改进后的四则运算

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.math.RoundingMode;
import java.util.Random;
import java.util.regex.Pattern;

import javax.swing.JButton;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;

/*
 * Test.java
 *
 * Created on __DATE__, __TIME__
 */

/**
 *
 * @author  __USER__
 */
public class Test extends javax.swing.JFrame {
    public String tmnum;//输入的题目数量
    public int n=0;//实际拿来计算的题目数量
    public String s[] = new String[5];
    Pattern pattern = Pattern.compile("[0-9]*");
    public int result[] = new int[5];
    private JPanel panel;
    static JTextField[] textField = new JTextField[5];
    long startTime;
    long endTime;
    long time;
    JLabel labelresult = new JLabel("提交后结果在这里展示");

    /** Creates new form Test */
    public Test() {
        super("四则运算");
        getContentPane().setBackground(new Color(255, 255, 0));
        setBackground(new Color(255, 255, 255));
        setForeground(new Color(255, 255, 255));
        this.setSize(700, 600);
        this.setLocation(350, 50);// 主窗口位置
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setResizable(true);
        tmnum = JOptionPane.showInputDialog("请输入题目个数（题目数不能大于5）：");
        while (true) {

            if (pattern.matcher(tmnum).matches()) {// 如果输入的是数字就执行
                n = Integer.parseInt(tmnum);
                if (n <= 0 || n >= 6) {
                    tmnum = JOptionPane.showInputDialog("输入错误！（题目数不能大于5）：");
                } else {
                    n = Integer.parseInt(tmnum);
                    break;
                }
            } else {
                tmnum = JOptionPane.showInputDialog("输入错误！（题目数不能大于5）：");
            }
        }
        ;
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    //GEN-BEGIN:initComponents
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {
        timu();
        panel = new JPanel();
        panel.setForeground(new Color(0, 0, 0));
        panel.setBackground(new Color(253, 245, 230));
        getContentPane().add(panel, BorderLayout.CENTER);
        GridBagLayout gbl_p1 = new GridBagLayout();
        gbl_p1.columnWidths = new int[] { 0, 0, 0 };
        gbl_p1.rowHeights = new int[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
        gbl_p1.columnWeights = new double[] { 0.0, 0.0, Double.MIN_VALUE };
        gbl_p1.rowWeights = new double[] { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
                0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE };
        panel.setLayout(gbl_p1);
        for (int i = 0; i < n; i++) {
            JLabel label = new JLabel(s[i]);// 第一题标签
            label.setBackground(new Color(144, 238, 144));
            label.setFont(new Font("Batang", Font.PLAIN, 24));
            label.setHorizontalAlignment(SwingConstants.LEFT);
            GridBagConstraints gbc_label = new GridBagConstraints();
            gbc_label.anchor = GridBagConstraints.SOUTH;
            gbc_label.fill = GridBagConstraints.HORIZONTAL;
            gbc_label.insets = new Insets(0, 20, 20, 0);
            gbc_label.gridx = 0;
            gbc_label.gridy = i+1;
            panel.add(label, gbc_label);
            textField[i] = new JTextField(10);
            GridBagConstraints gbc_textField = new GridBagConstraints();
            gbc_textField.anchor = GridBagConstraints.SOUTH;
            gbc_textField.insets = new Insets(0, 0, 20, 10);
            gbc_textField.fill = GridBagConstraints.HORIZONTAL;
            gbc_textField.gridx = 1;
            gbc_textField.gridy = i + 1;
            textField[i].setColumns(10);
            panel.add(textField[i], gbc_textField);
        }
        labelresult.setBackground(new Color(144, 238, 144));
        labelresult.setFont(new Font("Batang", Font.PLAIN, 24));
        labelresult.setHorizontalAlignment(SwingConstants.LEFT);
        GridBagConstraints gbc_label = new GridBagConstraints();
        gbc_label.anchor = GridBagConstraints.SOUTH;
        gbc_label.fill = GridBagConstraints.HORIZONTAL;
        gbc_label.insets = new Insets(0, 20, 20, 0);
        gbc_label.gridx = 0;
        gbc_label.gridy = 6;
        panel.add(labelresult, gbc_label);
        JButton jButton1 = new JButton("提交");// 提交按钮
        GridBagConstraints gbc_btnNewButton = new GridBagConstraints();
        gbc_btnNewButton.anchor = GridBagConstraints.NORTHWEST;
        gbc_btnNewButton.insets = new Insets(0, 100, 20, 40);
        gbc_btnNewButton.gridx = 0;
        gbc_btnNewButton.gridy = 0;
        panel.add(jButton1, gbc_btnNewButton);

