计应193第一组小学生做题软件——游晓

package operations_GUI;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

import operations.Oper;

public class Snippet {
    static JFrame jf = new JFrame();//主界面
    static JPanel pan1 = new JPanel();//主界面最上方面板
    static JPanel pan2 = new JPanel();//主界面中间面板
    static JPanel pan3 = new JPanel();//主界面最下方面板

    static String str = "";//存储表达式

    static JTextField[] jTextFields = new JTextField[10];//存放表达式的文本框的数组

    static int i = 0;//用于记录写了几道题，十题为一组

    static int right = 0;//用于记录写对几道题

    public static void main(String[] args) {
        jf.setSize(800, 600);
        jf.setLayout(new BorderLayout());
        jf.setLocationRelativeTo(null);

        pan1.setBackground(Color.WHITE);
        pan1.setSize(800, 150);
        pan1.setLayout(new FlowLayout());

        JTextField jtf = new JTextField(20);//用于存储表达式
        str = Oper.exercises();//将表达式赋值给str
        jtf.setText(str);
        jtf.setSize(400, 100);
        jtf.setEditable(false);
        jtf.setLocation(300, 25);
        jtf.setFont(new Font("微软雅黑", 1, 20));
        pan1.add(jtf);

        JTextField jtf_result = new JTextField(5);//用于输入计算结果
        jtf_result.setFont(new Font("微软雅黑", 1, 20));
        pan1.add(jtf_result);

        JButton jb = new JButton("下一题");//按钮，生成下一个表达式
        pan1.add(jb);

        pan2.setLayout(new GridLayout(5, 2));
        for (int i = 0; i < 10; i++) {
            jTextFields[i] = new JTextField();
            jTextFields[i].setFont(new Font("微软雅黑", 1, 20));//设置文本框字体
            jTextFields[i].setEditable(false);//设置文本框不可编辑
            pan2.add(jTextFields[i]);//循环生成文本框，并将文本框，并将文本框添加到中间面板中
        }

        JTextField jt = new JTextField(40);//用于显示做题结果的文本框
        jt.setFont(new Font("微软雅黑", 1, 15));
        jt.setEditable(false);//设置文本框不可编辑

        JButton reset = new JButton("再做一遍");//用于清空所有信息，重新做题

        pan3.add(jt);
        pan3.add(reset);

        jb.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                if (jtf_result.getText().equals("")) {
                    jTextFields[i].setText(str + jtf_result.getText() + "      × 正确结果为：" + Oper.res());
                } else if (Oper.res() == Double.parseDouble(jtf_result.getText())) {
                    jTextFields[i].setText(str + jtf_result.getText() + "      √");
                    right++;
                } else {
                    jTextFields[i].setText(str + jtf_result.getText() + "      × 正确结果为：" + Oper.res());
                }
                i++;
                str = Oper.exercises();
                jtf.setText(str);
                jtf_result.setText("");
                jtf_result.requestFocus();
                
                if (i == 10) {
                    jb.setEnabled(false);
                    jt.setText("你答对了" + right + "道题，答错了" + (10 - right) + "道题，正确率为：" + (right / 10.0));
                    if (right >= 8) {
                        JOptionPane.showMessageDialog(null, "恭喜你，答对了" + right + "道题");
                    }
                }
            }
        });

        reset.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                str = Oper.exercises();
                jtf.setText(str);
                for (int i = 0; i < 10; i++) {
                    jTextFields[i].setText("");
                }
                jt.setText("");
                i = 0;
                right = 0;
                jb.setEnabled(true);
            }
        });

        jf.add(pan1, BorderLayout.NORTH);
        jf.add(pan2, BorderLayout.CENTER);
        jf.add(pan3, BorderLayout.SOUTH);
        jf.setVisible(true);
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

package operations;

import java.text.DecimalFormat;
import java.util.Random;

public class Oper {
    static char[] cha = { '+', '-', '*', '/' };// 加减乘除数组

    static Random random = new Random();
    static double num1 = random.nextInt(100);
    static double num2 = random.nextInt(100);
    static char c = cha[random.nextInt(4)];

    public static String exercises() {
        num1 = random.nextInt(100);
        num2 = random.nextInt(100);
        c = cha[random.nextInt(4)];

        if (c == '/') {
            while (num2 == 0) {
                num2 = random.nextInt(100);
            }
            return (int) num1 + "" + c + "" + (int) num2 + "=";
        }

        return (int) num1 + "" + c + "" + (int) num2 + "=";
    }

    public static Double res() {
        double result = 0;
        switch (c) {
        case '+':
            result = num1 + num2;
            break;
        case '-':
            result = num1 - num2;
            break;
        case '*':
            result = num1 * num2;
            break;
        case '/':
            result = num1 / num2;
            break;

        default:
            break;
        }
        DecimalFormat df = new DecimalFormat("#.#");//除法运算小数位过多时保留一位小数
        result = Double.valueOf(df.format(result));// 转换为一位小数后表达式会转变成字符串，将其转变为double类型
        return result;
    }
}