杨玲 201771010133《面向对象程序设计（java）》第十八周学习总结

 《面向对象程序设计（java）》第十八周学习总结

第一部分：理论知识学习部分

第二部分：实验部分

实验名称：实验十八  总复习

1、实验目的与要求

(1) 综合掌握java基本程序结构；

(2) 综合掌握java面向对象程序设计特点；

(3) 综合掌握java GUI 程序设计结构；

(4) 综合掌握java多线程编程模型；

(5) 综合编程练习。

2、实验内容和步骤

任务1：填写课程课后调查问卷，网址：https://www.wjx.cn/jq/33108969.aspx。

任务2：综合编程练习

练习1：设计一个用户信息采集程序，要求如下：

（1） 用户信息输入界面如下图所示:

（1）用户点击提交按钮时，用户输入信息显示控制台界面；

（2）用户点击重置按钮后，清空用户已输入信息；

（3）点击窗口关闭，程序退出。

2 
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;

import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;

public class DemoJFrame extends JFrame {
    private JPanel jPanel1;
    private JPanel jPanel2;
    private JPanel jPanel3;
    private JPanel jPanel4;
    private JTextField fieldname;
    private JComboBox comboBox;
    private JTextField fieldadress;
    private ButtonGroup bg;
    private JRadioButton Male;
    private JRadioButton Female;
    private JCheckBox read;
    private JCheckBox sing;
    private JCheckBox dance;

    public DemoJFrame() {
        // 设置窗口大小
        this.setSize(800, 400);
        // 设置可见性
        this.setVisible(true);
        // 设置标题
        this.setTitle("编程练习一");
        // 设置关闭操作
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        // 设置窗口居中
        WinCenter.center(this);
        // 创建四个面板对象
        jPanel1 = new JPanel();
        setJPanel1(jPanel1);                
        jPanel2 = new JPanel();
        setJPanel2(jPanel2);
        jPanel3 = new JPanel();
        setJPanel3(jPanel3);
        jPanel4 = new JPanel();
        setJPanel4(jPanel4);
        // 设置容器的为流布局
        FlowLayout flowLayout = new FlowLayout();
        this.setLayout(flowLayout);
        // 将四个面板添加到容器中
        this.add(jPanel1);
        this.add(jPanel2);
        this.add(jPanel3);
        this.add(jPanel4);

    }

    /*
     * 设置面一
     */
    private void setJPanel1(JPanel jPanel) {
        // TODO 自动生成的方法存根
        jPanel.setPreferredSize(new Dimension(700, 45));
        // 给面板的布局设置为网格布局 一行4列
        jPanel.setLayout(new GridLayout(1, 4));
        
        JLabel name = new JLabel("name:");
        name.setSize(100, 50);
        fieldname = new JTextField("");
        fieldname.setSize(80, 20);
        
        JLabel study = new JLabel("qualification:");
        comboBox = new JComboBox();
        comboBox.addItem("初中");
        comboBox.addItem("高中");
        comboBox.addItem("本科");
        jPanel.add(name);
        jPanel.add(fieldname);
        jPanel.add(study);
        jPanel.add(comboBox);

    }

    /*
     * 设置面板二
     */
    private void setJPanel2(JPanel jPanel) {
        // TODO 自动生成的方法存根
        jPanel.setPreferredSize(new Dimension(700, 50));
        // 给面板的布局设置为网格布局 一行4列
        jPanel.setLayout(new GridLayout(1, 4));
        
        JLabel name = new JLabel("address:");
        fieldadress = new JTextField();
        fieldadress.setPreferredSize(new Dimension(150, 50));
        
        JLabel study = new JLabel("hobby:");
        JPanel selectBox = new JPanel();
        selectBox.setBorder(BorderFactory.createTitledBorder(""));
        selectBox.setLayout(new GridLayout(3, 1));
        read = new JCheckBox("reading");
        sing = new JCheckBox("singing");
        dance = new JCheckBox("danceing");
        selectBox.add(read);
        selectBox.add(sing);
        selectBox.add(dance);
        jPanel.add(name);
        jPanel.add(fieldadress);
        jPanel.add(study);
        jPanel.add(selectBox);
    }

