四则运算升级版

• 题目：生成小学四则运算题目的 “软件”。 让程序能接受用户输入答案，并判定对错。 最后给出总共 对/错 的数量。

• 需求分析

  1. 能自动生成加、减、乘、除四则运算式子，并在窗口中显现出来。
  2. 判断输入的答案是否正确，并给出正确答案。
  3. 能统计出一共做对和做错多少道题目。
  • 设计思路
  1. 做一个便于操作的界面，其中有两个随机按钮，用于给出随机数，有一个确定按钮，用于判断正误，并给出正确答案，和统计对错的个数。有一个取消按钮，用于取消输入的答案。一个符号按钮，由于选择加、减、乘、除。
  2. 做题时，只需点击两个随机按钮，一个选择按钮，输入答案，按确定键即可。
• 代码与运行结果如下

import java.awt.*;


import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import java.util.Random;
import java.util.Scanner;

import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class sizeyunsuan implements ActionListener, ItemListener {
	JFrame f;
	JTextField first, second, third, last;
	JButton sub, cancel, button1, button2, button3, fourth, denyu;
	Box box1, box2, box3, box4;
	String s = null, w = null, m = null;
	Container con;
	String fuhao = "";
	Choice c2;
	int count = 0 ,count1=0;
	double temp;
	JTextArea textShow;

	public sizeyunsuan() {
		f = new JFrame();
		f.setTitle("欢迎进入王铭霞制作的四则运算测试");
		f.setSize(370, 320);
		f.setLocation(200, 200);

		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		con = f.getContentPane();

		box1 = Box.createHorizontalBox();

		first = new JTextField(5);
		c2 = new Choice();
		c2.addItemListener(this);
		c2.add("");
		c2.add("+");
		c2.add("-");
		c2.add("*");
		c2.add("/");
		third = new JTextField(5);
		fourth = new JButton("=");
        
		last = new JTextField(7);
		box1.add(first);
		box1.add(c2);
		box1.add(third);
		box1.add(fourth);
		box1.add(last);
		
		box2 = Box.createHorizontalBox();
		sub = new JButton("confirm");
		cancel = new JButton("cancel");
		button1 = new JButton("random1");
		button3 = new JButton("ramdom2");
		box2.add(button1);
		box2.add(Box.createHorizontalStrut(10));
		box2.add(button3);
		box2.add(Box.createHorizontalStrut(10));
		box2.add(sub);
		box2.add(Box.createHorizontalStrut(10));	
		box2.add(cancel);
		sub.addActionListener(this);
		box3=Box.createHorizontalBox();
		textShow=new JTextArea (150,100);
		box3.add(textShow);
		
		
		box4 = Box.createVerticalBox();
		box4.add(Box.createVerticalStrut(20));
		box4.add(box1);
		box4.add(Box.createVerticalStrut(20));
		box4.add(box3);
		box4.add(Box.createVerticalStrut(20));
		box4.add(box2);
		box4.add(Box.createVerticalStrut(10));
		con.add(box4);

		button1.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				s = String.valueOf(Math.round((Math.random() * 100)));
				first.setText(s);
			}
		});

		button3.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				w = String.valueOf(Math.round((Math.random() * 100) + 1));
				third.setText(w);
			}
		});
		cancel.addActionListener(new ActionListener(){

			@Override
			public void actionPerformed(ActionEvent e) {
				if(e.getSource() ==cancel ) 
					last.setText(null);
				
			}
			
		});

		f.setVisible(true);
	}

	public static void main(String arg[]) {
		sizeyunsuan w = new sizeyunsuan();
	}

	@Override
	public void actionPerformed(ActionEvent e) {
		double s1 = Integer.parseInt(first.getText());
		double s2 = Integer.parseInt(third.getText());
		double result = 0;
		if (fuhao.equals("+")) {
			result = s1 + s2;
			temp = Integer.parseInt(last.getText());
			if (temp == result) {
				JOptionPane.showMessageDialog(null, "congradulation");
				count=count+1;

			}
			if (temp != result) {
				JOptionPane.showMessageDialog(null, "sorry");
				count1=count1+1;

			}


		}
		else if (fuhao.equals("-")) {
			result = s1 - s2;

			temp = Integer.parseInt(last.getText());
			if (temp != result) {
				JOptionPane.showMessageDialog(null, "sorry");
				count1=count1+1;
			}

			if (temp == result) {
				JOptionPane.showMessageDialog(null, "congradulation");
				count=count+1;
		
			}	
		}
		else if (fuhao.equals("*")) {
			result = s1 * s2;
         
			temp = Integer.parseInt(last.getText());
			if (temp == result) {
				JOptionPane.showMessageDialog(null, "congradulation");
				count=count+1;
				
			}
			if (temp != result) {
				JOptionPane.showMessageDialog(null, "sorry");
				count1=count1+1;
				

			}
		}
		else if (fuhao.equals("/")) {
			result = s1 / s2;

			temp = Integer.parseInt(last.getText());
			if (temp != result) {
				JOptionPane.showMessageDialog(null, "sorry");
				count1=count1+1;
			
			}
			if (temp == result) {
				JOptionPane.showMessageDialog(null, "congradulation");
				count=count+1;
				

			}

		}
		textShow.append(s1+""+fuhao+""+s2+"="+result+"
");
		textShow.append("right"+count+"
");
		textShow.append("wrong"+count1+"
");
	}

	public void itemStateChanged(ItemEvent ie) {
		if (ie.getSource() == c2) {
			String str1 = c2.getSelectedItem();
			fanhui(str1);
		}
	}

	public String fanhui(String str2) {
		return fuhao = str2;
	}
}