
        if(a3!=-1)
        {
            return opt(s.substring(0,a3))*opt(s.substring(a3+1,s.length()));
        }
        if(a4!=-1)
        {
            return opt(s.substring(0,a4))/opt(s.substring(a4+1,s.length()));
        }
        return Integer.parseInt(s.trim());
    }
}