    /*
     * 设置面板三
     */
    private void setJPanel3(JPanel jPanel) {
        // TODO 自动生成的方法存根
        jPanel.setPreferredSize(new Dimension(700, 150));
        FlowLayout flowLayout = new FlowLayout(FlowLayout.LEFT);
        jPanel.setLayout(flowLayout);
        JLabel sex = new JLabel("性别:");
        JPanel selectBox = new JPanel();
        selectBox.setBorder(BorderFactory.createTitledBorder(""));
        selectBox.setLayout(new GridLayout(2, 1));
        bg = new ButtonGroup();
        Male = new JRadioButton("male");
        Female = new JRadioButton("female");
        bg.add(Male );
        bg.add(Female);
        selectBox.add(Male);
        selectBox.add(Female);
        jPanel.add(sex);
        jPanel.add(selectBox);

    }

    /*
     * 设置面板四
     */
    private void setJPanel4(JPanel jPanel) {
        // TODO 自动生成的方法存根
        jPanel.setPreferredSize(new Dimension(700, 150));
        FlowLayout flowLayout = new FlowLayout(FlowLayout.CENTER, 50, 10);
        jPanel.setLayout(flowLayout);
        jPanel.setLayout(flowLayout);
        JButton sublite = new JButton("提交");
        JButton reset = new JButton("重置");
        sublite.addActionListener((e) -> valiData());
        reset.addActionListener((e) -> Reset());
        jPanel.add(sublite);
        jPanel.add(reset);
    }

    /*
     * 提交数据
     */
    private void valiData() {
        // TODO 自动生成的方法存根
        // 拿到数据
        String name = fieldname.getText().toString().trim();
        String xueli = comboBox.getSelectedItem().toString().trim();
        String address = fieldadress.getText().toString().trim();
        System.out.println(name);
        System.out.println(xueli);
        String hobbystring="";
        if (read.isSelected()) {
            hobbystring+="reading   ";
        }
        if (sing.isSelected()) {
            hobbystring+="singing   ";
        }
        if (dance.isSelected()) {
            hobbystring+="dancing  ";
        }
        System.out.println(address);
        if (Male.isSelected()) {
            System.out.println("male");
        }
        if (Female.isSelected()) {
            System.out.println("female");
        }
        System.out.println(hobbystring);
    }

    /*
     * 重置
     */
    private void Reset() {
        // TODO 自动生成的方法存根
        fieldadress.setText(null);
        fieldname.setText(null);
        comboBox.setSelectedIndex(0);
        read.setSelected(false);
        sing.setSelected(false);
        dance.setSelected(false);
        bg.clearSelection();
    }
}

 DemoJFrame

2 


import java.awt.EventQueue;

import javax.swing.JFrame;

public class Main {
    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            DemoJFrame page = new DemoJFrame();
        });
    }
}

Main

2 
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.Window;

public class WinCenter {
    public static void center(Window win){
        Toolkit tkit = Toolkit.getDefaultToolkit();
        Dimension sSize = tkit.getScreenSize();
        Dimension wSize = win.getSize();
        if(wSize.height > sSize.height){
            wSize.height = sSize.height;
        }
        if(wSize.width > sSize.width){
            wSize.width = sSize.width;
        }
        win.setLocation((sSize.width - wSize.width)/ 2, (sSize.height - wSize.height)/ 2);
    }
}

 WinCenter

运行结果如下：

练习2：采用GUI界面设计以下程序：

l 编制一个程序，将身份证号.txt 中的信息读入到内存中；

l 按姓名字典序输出人员信息；

l 查询最大年龄的人员信息；

l 查询最小年龄人员信息；

l 输入你的年龄，查询身份证号.txt中年龄与你最近人的姓名、身份证号、年龄、性别和出生地；

l 查询人员中是否有你的同乡。

l 输入身份证信息，查询所提供身份证号的人员信息，要求输入一个身份证数字时，查询界面就显示满足查询条件的查询结果，且随着输入的数字的增多，查询匹配的范围逐渐缩小。