        JButton jButton2 = new JButton("退出");// 退出按钮
        GridBagConstraints gbc_button = new GridBagConstraints();
        gbc_button.insets = new Insets(0, 0, 20, 40);
        gbc_button.anchor = GridBagConstraints.NORTHWEST;
        gbc_button.gridx = 1;
        gbc_button.gridy = 0;
        panel.add(jButton2, gbc_button);

        JButton jButton3 = new JButton("换肤");
        GridBagConstraints gbc_hybutton = new GridBagConstraints();
        gbc_hybutton.anchor = GridBagConstraints.NORTHWEST;
        gbc_hybutton.insets = new Insets(0, 0, 0, 5);
        gbc_hybutton.gridx = 2;
        gbc_hybutton.gridy = 0;
        panel.add(jButton3, gbc_hybutton);
        startTime = System.currentTimeMillis();// 开始时间
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });

        

        pack();
    }

    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
        panel.setBackground(new Color(254, 235, 150));
    }

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
        System.exit(0);
    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        endTime = System.currentTimeMillis();
        time = endTime - startTime;
        int time1 = (int) (time / 1000);
        String s = "一共用时:"+time1+"s";
        int count=0;
        for (int i = 0; i < n; i++) {
            String str = textField[i].getText();
            String result = String.valueOf(this.result[i]);
            if(result.equals(str)){
                count +=1;
            }
        }
        s += "一共答对"+count+"题";
        labelresult.setText(s);
        labelresult.setFont(new Font("仿宋", Font.PLAIN, 20));
    }

    public void timu() {// 题目
        char[] cal = { ‘+‘, ‘-‘, ‘*‘, ‘/‘ };
        Random ra = new Random();
        int paramType;// 数值类型
        int topicType;// 题目类型
        int a;
        int b;
        char c;
        int result = 0;
        String str = new String();

        for (int i = 0; i < n; i++) {
            topicType = ra.nextInt(2);
            if (topicType == 0) {// 正常四则运算
                paramType = ra.nextInt(2);
                if (paramType == 0){// 负数
                    a = -ra.nextInt(100);// 控制随机数数值
                }
                else{// 正数
                    a = ra.nextInt(100);// 控制随机数数值
                }
                paramType = ra.nextInt(2);
                if (paramType == 0){// 负数
                    b = -ra.nextInt(100);// 控制随机数数值
                }
                else{// 正数
                    b = ra.nextInt(100);// 控制随机数数值
                }
                int index = ra.nextInt(cal.length);// 生成符号，随机数
                c = cal[index];
                if(a<0){
                    str += "("+a+")";
                } else {
                    str += ""+a;
                }
                str += c;
                if(b<0){
                    str += "("+b+")=";
                } else {
                    str += b+"=";
                }
                s[i] = str;
                str = new String();
                switch (c) {// 计算随机数的值
                case ‘+‘: {
                    result = a + b;
                }
                    break;
                case ‘-‘: {
                    result = a - b;
                }
                    break;
                case ‘*‘: {
                    result = a * b;
                }
                    break;
                case ‘/‘: {
                    result = a / b;
                }
                    break;
                }
                this.result[i] = result;
            } else{
                int jiechengnum = ra.nextInt(6);
                s[i] = jiechengnum + "!=";
                int jiechengResult=1;
                if (jiechengnum == 0) {
                    this.result[i] = 1;
                } else {
                    for (int o = 1; o <= jiechengnum; o++) {
                        jiechengResult = jiechengResult*o;
                    }
                    this.result[i]=jiechengResult;
                }
            }
        }

    }

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Test().setVisible(true);
            }
        });
    }

}