20192307 2020-2021-1 《数据结构与面向对象程序设计》实验三报告
20192307 2020-2021-1 《数据结构与面向对象程序设计》实验三报告
- 课程：《数据结构与面向对象程序设计》
- 班级： 1923
- 姓名： 常万里
- 学号： 20192307
- 实验教师：王志强老师
- 实验日期：2020年10月8日
- 必修/选修： 必修
一、实验内容
下载安装并使用IDEA，完成下面实验（https://www.cnblogs.com/rocedu/p/6371315.html）
- 初步掌握单元测试和TDD；
- 理解并掌握面向对象三要素：封装、继承、多态；
- 初步掌握UML建模；
- 完成蓝墨云上 （1）-（5）实验。
二、实验过程及结果
（一）Myutil及MyutilTest的编写
产品代码
package NBE3;
public class MyUtil {
public static String percentage2fivegrade(int grade) {
//如果成绩小于0，转成“错误”
if ((grade < 0)) {
return "错误";
}
//如果成绩小于60，转成“不及格”
else if (grade < 60) {
return "不及格";
}
//如果成绩在60与70之间，转成“及格”
else if (grade < 70) {
return "及格";
}
//如果成绩在70与80之间，转成“中等”
else if (grade < 80) {
return "中等";
}
//如果成绩在80与90之间，转成“良好”
else if (grade < 90) {
return "良好";
}
//如果成绩在90与100之间，转成“优秀”
else if (grade <= 100) {
return "优秀";
}
//如果成绩大于100，转成“错误”
else {
return "错误";
}
}
}
测试代码
package NBE3;
import junit.framework.TestCase;
import org.testng.annotations.Test;
public class MyUtilTest extends TestCase {
@Test
public void testNormal() {
assertEquals("不及格", MyUtil.percentage2fivegrade(55));
assertEquals("及格", MyUtil.percentage2fivegrade(65));
assertEquals("中等", MyUtil.percentage2fivegrade(75));
assertEquals("良好", MyUtil.percentage2fivegrade(85));
assertEquals("优秀", MyUtil.percentage2fivegrade(95));
}
@Test
public void testExceptions() {
assertEquals("不及格", MyUtil.percentage2fivegrade(55));
assertEquals("不及格", MyUtil.percentage2fivegrade(55));
}
@Test
public void testBoundary() {
assertEquals("不及格", MyUtil.percentage2fivegrade(0));
assertEquals("及格", MyUtil.percentage2fivegrade(60));
assertEquals("中等", MyUtil.percentage2fivegrade(70));
assertEquals("良好", MyUtil.percentage2fivegrade(80));
assertEquals("优秀", MyUtil.percentage2fivegrade(90));
assertEquals("优秀", MyUtil.percentage2fivegrade(100));
}
}
运行结果截图
（二）StringBuffer及StringBufferTest的编写
产品代码
package NBE5;
/**
* \* Created with IntelliJ IDEA.
* \* User: Shape Of My Heart
* \* Date: 2020/10/8
* \* Time: 15:43
* \* Besides,some of the best things in life are total mistakes.
* \* Description:
* \
**/
public class StringBufferDemo {
public static void main(String args[]) {
StringBuffer buffer = new StringBuffer();
buffer.append('S');
buffer.append("tringBuffer");
System.out.println(buffer.charAt(1));
System.out.println(buffer.capacity());
System.out.println(buffer.indexOf("tring"));
System.out.println("buffer = " + buffer.toString());
}
}
测试代码
package NBE5;
import junit.framework.TestCase;
import org.testng.annotations.Test;
public class StringBufferDemoTest extends TestCase {
StringBuffer a = new StringBuffer("StringBuffer");
StringBuffer b = new StringBuffer("StringBufferStringBuffer");
StringBuffer c = new StringBuffer("StringBufferStringBufferStringBuffer");
@Test
public void testcharAt()throws Exception{
assertEquals('S',a.charAt(0));
assertEquals('g',a.charAt(5));
assertEquals('r',a.charAt(11));
}
@Test
public void testcapacity()throws Exception{
assertEquals(28,a.capacity());
assertEquals(40,b.capacity());
assertEquals(52,c.capacity());
}
@Test
public void testlength()throws Exception{
assertEquals(12,a.length());
assertEquals(24,b.length());
assertEquals(36,c.length());
}
@Test
public void testindexOf()throws Exception{
assertEquals(0,a.indexOf("Str"));
assertEquals(5,a.indexOf("gBu"));
assertEquals(8, c.indexOf("ffer"));
}
}
运行结果截图
（三）OCP原则和DIP原则的应用
package NBE7;
/**
* \* Created with IntelliJ IDEA.