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class Main extends JFrame {
    private static ArrayList<Student> studentlist;
    private static ArrayList<Student> list;
    private JPanel panel;
    private JPanel buttonPanel;
    private static final int DEFAULT_WITH = 800;
    private static final int DEFAULT_HEIGHT = 600;

    public Main() {
        studentlist = new ArrayList<>();
        Scanner scanner = new Scanner(System.in);
        File file = new File("E:\java\身份证号.txt");
        try {
            FileInputStream fis = new FileInputStream(file);
            BufferedReader in = new BufferedReader(new InputStreamReader(fis));
            String temp = null;
            while ((temp = in.readLine()) != null) {

                Scanner linescanner = new Scanner(temp);

                linescanner.useDelimiter(" ");
                String name = linescanner.next();
                String number = linescanner.next();
                String sex = linescanner.next();
                String age = linescanner.next();
                String province = linescanner.nextLine();
                Student student = new Student();
                student.setName(name);
                student.setnumber(number);
                student.setsex(sex);
                int a = Integer.parseInt(age);
                student.setage(a);
                student.setprovince(province);
                studentlist.add(student);

            }
        } catch (FileNotFoundException e) {
            System.out.println("学生信息文件找不到");
            e.printStackTrace();
        } catch (IOException e) {
            System.out.println("学生信息文件读取错误");
            e.printStackTrace();
        }
        panel = new JPanel();
        panel.setLayout(new BorderLayout());
        JTextArea jt = new JTextArea();
        panel.add(jt);
        add(panel, BorderLayout.NORTH);
        buttonPanel = new JPanel();
        buttonPanel.setLayout(new GridLayout(1, 7));
        JButton jButton = new JButton("字典排序");
        JButton jButton1 = new JButton("年龄最大和年龄最小");
        JLabel lab = new JLabel("猜猜你的老乡");
        JTextField jt1 = new JTextField();
        JLabel lab1 = new JLabel("找找同龄人（年龄相近）：");
        JTextField jt2 = new JTextField();
        JLabel lab2 = new JLabel("输入你的身份证号码：");
        JTextField jt3 = new JTextField();
        JButton jButton2 = new JButton("退出");
        jButton.setBounds(110, 90, 60, 30);
        jButton1.setBounds(110, 90, 60, 30);
        jt1.setBounds(110, 90, 60, 30);
        jt2.setBounds(110, 90, 60, 30);
        jt3.setBounds(110, 90, 60, 30);
        jButton2.setBounds(110, 90, 60, 30);
        jButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                Collections.sort(studentlist);
                jt.setText(studentlist.toString());
            }
        });
        jButton1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int max = 0, min = 100;
                int j, k1 = 0, k2 = 0;
                for (int i = 1; i < studentlist.size(); i++) {
                    j = studentlist.get(i).getage();
                    if (j > max) {
                        max = j;
                        k1 = i;
                    }
                    if (j < min) {
                        min = j;
                        k2 = i;
                    }

                }
                jt.setText("年龄最大：" + studentlist.get(k1) + "年龄最小：" + studentlist.get(k2));
            }
        });
        jButton2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                dispose();
                System.exit(0);
            }
        });
        jt1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String find = jt1.getText();
                String text="";
                String place = find.substring(0, 3);
                for (int i = 0; i < studentlist.size(); i++) {
                    if (studentlist.get(i).getprovince().substring(1, 4).equals(place)) {
                        text+="
"+studentlist.get(i);
                        jt.setText("老乡：" + text);
                    }
                }
            }
        });
        jt2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String yourage = jt2.getText();
                int a = Integer.parseInt(yourage);
                int near = agenear(a);
                int value = a - studentlist.get(near).getage();
                jt.setText("年龄相近：" + studentlist.get(near));
            }
        });
        jt3.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                list = new ArrayList<>();
                Collections.sort(studentlist);
                String key = jt3.getText();
                for (int i = 1; i < studentlist.size(); i++) {
                    if (studentlist.get(i).getnumber().contains(key)) {                        
                        list.add(studentlist.get(i));                        
                        jt.setText("emmm！你可能是：
" + list);
                    
