四则运算1

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;
	Box box1, box2, box3, box4;
	String s = null, w = null, m = null;
	Container con;
	String fuhao = "";
	Choice c2;
	int count = 0;
	double temp;
	JTextArea area;

	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(300, 150);
		f.setLocation(100, 100);

		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("确定");
		cancel = new JButton("取消");
		button1 = new JButton("随机数1");

		button3 = new JButton("随机数2");
		box2.add(button1);

		box2.add(button3);
		box2.add(sub);
		sub.addActionListener(this);
		box2.add(cancel);

		box3 = Box.createVerticalBox();
		box3.add(Box.createVerticalStrut(20));
		box3.add(box1);
		box3.add(Box.createVerticalStrut(20));
		box3.add(box2);
		box3.add(Box.createVerticalStrut(10));
		con.add(box3);

		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);
			}
		});

		f.setVisible(true);
	}

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

	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, "计算正确");

				return;

			}
			if (temp < result) {
				JOptionPane.showMessageDialog(null, "计算错误");

				return;

			}

			if (temp > result) {
				JOptionPane.showMessageDialog(null, "计算错误");

				return;

			}

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

			temp = Integer.parseInt(last.getText());
			if (temp < result) {
				JOptionPane.showMessageDialog(null, "计算错误");

				return;
			}

			if (temp == result) {
				JOptionPane.showMessageDialog(null, "计算正确");

				return;
			}
			if (temp > result) {
				JOptionPane.showMessageDialog(null, "计算错误");

				return;
			}
		}
		if (fuhao.equals("*")) {
			result = s1 * s2;

			temp = Integer.parseInt(last.getText());
			if (temp == result) {
				JOptionPane.showMessageDialog(null, "计算正确");

				return;
			}
			if (temp < result) {
				JOptionPane.showMessageDialog(null, "计算错误");

				return;

			}
			if (temp > result) {
				JOptionPane.showMessageDialog(null, "计算错误");

				return;

			}

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

			temp = Integer.parseInt(last.getText());
			if (temp > result) {
				JOptionPane.showMessageDialog(null, "计算错误");

				return;
			}
			if (temp < result) {
				JOptionPane.showMessageDialog(null, "计算错误");

				return;

			}
			if (temp == result) {
				JOptionPane.showMessageDialog(null, "计算正确");

				return;

			}

		}
	}

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

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