20192318 实验三《数据结构与面向对象程序设计》实验报告

20192318 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: 邢苏
学号: 20192318
实验教师:王志强
实验日期:2020年10月10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

  • 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

  • 第一个提交点
    代码如下:
    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";
    }
    }
    测试代码如下:
    package test;

import junit.framework.TestCase;

public class MyUtilTest extends TestCase
{
@Test
public void testNormal()
{
assertEquals("不及格", MyUtilTest.percentage2fivegrade(55));
assertEquals("及格", MyUtilTest.percentage2fivegrade(65));
assertEquals("中等", MyUtilTest.percentage2fivegrade(75));
assertEquals("良好", MyUtilTest.percentage2fivegrade(85));
assertEquals("优秀", MyUtilTest.percentage2fivegrade(95));

}
@Test
public void testBorder()
{
    assertEquals("不及格", MyUtilTest.percentage2fivegrade(0));
    assertEquals("及格", MyUtilTest.percentage2fivegrade(60));
    assertEquals("中等", MyUtilTest.percentage2fivegrade(70));
    assertEquals("良好", MyUtilTest.percentage2fivegrade(80));
    assertEquals("优秀", MyUtilTest.percentage2fivegrade(90));
    assertEquals("优秀", MyUtilTest.percentage2fivegrade(100));
}
@Test
public void testExceptions()
{
    assertEquals("错误", MyUtilTest.percentage2fivegrade(-5));
    assertEquals("错误", MyUtilTest.percentage2fivegrade(110));
}
private static String percentage2fivegrade(int i)
{
    //如果成绩小于0,转成“错误”
    if ((i < 0))
        return "错误";
        //如果成绩小于60,转成“不及格”
    else if (i < 60)
        return "不及格";
        //如果成绩在60与70之间,转成“及格”
    else if (i < 70)
        return "及格";
        //如果成绩在70与80之间,转成“中等”
    else if (i < 80)
        return "中等";
        //如果成绩在80与90之间,转成“良好”
    else if (i < 90)
        return "良好";
        //如果成绩在90与100之间,转成“优秀”
    else if (i <= 100)
        return "优秀";
        //如果成绩大于100,转成“错误”
    else
        return "错误";
}

}
运行结果如下:

  • 第二个提交点
    代码如下:
    public class StringBufferDemo
    {
    public static void main(String [] args){
    StringBuffer buffer = new StringBuffer(20);
    buffer.append('S');
    buffer.append("tringBuffer");
    System.out.println(buffer.charAt(1));
    System.out.println(buffer.capacity());
    System.out.println(buffer.indexOf("tring12345"));
    System.out.println("buffer = " + buffer.toString());
    System.out.println(buffer.length());
    }
    }
    测试代码如下:
    package test;

import junit.framework.TestCase;

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 testindexOf() throws Exception{
assertEquals(0,a.indexOf("Str"));
assertEquals(5,a.indexOf("gBu"));
assertEquals(9,a.indexOf("fer"));
}
}
运行结果如下:

  • 第三个提交点:
    代码如下:

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=(long)20192318;
}
public void DisplayValue(){
System.out.println (value);
}
}
class Byte extends Data {//Byte继承Data类
byte value;
Byte() {
value=(byte)20192318;
}
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 LongFactory extends Factory {
public Data CreateDataObject(){
return new Long();
}
}
class ByteFactory extends Factory {//ByteFactory继承工厂类
public Data CreateDataObject(){
return new Byte();
}
}
//Client classes
class Document {
Data data;
Document(Factory factory){
data = factory.CreateDataObject();
}
public void DisplayData(){
data.DisplayValue();

}

}
public class MyDoc {
static Document d;
static Document c;
public static void main(String[] args) {
d = new Document(new ByteFactory());
d.DisplayData();
c = new Document(new LongFactory());
c.DisplayData();
}
}
运行结果如下;

