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实验要求

编写一个算术测试的小软件，用来训练小学生的算术能力。程序由3个类组成，其中Teacher对象充当监视器，负责给出算术题目，并判断回答者的答案是否正确，


ComputerFrame对象负责为算术题目提供视图，比如用户可以通过


ComputerFrame对象提供的GUI界面看到题目，并通过该GUI界面给出题目的答案，

MainClass

是软件主类。

代码

MainClass.java

public class MainClass {

	public static void main(String[] args) {
		ComputerFrame frame;
		frame = new ComputerFrame();
		frame.setTitle("算数测试");
		frame.setBounds(100, 100, 650, 180);
	}

}

ComputerFrame.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ComputerFrame extends JFrame {
	JMenuBar menubar;
	JMenu choiceGrade;
	JMenuItem grade1, grade2;
	JTextField textOne, textTwo, textResult;
	JButton getProblem, giveAnswer;
	JLabel operatorLabel, message;
	Teacher teacherzhang;

	ComputerFrame() {
		teacherzhang = new Teacher();
		teacherzhang.setMaxInteger(20);
		setLayout(new FlowLayout());
		menubar = new JMenuBar();
		choiceGrade = new JMenu("选择级别");
		grade1 = new JMenuItem("幼儿级别");
		grade2 = new JMenuItem("儿童级别");
		grade1.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				teacherzhang.setMaxInteger(10);
			}
		});
		grade2.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				teacherzhang.setMaxInteger(50);
			}
		});
		choiceGrade.add(grade1);
		choiceGrade.add(grade2);
		menubar.add(choiceGrade);
		setJMenuBar(menubar);
		textOne = new JTextField(5);
		textTwo = new JTextField(5);
		textResult = new JTextField(5);
		operatorLabel = new JLabel("+");
		operatorLabel.setFont(new Font("Arial", Font.BOLD, 20));
		message = new JLabel("你还没有回答");
		getProblem = new JButton("获取题目");
		giveAnswer = new JButton("确认答案");
		add(textOne);
		add(operatorLabel);
		add(textTwo);
		add(new JLabel("="));
		add(textResult);
		add(giveAnswer);
		add(message);
		add(getProblem);
		textResult.requestFocus();
		textOne.setEditable(false);
		textTwo.setEditable(false);
		getProblem.setActionCommand("getProblem");
		textResult.setActionCommand("answer");
		giveAnswer.setActionCommand("answer");
		teacherzhang.setJTextField(textOne, textTwo, textResult);
		teacherzhang.setJLabel(operatorLabel, message);
		getProblem.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				teacherzhang.actionPerformed(e);
			}
		});
		giveAnswer.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				teacherzhang.actionPerformed(e);
			}
		});
		textResult.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				teacherzhang.actionPerformed(e);
			}
		});
		setVisible(true);
		validate();
		setDefaultCloseOperation(DISPOSE_ON_CLOSE);
	}

}

Teacher.java

import java.awt.*;
import java.awt.event.*;
import java.util.Random;

import javax.swing.*;

public class Teacher {
	int numberOne, numberTwo;
	String operator = "";
	boolean isRight;
	Random random;
	int maxInteger;
	JTextField textOne, textTwo, textResult;
	JLabel operatorLabel, message;

	Teacher() {
		random = new Random();
	}

	public void setMaxInteger(int n) {
		maxInteger = n;
	}

	public void actionPerformed(ActionEvent e) {
		String str = e.getActionCommand();
		if (str.equals("getProblem")) {
			numberOne = random.nextInt(maxInteger) + 1;
			numberTwo = random.nextInt(maxInteger) + 1;
			double d = Math.random();
			if (d >= 0.5)
				operator = "+";
			else
				operator = "-";
			textOne.setText("" + numberOne);
			textTwo.setText("" + numberTwo);
			operatorLabel.setText(operator);
			message.setText("请回答");
			textResult.setText(null);
		} else if (str.equals("answer")) {
			String answer = textResult.getText();
			try {
				int result = Integer.parseInt(answer);
				if (operator.equals("+")) {
					if (result == numberOne + numberTwo)
						message.setText("你的回答正确");
					else
						message.setText("你的回答错误");
				} else if (operator.equals("-")) {
					if (result == numberOne - numberTwo)
						message.setText("你的回答正确");
					else
						message.setText("你的回答错误");
				}
			} catch (NumberFormatException ex) {
				message.setText("请输入数字字符");
			}
		}
	}

	public void setJTextField(JTextField... t) {
		textOne = t[0];
		textTwo = t[1];
		textResult = t[2];
	}

	public void setJLabel(JLabel... label) {
		operatorLabel = label[0];
		message = label[1];
	}
}

运算结果