20175324 2018-2019-2 实验二 面向对象程序设计 实验报告

20175324 2018-2019-2 实验二 面向对象程序设计 实验报告

实验要求

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、熟悉S.O.L.I.D原则
5、了解设计模式

实验内容与运行结果

  • 实验二 面向对象程序设计-1

参考 http://www.cnblogs.com/rocedu/p/6371315.html#SECUNITTEST
参考http://www.cnblogs.com/rocedu/p/6736847.html

提交最后三个测试用例都通过的截图,截图上要有画图加水印,输入自己的学号。

待测试代码:

    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 {
    public void testZhengchang() {
        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 testYichang(){
        assertEquals("错误",MyUtil.percentage2fivegrade(-55));
        assertEquals("错误",MyUtil.percentage2fivegrade(105));
    }
    @Test
    public void testBianjie(){
        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));
    }
}

截图如下:

  • 实验二 面向对象程序设计-2

参考 积极主动敲代码,使用JUnit学习Java (http://www.cnblogs.com/rocedu/p/4837092.html)
参考http://www.cnblogs.com/rocedu/p/6736847.html
以 TDD的方式研究学习StringBuffer,提交你的单元测试用例和测试通过的截图,截图要加上学号水印。

待测试代码:

    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 a1 = new StringBuffer("StringBuffer");
    StringBuffer a2 = new StringBuffer("StringBufferStringBuffer");
    StringBuffer a3 = new StringBuffer("StringBuffer used by 20175312");
    @Test
    public void testCharAt() throws Exception//验证是否是整个字符串中的第x个字符
    {
        assertEquals('S',a1.charAt(0));
        assertEquals('t',a2.charAt(13));
        assertEquals('b',a3.charAt(18));
    }
    @Test
    public void testcapacity() throws Exception{//验证容量
        assertEquals(28,a1.capacity());
        assertEquals(40,a2.capacity());
        assertEquals(45,a3.capacity());
    }
    @Test
    public void testlength() throws Exception{//验证字符串的长度
        assertEquals(12,a1.length());
        assertEquals(24,a2.length());
        assertEquals(29,a3.length());
    }
    @Test
    public void testindexOf(){//验证位置
        assertEquals(6,a1.indexOf("Buff"));
        assertEquals(1,a2.indexOf("tring"));
        assertEquals(25,a3.indexOf("5312"));
    }
}

截图如下:

  • 实验二 面向对象程序设计-3

实验二 Java面向对象程序设计(http://www.cnblogs.com/rocedu/p/4472842.html)

参考http://www.cnblogs.com/rocedu/p/6736847.html

对设计模式示例进行扩充,体会OCP原则和DIP原则的应用,初步理解设计模式
用自己的学号%6进行取余运算,根据结果进行代码扩充:
0: 让系统支持Byte类,并在MyDoc类中添加测试代码表明添加正确,提交测试代码和运行结的截图,加上学号水印
1: 让系统支持Short类,并在MyDoc类中添加测试代码表明添加正确,提交测试代码和运行结的截图,加上学号水印
2: 让系统支持Boolean类,并在MyDoc类中添加测试代码表明添加正确,提交测试代码和运行结的截图,加上学号水印
3: 让系统支持Long类,并在MyDoc类中添加测试代码表明添加正确,提交测试代码和运行结的截图,加上学号水印
4: 让系统支持Float类,并在MyDoc类中添加测试代码表明添加正确,提交测试代码和运行结的截图,加上学号水印
5: 让系统支持Double类,并在MyDoc类中添加测试代码表明添加正确,提交测试代码和运行结的截图,加上学号水印

学号20175312,12%6=0,做“0: 让系统支持Byte类,并在MyDoc类中添加测试代码表明添加正确,提交测试代码和运行结的截图,加上学号水印”

实验代码:

    public class MyDoc {
    static Document d;
    static Document e;
    public static void main(String[] args) {
        e=new Document(new ByteFactory());
        e.DisplayData();
    }
}

abstract class Data {
    abstract public void DisplayValue();
}
class Integer extends  Data {
    int value;
    Integer() {
        value=5312;
    }
    public void DisplayValue(){
        System.out.println (value);
    }
}
class Byte extends Data {
    byte value;
    Byte(){
        value=12;
    }
    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 ByteFactory extends Factory {
    public Data CreateDataObject(){
        return new Byte();
    }
}
class Document {
    Data pd;
    Document(Factory pf){
        pd = pf.CreateDataObject();
    }
    public void DisplayData(){
        pd.DisplayValue();
    }
}