* \* User: Shape Of My Heart
* \* Date: 2020/10/10
* \* Time: 20:52
* \* Besides,some of the best things in life are total mistakes.
* \* Description:
* \
**/
abstract class Data {
abstract public void DisplayValue();
}
class Integer extends Data {
int value;
Integer() {
value = 20192307 % 6;
}
public void DisplayValue() {
System.out.println(value);
}
}
class Byte extends Data {
byte value;
Byte() {
value = 20192307 % 6;
}
public void DisplayValue() {
System.out.println(value);
}
}
class Short extends Data {
short value;
Short() {
value = 20192307 % 6;
}
public void DisplayValue() {
System.out.println(value);
}
}
class Boolean extends Data {
boolean value;
Boolean() {
value = 20192307 % 6 == 4;
}
public void DisplayValue() {
System.out.println(value);
}
}
class Long extends Data {
long value;
Long() {
value = 20192307;
}
public void DisplayValue() {
System.out.println(value);
}
}
class Double extends Data {
double value;
Double() {
value = 20192307 % 6;
}
public void DisplayValue() {
System.out.println(value);
}
}
class Float extends Data {
float value;
Float() {
value = 20192307 % 6;
}
public void DisplayValue() {
System.out.println(value);
}
}
// Pattern Classes
abstract class Factory {
abstract public Data CreateDataObject();
}
class IntFactory extends Factory {
public Data CreateDataObject() {
return new Integer();
}
}
class ByteFactory extends Factory {
public Data CreateDataObject() {
return new Byte();
}
}
class ShortFactory extends Factory {
public Data CreateDataObject() {
return new Short();
}
}
class BoolenFactory extends Factory {
public Data CreateDataObject() {
return new Boolean();
}
}
class LongFactory extends Factory {
public Data CreateDataObject() {
return new Long();
}
}
class DoubletFactory extends Factory {
public Data CreateDataObject() {
return new Double();
}
}
class FloatFactory extends Factory {
public Data CreateDataObject() {
return new Float();
}
}
//Client classes
class Document {
Data pd;
Document(Factory pf) {
pd = pf.CreateDataObject();
}
public void DisplayData() {
pd.DisplayValue();
}
}
//Test class
public class MyDoc {
static Document d;
public static void main(String[] args) {
d = new Document(new IntFactory());
d.DisplayData();
d = new Document(new ByteFactory());
d.DisplayData();
d = new Document(new ShortFactory());
d.DisplayData();
d = new Document(new BoolenFactory());
d.DisplayData();
d = new Document(new LongFactory());
d.DisplayData();
d = new Document(new DoubletFactory());
d.DisplayData();
d = new Document(new FloatFactory());
d.DisplayData();
}
}
运行结果截图
（四）以TDD的方式开发一个复数类Complex
产品代码
package NBE2;
/**
* \* Created with IntelliJ IDEA.
* \* User: Shape Of My Heart
* \* Date: 2020/10/10
* \* Time: 21:16
* \* Besides,some of the best things in life are total mistakes.
