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());

    }

}

实验并未完成,主要问题出在最后计算答案的时候,近期调试完后便把完成版发上来,现在先发未完成版,我的总结到时候也跟完成版一起上交....

PS:会出现这种情况完全是我自己太懒没有抓紧做...结果就变成这样了...真是十分抱歉(;´Д`)

PS2:同行的结对人是05莫俊余

PSP:(ﾟДﾟ≡ﾟДﾟ)老师手下留情!