截图如下:

  • 实验二 面向对象程序设计-4

提交:单元测试代码和运行成功截图及码云上代码链接,截图要加上学号水印

参考http://www.cnblogs.com/rocedu/p/6736847.html

任务:以TDD的方式开发一个复数类Complex,要求如下:
// 定义属性并生成getter,setter
double RealPart;
double ImagePart;

待测试代码:

    public class Complex{
    double RealPart;
    double ImagePart;
    public double getRealPart(){
        return RealPart;
    }
    public double getImagePart(){
        return ImagePart;
    }

    public Complex(){}
    public Complex(double R,double I){
        RealPart = R;
        ImagePart = I;
    }

    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 s = new String();
        if(ImagePart>0)
            s = getRealPart()+"+"+getImagePart()+"i";
        if(ImagePart==0)
            s = getRealPart()+"";
        if(ImagePart<0)
            s = getImagePart()+getImagePart()+"i";
        if(RealPart==0)
            s = getImagePart()+"i";
        if(ImagePart==0&&RealPart==0)
            s = "0";
        return s;
    }

    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);
    }
    public Complex ComplexDiv(Complex a){
        return new Complex((RealPart * a.ImagePart + ImagePart * a.RealPart) / (a.ImagePart * a.ImagePart + a.RealPart * a.RealPart), (ImagePart * a.ImagePart + RealPart * a.RealPart) / (a.RealPart * a.RealPart + a.RealPart * a.RealPart));
    }

}    

测试代码:

    import junit.framework.TestCase;
import org.junit.Test;

public class ComplexTest extends TestCase {
    Complex a = new Complex(2.0,4.0);
    Complex b = new Complex(0.0,-0.0);
    Complex c = new Complex(-4.0,0.0);
    @Test
    public void testgetRealpart(){
        assertEquals(2.0,a.getRealPart());
        assertEquals(0.0,b.getRealPart());
        assertEquals(-4.0,c.getRealPart());
    }
    @Test
    public void testgetImagePart(){
        assertEquals(4.0,a.getImagePart());
        assertEquals(-0.0,b.getImagePart());
        assertEquals(0.0,c.getImagePart());
    }
    @Test
    public void testComplexAdd(){
        String q = a.ComplexAdd(b).toString();
        String w = b.ComplexAdd(c).toString();
        String e = c.ComplexAdd(a).toString();
        assertEquals("2.0+4.0i",q);
        assertEquals("-4.0",w);
        assertEquals("-2.0+4.0i",e);
    }
    @Test
    public void testComplexSub(){
        String r = a.ComplexSub(b).toString();
        String t = b.ComplexSub(c).toString();
        String y = c.ComplexSub(a).toString();
        assertEquals("2.0+4.0i",r);
        assertEquals("4.0",t);
        assertEquals("-8.0i",y);
    }
    @Test
    public void testComplexMulti(){
        String u = a.ComplexMulti(b).toString();
        String i = b.ComplexMulti(c).toString();
        String o = c.ComplexMulti(a).toString();
        assertEquals("0",u);
        assertEquals("0",i);
        assertEquals("-8.0",o);
    }
    @Test
    public void testComplexDiv(){
        String p = c.ComplexDiv(a).toString();
        assertEquals("-2.0i",p);
    }
    @Test
    public void testtoString(){
        assertEquals("2.0+4.0i",a.toString());
        assertEquals("0",b.toString());
        assertEquals("-4.0",c.toString());
    }
}

截图如下:

  • 实验二 面向对象程序设计-5

使用WhiteStarUML对实验二中的代码进行建模,发类图的截图,加上学号水印。
参考http://www.cnblogs.com/rocedu/p/6736847.html

类图中只少两个类。

截图如下:

遇到的问题

  • 问题一

    在调试test的时候不小心删除了输出项,所有的项目都出现了一个红色的J,无法run,我还认为是idea坏了。

解决办法

  • 解决问题一
    我上网查找方法后,在idea设置里删除了原有路径,重新设定了output,就ok了。

码云链接

 

posted @ 2019-04-19 09:31  2017532王陈峤宇  阅读(276)  评论(0编辑  收藏  举报