20192303 2020-2021-1 《資料結構與面向物件程式設計》實驗三報告
阿新 • • 發佈:2020-10-14
20192303 2020-2021-1 《資料結構與面向物件程式設計》實驗三報告
課程:《資料結構與面向物件程式設計》
班級:1923
姓名:楊佳寧
學號:20192303
實驗教師:王志強
實驗日期:2020年10月8日
必修/選修:必修
1、實驗內容
下載安裝並使用IDEA,完成下面實驗(https://www.cnblogs.com/rocedu/p/6371315.html)。
(1)初步掌握單元測試和TDD
(2)理解並掌握面向物件三要素:封裝、繼承、多型
(3)初步掌握UML建模
(4)完成藍墨雲上 (1)-(5)實驗。
2、實驗過程及結果
(1)實驗3-1
產品程式碼:
public class MyUtil{ public static String percentage2fivegrade(int grade){ //如果成績小於0,轉成“錯誤” if ((grade < 0)) return "錯誤"; //如果成績小於60,轉成“不及格” else if (grade < 60) return "不及格"; //如果成績在60與70之間,轉成“及格” else if (grade < 70) return "及格"; //如果成績在70與80之間,轉成“中等” else if (grade < 80) return "中等"; //如果成績在80與90之間,轉成“良好” else if (grade < 90) return "良好"; //如果成績在90與100之間,轉成“優秀” else if (grade <= 100) return "優秀"; //如果成績大於100,轉成“錯誤” else return "錯誤"; } }
測試程式碼:
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("優秀", MyUtil.percentage2fivegrade(95)); } @Test public void testExceptions() { assertEquals("錯誤", MyUtil.percentage2fivegrade(105)); assertEquals("錯誤", 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("優秀", MyUtil.percentage2fivegrade(90)); assertEquals("優秀", MyUtil.percentage2fivegrade(100)); } }
執行結果截圖:
(2)實驗3-2
產品程式碼:
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()); } }
測試程式碼:
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());
}
}
執行截圖:
(3)實驗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();
}
}
執行截圖:
(4)實驗3-4
產品程式碼:
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;
}
}
測試程式碼:
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)實驗3-5
3、實驗中遇到的問題和解決過程
問題1:找不到jar包
問題1解決方案:通過查詢部落格安裝了“junit-4.12.jar”得到解決
3、其他(感悟、思考等)
這次的實驗有些難,用了較長的時間去完成。在今後的學習過程中,應提高自學能力同時做好預習工作。
4、參考資料
https://book.douban.com/subject/26851579/
https://www.cnblogs.com/rocedu/p/5182332.html