                    }                    
                }
            }
        });
        buttonPanel.add(jButton);
        buttonPanel.add(jButton1);
        buttonPanel.add(lab);
        buttonPanel.add(jt1);
        buttonPanel.add(lab1);
        buttonPanel.add(jt2);
        buttonPanel.add(lab2);
        buttonPanel.add(jt3);
        buttonPanel.add(jButton2);
        add(buttonPanel, BorderLayout.SOUTH);
        setSize(DEFAULT_WITH, DEFAULT_HEIGHT);
    }

    public static int agenear(int age) {
        int min = 53, value = 0, k = 0;
        for (int i = 0; i < studentlist.size(); i++) {
            value = studentlist.get(i).getage() - age;
            if (value < 0)
                value = -value;
            if (value < min) {
                min = value;
                k = i;
            }
        }
        return k;
    }

}

public class Student implements Comparable<Student> {

    private String name;
    private String number ;
    private String sex ;
    private int age;
    private String province;
   
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getnumber() {
        return number;
    }
    public void setnumber(String number) {
        this.number = number;
    }
    public String getsex() {
        return sex ;
    }
    public void setsex(String sex ) {
        this.sex =sex ;
    }
    public int getage() {

        return age;
        }
        public void setage(int age) {
            // int a = Integer.parseInt(age);
        this.age= age;
        }

    public String getprovince() {
        return province;
    }
    public void setprovince(String province) {
        this.province=province ;
    }

    public int compareTo(Student o) {
       return this.name.compareTo(o.getName());
    }

    public String toString() {
        return  name+"	"+sex+"	"+age+"	"+number+"	"+province+"
";
    }    
}

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

public class ButtonTest {
    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            JFrame frame = new Main();
            frame.setTitle("身份证信息");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
        });
    }
}

运行结果如下：

练习3：采用GUI界面设计以下程序

l 编写一个计算器类，可以完成加、减、乘、除的操作

l 利用计算机类，设计一个小学生100以内数的四则运算练习程序，由计算机随机产生10道加减乘除练习题，学生输入答案，由程序检查答案是否正确，每道题正确计10分，错误不计分，10道题测试结束后给出测试总分；