* \* Description:
* \
**/
public class Complex {
// 定义属性并生成getter,setter
double RealPart;
double ImagePart;
// 定义构造函数
public Complex() {
RealPart = 0;
ImagePart = 1;
}
public Complex(double R, double I) {
ImagePart = I;
RealPart = R;
}
//Override Object
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof Complex)) {
return false;
}
Complex complex = (Complex) obj;
if (complex.RealPart != ((Complex) obj).RealPart) {
return false;
}
if (complex.ImagePart != ((Complex) obj).ImagePart) {
return false;
}
return true;
}
public String toString() {
String string = "";
if (ImagePart > 0)
string = RealPart + "+" + ImagePart + "i";
if (ImagePart == 0)
string = RealPart + "";
if (ImagePart < 0)
string = RealPart + " " + ImagePart + "i";
return string;
}
// 定义公有方法:加减乘除
Complex ComplexAdd(Complex a) {
double b = 0, c = 0;
b = RealPart + a.RealPart;
c = ImagePart + a.ImagePart;
System.out.println("(" + RealPart + "+" + ImagePart + "i) + (" + a.RealPart + "+" + a.ImagePart + ") = " + b + "+" + c + "i");
return new Complex(b, c);
}
Complex ComplexSub(Complex a) {
double b = 0, c = 0;
b = RealPart - a.RealPart;
c = ImagePart - a.ImagePart;
System.out.println("(" + RealPart + "+" + ImagePart + "i) - (" + a.RealPart + "+" + a.ImagePart + ") = " + b + "+" + c + "i");
return new Complex(b, c);
}
Complex ComplexMulti(Complex a) {
double b = 0, c = 0;
b = RealPart * a.RealPart;
c = ImagePart * a.ImagePart;
System.out.println("(" + RealPart + "+" + ImagePart + "i) * (" + a.RealPart + "+" + a.ImagePart + ") = " + b + "+" + c + "i");
return new Complex(b, c);
}
Complex ComplexDiv(Complex a) {
if (a.RealPart == 0 || a.ImagePart == 0) {
System.out.println("被除数不能为0，错误");
return new Complex();
}
double d = Math.sqrt(a.RealPart * a.RealPart) + Math.sqrt(a.ImagePart * a.ImagePart);
double b = 0, c = 0;
b = (RealPart * a.RealPart + ImagePart * a.ImagePart) / d;
c = Math.round((RealPart * a.ImagePart - ImagePart * a.RealPart) / d);
System.out.println("(" + RealPart + "+" + ImagePart + "i) / (" + a.RealPart + "+" + a.ImagePart + ") = " + b + "+" + c + "i");
return new Complex(b, c);
}
}
测试代码
package NBE2;
import junit.framework.TestCase;
import org.testng.annotations.Test;
public class ComplexTest extends TestCase {
Complex complex = new Complex(1, 1);
@Test
public void testAdd() {
assertEquals(new Complex(3.0, 3.0), complex.ComplexAdd(new Complex(2.0, 2.0)));
}
@Test
public void testSub() {
assertEquals(new Complex(-5.0, -2.0), complex.ComplexSub(new Complex(6.0, 3.0)));
}
@Test
public void testMulti() {
assertEquals(new Complex(3.0, 2.0), complex.ComplexMulti(new Complex(3.0, 2.0)));
}
@Test
public void testDiv() {
assertEquals(new Complex(1.0, 1.0), complex.ComplexDiv(new Complex(1.0, 1.0)));
assertEquals(new Complex(0.0, 0.0), complex.ComplexDiv(new Complex(1.0, 0.0)));
//边缘测试
}
}
运行结果截图
（五）UML建模
三、实验过程中遇到的问题和解决过程
- 问题1：idea在进行run的时候，一直出现这个窗口,必须对JAVA程序进行配置
- 问题1解决方案：按照教程重新进行JAVA项目配置，在结构位置进行项目运行就可以了
四、心得体会
- 在这次实验过程中，我遇到了许多问题，其中既有知识上的漏洞，也有不细心导致的马虎，这一切都补充，完善，丰富，扩展了我的计算机知识体系。在不断修复问题的过程中，我使用了很多方式去查询资料，例如：《数据结构与面向对象程序设计》，博客园平台，CSDN平台，码云平台，知乎app,等。在这个Linux命令行的使用中，我还进一步熟悉了Intellij IDEA这个平台的使用与运行方式，提高了自己自主学习的能力，为我接下来学习数据结构以及JAVA语言程序设计打下了坚实的基础，并在不断探索的过程中逐步提升了自己。
