20192303 2020-2021-1 《数据结构与面向对象程序设计》实验三报告
20192303 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:杨佳宁
学号:20192303
实验教师:王志强
实验日期:2020年10月8日
必修/选修:必修
1、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)。
(1)初步掌握单元测试和TDD
(2)理解并掌握面向对象三要素:封装、继承、多态
(3)初步掌握UML建模
(4)完成蓝墨云上 (1)-(5)实验。
2、实验过程及结果
(1)实验3-1
产品代码:
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:
import org.junit.Test;
import junit.framework.TestCase;
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("错误", MyUtil.percentage2fivegrade(105));
assertEquals("错误", 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:
(2)实验3-2
产品代码:
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.indexOf("tring12345"));
System.out.println("buffer = " + buffer.toString());
System.out.println(buffer.length());
}
}
测试代码:
import junit.framework.TestCase;
import org.junit.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('t',a.charAt(1));
assertEquals('B',a.charAt(6));
assertEquals('r',a.charAt(2));
}
@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(1,c.indexOf("tri"));
}
@Test
public void testtoString() throws Exception{
assertEquals("StringBuffer",a.toString());
assertEquals("StringBufferStringBuffer",b.toString());
assertEquals("StringBufferStringBufferStringBuffer",c.toString());
}
}
运行截图:
(3)实验3-3
import java.util.Objects;
abstract class Data {
abstract public void DisplayValue();
}
class Integer extends Data {
int value;
Integer(){
value = 100;
}
public void DisplayValue(){
System.out.println(value);
}
}
class Long extends Data{
long value;
Long(){
value=20192303;
}
public void DisplayValue(){
System.out.println(value);
}
}
abstract class Factory{
abstract public Data CreateDataObject();
}
class IntFactory extends Factory {
public Data CreateDataObject(){
return new Integer();
}
}
class LongFactory extends Factory{
public Data CreateDataObject(){
return new Long();
}
}
class Document {
Data pd;
Document(Factory pf){
pd=pf.CreateDataObject();
}
public void DisplayData(){
pd.DisplayValue();
}
}
public class MyDoc {
static Document i;
static Document k;
public static void main(String[] args){
i=new Document(new IntFactory());
i.DisplayData();
k=new Document(new LongFactory());
k.DisplayData();
}
}
运行截图:
(4)实验3-4
产品代码:
public class Complex {
double RealPart;
double ImagePart;
public Complex(double RealPart,double ImagePart){
this.RealPart=RealPart;
this.ImagePart=ImagePart;
}
public static double getRealPart(double RealPart){
return RealPart;
}
public double getImagePart(double ImagePart){
return ImagePart;
}
public Complex ComplexAdd(Complex a){
return new Complex(RealPart+a.RealPart,ImagePart+a.ImagePart);
}
public Complex ComplexSub(Complex a){
return new Complex(RealPart-a.RealPart,ImagePart-a.ImagePart);
}
public Complex ComplexMulti(Complex a){
return new Complex(RealPart*a.RealPart-ImagePart*a.ImagePart,ImagePart*a.RealPart+RealPart*a.ImagePart);
}
public Complex ComplexDiv(Complex a){
return new Complex((RealPart*a.RealPart+ImagePart*a.ImagePart)/(a.RealPart*a.RealPart+a.ImagePart*a.ImagePart),(ImagePart*a.ImagePart-RealPart*a.RealPart)/(a.RealPart*a.RealPart+a.ImagePart*a.ImagePart));
}
public String toString(){
String s=" ";
if(ImagePart>0)
s=RealPart+"+"+ImagePart+"i";
if(ImagePart==0)
s=RealPart+" ";
if(ImagePart<0)
s=RealPart+" "+ImagePart+"i";
return s;
}
}
测试代码:
import junit.framework.TestCase;
import org.junit.Test;
import static org.junit.Assert.*;
public class ComplexTest extends TestCase {
Complex i1 = new Complex(3,2);
Complex i2 = new Complex(1,1);
Complex i3 = new Complex(5,6);
@Test
public void testComplexAdd() throws Exception{
assertEquals("4.0+3.0i",i1.ComplexAdd(i2).toString());
assertEquals("6.0+7.0i",i2.ComplexAdd(i3).toString());
assertEquals("8.0+8.0i",i1.ComplexAdd(i3).toString());
}
@Test
public void testComplexSub() throws Exception{
assertEquals("2.0+1.0i",i1.ComplexSub(i2).toString());
assertEquals("-2.0 -4.0i",i1.ComplexSub(i3).toString());
assertEquals("-4.0 -5.0i",i2.ComplexSub(i3).toString());
}
@Test
public void testComplexMulti() throws Exception{
assertEquals("1.0+5.0i",i1.ComplexMulti(i2).toString());
assertEquals("-1.0+11.0i",i2.ComplexMulti(i3).toString());
}
@Test
public void testComplexDiv() throws Exception{
assertEquals("5.5+0.5i",i3.ComplexDiv(i2).toString());
assertEquals("2.5 -0.5i",i1.ComplexDiv(i2).toString());
}
}
(5)实验3-5
3、实验中遇到的问题和解决过程
问题1:找不到jar包
问题1解决方案:通过查询博客安装了“junit-4.12.jar”得到解决
3、其他(感悟、思考等)
这次的实验有些难,用了较长的时间去完成。在今后的学习过程中,应提高自学能力同时做好预习工作。
4、参考资料
https://book.douban.com/subject/26851579/
https://www.cnblogs.com/rocedu/p/5182332.html