l 将程序中测试练习题及学生答题结果输出到文件，文件名为test.txt。

import java.awt.BorderLayout;
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.JPanel;
import javax.swing.JTextField;
public class Calculator extends JFrame {
JButton b0 = new JButton("0");
JButton b1 = new JButton("1");
JButton b2 = new JButton("2");
JButton b3 = new JButton("3");
JButton b4 = new JButton("4");
JButton b5 = new JButton("5");
JButton b6 = new JButton("6");
JButton b7 = new JButton("7");
JButton b8 = new JButton("8");
JButton b9 = new JButton("9");
JButton jiaButton = new JButton("+");
JButton jianButton = new JButton("-");
JButton chengButton = new JButton("*");
JButton chuButton = new JButton("/");
JButton yuButton = new JButton("%");
JButton jjButton = new JButton("+/-");
JButton sqrtButton = new JButton("sqrt");
JButton dianButton = new JButton(".");
JButton dengButton = new JButton("=");
JButton daoButton = new JButton("1/x");
JButton backButton = new JButton("Backpace");
JButton cButton = new JButton("C");
public double op1;
public double op2;
public static final int JIA = 0;
public static final int JIAN = 1;
public static final int CHENG = 2;
public static final int CHU = 3;
public static final int JJ = 4;
public static final int DIAN = 5;
public int current0p = 0;
private boolean opEnd = false;
JPanel panel1 = new JPanel();
JPanel panel2 = new JPanel();
JPanel panel3 = new JPanel();
JPanel panel4 = new JPanel();
JTextField result = new JTextField(20);
public Calculator() {
initPanel2();
initPanel3();
panel2.setLayout(new GridLayout(5, 4));
panel1.setLayout(new BorderLayout());
panel1.add(panel3, BorderLayout.NORTH);// 设置位置
panel1.add(panel2, BorderLayout.CENTER);// 设置位置
getContentPane().add(panel1);
addActionListeners();
setSize(260, 260);
setLocation(500, 300);
setVisible(true);
setDefaultCloseOperation(Calculator.EXIT_ON_CLOSE);
this.setResizable(false);
this.setTitle("计算器");
}
private void initPanel2() {
// 把组件添加相应panel上
panel2.add(b7);
panel2.add(b8);
panel2.add(b9);
panel2.add(chuButton);
panel2.add(b4);
panel2.add(b5);
panel2.add(b6);
panel2.add(chengButton);
panel2.add(b1);
panel2.add(b2);
panel2.add(b3);
panel2.add(jianButton);
panel2.add(b0);
panel2.add(jjButton);
panel2.add(dianButton);
panel2.add(jiaButton);
panel2.add(daoButton);
panel2.add(yuButton);
panel2.add(sqrtButton);
panel2.add(dengButton);
}
private void addActionListeners() {
ActionHandler c = new ActionHandler();
b0.addActionListener(c);
b1.addActionListener(c);
b2.addActionListener(c);
b3.addActionListener(c);
b4.addActionListener(c);
b5.addActionListener(c);
b6.addActionListener(c);
b7.addActionListener(c);
b8.addActionListener(c);
b9.addActionListener(c);
jiaButton.addActionListener(c);
dengButton.addActionListener(c);
chengButton.addActionListener(c);
chuButton.addActionListener(c);
jianButton.addActionListener(c);
jjButton.addActionListener(c);
dianButton.addActionListener(c);
sqrtButton.addActionListener(c);
yuButton.addActionListener(c);
daoButton.addActionListener(c);
backButton.addActionListener(c);
cButton.addActionListener(c);
}
class ActionHandler implements ActionListener {
public void actionPerformed(ActionEvent e) {
if (e.getSource() == b0) {
if (opEnd == false) {
result.setText("");
}
result.setText(result.getText() + "0");
}
if (e.getSource() == b1) {
if (opEnd == false) {
result.setText("");
}
result.setText(result.getText() + "1");
opEnd = true;
}
if (e.getSource() == b2) {
if (opEnd == false) {
result.setText("");
}
result.setText(result.getText() + "2");
opEnd = true;
}
if (e.getSource() == b3) {
if (opEnd == false) {
result.setText("");
}
result.setText(result.getText() + "3");
opEnd = true;
}
if (e.getSource() == b4) {
if (opEnd == false) {
result.setText("");
}
result.setText(result.getText() + "4");
opEnd = true;
}
if (e.getSource() == b5) {
if (opEnd == false) {
result.setText("");
}
result.setText(result.getText() + "5");
opEnd = true;
}
if (e.getSource() == b6) {
if (opEnd == false) {
result.setText("");
}
result.setText(result.getText() + "6");
opEnd = true;
}
if (e.getSource() == b7) {
if (opEnd == false) {
result.setText("");
}
result.setText(result.getText() + "7");
opEnd = true;
}
if (e.getSource() == b8) {
if (opEnd == false) {
result.setText("");
}
result.setText(result.getText() + "8");
opEnd = true;
}
if (e.getSource() == b9) {
if (opEnd == false) {
result.setText("");
}
result.setText(result.getText() + "9");
opEnd = true;
}
try {
if (e.getSource() == jiaButton) {
op1 = Double.parseDouble(result.getText());
// 2、说明操作数已经输入完毕
opEnd = false;
current0p = JIA;
}
if (e.getSource() == chengButton) {
op1 = Double.parseDouble(result.getText());
// 2、说明操作数已经输入完毕
opEnd = false;
current0p = CHENG;
}
if (e.getSource() == chuButton) {
op1 = Double.parseDouble(result.getText());
// 2、说明操作数已经输入完毕
opEnd = false;
current0p = CHU;
}
if (e.getSource() == jianButton) {
op1 = Double.parseDouble(result.getText());
// 2、说明操作数已经输入完毕
opEnd = false;
current0p = JIAN;
}
if (e.getSource() == jjButton) {
String tmp = result.getText();
if (tmp.equals("") || tmp.equals("0")) {
return;
}
if (tmp.charAt(0) == '-') {
tmp = tmp.substring(1);
} else {
tmp = '-' + tmp;
}
result.setText(tmp);
}
if (e.getSource() == dianButton) {
String tmp = result.getText();
if (tmp.equals("")) {
return;
}
if (tmp.indexOf(".") != -1) {
return;
}
tmp = tmp + ".";
result.setText(tmp);
}
if (e.getSource() == sqrtButton) {
String tmp = result.getText();
if (tmp.equals(" ")) {
return;
}
double d;
d = Double.parseDouble(tmp);// 先定义double类型d
if (d < 0) {
result.setText("不能对负数求平方根");
return;
}
op2 = Math.sqrt(d);
result.setText(op2 + "");
}
if (e.getSource() == backButton) {
String s = result.getText();
result.setText("");
for (int i = 0; i < s.length() - 1; i++) {
char a = s.charAt(i);
result.setText(result.getText() + a);
}
}
if (e.getSource() == cButton) {
result.setText("0");
opEnd = false;
}
if (e.getSource() == dengButton) {
op2 = Double.parseDouble(result.getText());
switch (current0p) {
case JIA:
result.setText(op1 + op2 + "");
break;
case JIAN:
result.setText(op1 - op2 + "");
break;
case CHENG:
result.setText(op1 * op2 + "");
break;
case CHU:
if (op2 == 0) {
result.setText("被除数不能为零");
break;
}
result.setText(op1 / op2 + "");
break;
}
opEnd = false;
}
} catch (Exception e1) {
result.setText("Wrong");
opEnd = false;
}
}
}
private void initPanel3() {
panel3.setLayout(new GridLayout(2, 1));
panel3.add(result);
panel3.add(panel4);
panel4.setLayout(new GridLayout(1, 2));
panel4.add(backButton);
panel4.add(cButton);
}
public static void main(String[] args) {
Calculator c = new Calculator();// 生成类实例
}
}