  • 第四个提交点
    代码如下:
    import java.lang.*;
    public class Complex {
    public void setRealpart(double R){
    RealPart=R;
    }
    public double getRealpart(){
    return RealPart;
    }
    public void setImagePart(double I){
    ImagePart=I;
    }
    public double getImagePart(){
    return ImagePart;
    }

      double RealPart;
      double ImagePart;
      public Complex(double R,double I){
          RealPart=R;
          ImagePart=I;
      }
      public boolean equals(Complex obj){
          if(this.getRealpart()==obj.getRealpart() && this.getImagePart()==obj.getImagePart())
              return true;
          else
              return false;
      }
      public String toString(){
          return RealPart+"+"+ImagePart+"i";
      }
    
      public Complex ComplexAdd(Complex a){
          return new Complex(this.RealPart+a.RealPart,this.ImagePart+a.ImagePart);
      }
      public Complex ComplexSub(Complex a){
          return new Complex(this.RealPart-a.RealPart,this.ImagePart-a.ImagePart);
      }
      public Complex ComplexMulti(Complex a){
          return new Complex(this.RealPart*a.RealPart-this.ImagePart*a.ImagePart,
                  this.RealPart*a.ImagePart+this.ImagePart*a.RealPart);
      }
      public Complex ComplexDiv(Complex a){
          double x=this.RealPart;
          double y=this.ImagePart;
          double m=a.RealPart;
          double n=a.ImagePart;
          return new Complex((x*m+y*n)/(m*m+n*n),(y*m-x*n)/(m*m+n*n));
      }
    

}
测试代码如下:
package test;

import junit.framework.TestCase;

public class ComplexTest extends TestCase {
Complex p1=new Complex(1,1);
Complex p2=new Complex(1,-1);
@Test
public void testAdd(){
assertEquals("2.0+0.0i",p1.ComplexAdd(p2).toString());
System.out.println(p1.ComplexAdd(p2));
}
@Test
public void testSub(){
assertEquals("0.0+2.0i",p1.ComplexSub(p2).toString());
System.out.println(p1.ComplexSub(p2));
}
@Test
public void testMulti(){
assertEquals("2.0+0.0i",p1.ComplexMulti(p2).toString());
System.out.println(p1.ComplexSub(p2));
}
@Test
public void testDiv(){
assertEquals("0.0+1.0i",p1.ComplexDiv(p2).toString());
System.out.println(p1.ComplexDiv(p2));
}
public class Complex {
public void setRealpart(double R){
RealPart=R;
}
public double getRealpart(){
return RealPart;
}
public void setImagePart(double I){
ImagePart=I;
}
public double getImagePart(){
return ImagePart;
}

    double RealPart;
    double ImagePart;
    public Complex(double R,double I){
        RealPart=R;
        ImagePart=I;
    }
    public boolean equals(Complex obj){
        if(this.getRealpart()==obj.getRealpart() && this.getImagePart()==obj.getImagePart())
            return true;
        else
            return false;
    }
    public String toString(){
        return RealPart+"+"+ImagePart+"i";
    }

    public Complex ComplexAdd(Complex a){
        return new Complex(this.RealPart+a.RealPart,this.ImagePart+a.ImagePart);
    }
    public Complex ComplexSub(Complex a){
        return new Complex(this.RealPart-a.RealPart,this.ImagePart-a.ImagePart);
    }
    public Complex ComplexMulti(Complex a){
        return new Complex(this.RealPart*a.RealPart-this.ImagePart*a.ImagePart,
                this.RealPart*a.ImagePart+this.ImagePart*a.RealPart);
    }
    public Complex ComplexDiv(Complex a){
        double x=this.RealPart;
        double y=this.ImagePart;
        double m=a.RealPart;
        double n=a.ImagePart;
        return new Complex((x*m+y*n)/(m*m+n*n),(y*m-x*n)/(m*m+n*n));
    }
}

}
运行结果如下:

  • 第五个提交点
    代码UML建模

3. 实验过程中遇到的问题和解决过程

  • 问题一:在测试代码中出现了教程链接之外的报错,如下图
  • 问题一解决方案:在图中所示的报错红名之后均添加一个Test即可解决问题
  • 问题二:在编写测试代码时,在每一个测试案例之前均添加一个@Test均报错
  • 问题二解决方案:
    1.File-->Project Structure-->Modules-->右侧Dependencies-->+号-->JARs or directories...
    2.在弹出窗口中找到IDEA的安装目录-->点击lib展开-->选择所需的两个包(hamcrest-core-1.3.jar与junit-4.12.jar)-->点击ok
    即可解决问题

其他

由于之前没有学习过测试代码的编写以及如何去使用它,所以这次的实验有很多地方下不去手

参考资料

posted @ 2020-10-12 11:00  20192318邢苏  阅读(181)  评论(0编辑  收藏  举报