20192305 2020-2021-1 《数据结构与面向对象程序设计》实验三报告
20192305 2020-2021-1 《数据结构与面向对象程序设计》实验三报告
课程：《程序设计与数据结构》
班级： 1923
姓名： 王梓全
学号：20192305
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
- 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。
2. 实验过程及结果
提交点一：
程序：
public class MyUtil {
public static String percentage2fivegrade(int grade) {
if ((grade < 0))
return "错误";
else if (grade < 60)
return "不及格";
else if (grade < 70)
return "及格";
else if (grade < 80)
return "中等";
else if (grade < 90)
return "良好";
else if (grade <= 100)
return "优秀";
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 testException() {
assertEquals("错误", MyUtil.percentage2fivegrade(-55));
assertEquals("错误", MyUtil.percentage2fivegrade(105));
}
@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));
}
}
提交点二：
代码：
public class StringBufferDemo {
StringBuffer buffer = new StringBuffer();
public StringBufferDemo(StringBuffer buffer){
this.buffer = buffer;
}
public Character charAt(int i){
return buffer.charAt(i);
}
public int capacity(){
return buffer.capacity();
}
public int length(){
return buffer.length();
}
public int indexOf(String buf) {
return buffer.indexOf(buf);
}
}
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('S',a.charAt(0));
assertEquals('g',b.charAt(5));
assertEquals('n',c.charAt(16));
}
@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(3, a.indexOf("ing"));
assertEquals(11, b.indexOf("rSt"));
assertEquals(-1, c.indexOf("abca"));
}
}
提交点三：
代码：
abstract class Data {
abstract public void DisplayValue();
}
class Integer extends Data {
int value;
Integer() {
value=100;
}
public void DisplayValue(){
System.out.println (value);
}
}
class Short extends Data {
short value;
Short() {
value = 2305;
}
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 ShortFactory extends Factory {
public Data CreateDataObject(){
return new Short();
}
}
//Client classes
class Document {
Data pd;
Document(Factory pf){
pd = pf.CreateDataObject();
}
public void DisplayData(){
pd.DisplayValue();
}
}
//Test class
class MyDoc {
static Document d;
public static void main(String[] args) {
d = new Document(new ShortFactory());
d.DisplayData();
}
}
提交点四
代码：
public class Complex {
double RealPart;
double ImagePart;
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;
}
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：
import junit.framework.TestCase;
import org.junit.Test;
public class ComplexTest extends TestCase {
Complex complex = new Complex(1, 1);
@Test
public void testAdd() {
assertEquals(new Complex(4.0, 3.0), complex.ComplexAdd(new Complex(3.0, 2.0)));
}
@Test
public void testSub() {
assertEquals(new Complex(-4.0, -2.0), complex.ComplexSub(new Complex(5.0, 3.0)));
}
@Test
public void testMulti() {
assertEquals(new Complex(4.0, 2.0), complex.ComplexMulti(new Complex(2.0, 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)))；
}
}
提交点五：
3. 实验过程中遇到的问题和解决过程
- 问题1：在编写测试代码时，@Test报错，
- 问题1解决方案：点击旁边的小灯泡依据提示自动导入junit.jar包
- 问题2：编写complex无法进行正常编译。
- 问题2解决方法：根据小灯泡的提示进行修改
- 问题3：代码上传码云失败。
- 问题3解决方法：重建一个文件夹，重新链接码云，再复制一遍代码，进行提交。
其他（感悟、思考等）
这次实验很复杂，且具有难度，还需要进行更多的学习。