import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.Scanner;

/*
 * 该程序用来随机生成0到100以内的加减乘除题
 */
public class Demo {
    public static  void main(String[] args) {
        // 用户的答案要从键盘输入，因此需要一个键盘输入流
        Scanner in = new Scanner(System.in);
        Counter counter=new Counter();
        PrintWriter out = null;
        try {
            out = new PrintWriter("text.txt");
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        // 定义一个变量用来统计得分
        int sum = 0;
        int k=0;
        // 通过循环生成10道题
        for (int i = 0; i < 10; i++) {

            // 随机生成两个100以内的随机数作加减乘除
            int a = (int) Math.round(Math.random() * 100);
            int b = (int) Math.round(Math.random() * 100);
            int d = (int) Math.round(Math.random() * 3);
            
            switch (d){
            
            case 0: 
              if(a%b == 0) {
              System.out.println(a + "/" + b + "=");
              break;
              }
              //int c = in.nextInt();
              //out.println(a + "/" + b + "="+c);
            case 1:
              System.out.println(a + "*" + b + "=");
              //int c1 = in.nextInt();
              //out.println(a + "*" + b + "="+c1);
              break;
            case 2:
              System.out.println(a + "+" + b + "=");
              //int c2 = in.nextInt();
              //out.println(a + "+" + b + "="+c2);
              break;
            case 3:
            if(a>b) {
            System.out.println(a + "-" + b + "=");
            break;
            }
            //int c3 = in.nextInt();
            //out.println(a + "-" + b + "="+c3);
            
            }        

            // 定义一个整数用来接收用户输入的答案
            double c = in.nextDouble();
            
            // 判断用户输入的答案是否正确，正确给10分，错误不给分
            if (c == a / b | c == a * b | c == a + b | c == a - b) {
                sum += 10;
                System.out.println("恭喜答案正确");
            }
            else {
                System.out.println("抱歉，答案错误");
            
            }
            out.println(a + "/" + b + "="+c );
            out.println(a + "*" + b + "="+c);
            out.println(a + "+" + b + "="+c);
            out.println(a + "-" + b + "="+c);
        
        }
        //输出用户的成绩
        System.out.println("你的得分为"+sum);
        
        out.println("成绩:"+sum);
        out.close();
    }
    }

运行结果如下：

任务3：本学期课程已结束，请汇总《面向对象程序设计课程学习进度条》的数据，统计个人专业能力提升的数据。并从学习内容、学习方法、学习心得几个方面进行课程学习总结，也希望你对课程的不足提出建议和意见。

4. 实验总结：

　　通过本学期的实验课程学习，真的学到了很多，尤其是在老师和助教学长的耐心指导下，从最开始JDK的安装到后来自己能写出可以运行的程序，很开心。这并不是结束，而是另一个新的开始，我会继续努力，学习更多。