20165301实验二java面向对象程序设计

20165301实验二java面向对象程序设计

实验目的与要求（提交点一）：

• 参考http://www.cnblogs.com/rocedu/p/6371315.html#SECUNITTEST完成单元测试的学习
• 提交最后三个JUnit测试用例（正常情况，错误情况，边界情况）都通过的截图，截图上要有画图加水印，输入自己的学号
• 测试用例至少要包含正常情况，错误情况，边界情况的测试

实验内容及结果截图

• 伪代码

百分制转五分制：
如果成绩小于60，转成“不及格”
如果成绩在60与70之间，转成“及格”
如果成绩在70与80之间，转成“中等”
如果成绩在80与90之间，转成“良好”
如果成绩在90与100之间，转成“优秀”
其他，转成“错误”

• 实验代码

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";
    }
}

• 单元测试用例

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));
    }
}

• 运行截图
  

实验目的与要求（提交点二）：

• 参考 积极主动敲代码，使用JUnit学习Java
• 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

实验内容及结果截图

• 实验代码

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());
          }
}

• 测试用例

public class StringBufferDemoTest extends TestCase {
    StringBuffer a = new StringBuffer("StringBuffer");//测试12个字符（<=16）
    StringBuffer b = new StringBuffer("StringBufferStringBuffer");//测试24个字符（>16&&<=34）
    StringBuffer c = new StringBuffer("StringBufferStringBufferStringBuffer");//测试36个字符（>=34）
    @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 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(10,a.indexOf("er"));
    }
}

• 运行截图
  

实验要求（提交点三）：

• 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
• 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

实验内容及结果截图

• 实验代码

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 = 5219;
    }
    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
public class MyDoc {
    static Document d;
    public static void main(String[] args) {
        d = new Document(new ShortFactory());
        d.DisplayData();
    }
}

• 运行截图
  

实验要求（提交点4）

• 参考http://www.cnblogs.com/rocedu/p/6736847.html
  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;
// 定义构造函数

public Complex()
public Complex(double R,double I )
//Override Object

public boolean equals(Object obj)
public String toString()
// 定义公有方法:加减乘除

Complex ComplexAdd(Complex a)
Complex ComplexSub(Complex a)
Complex ComplexMulti(Complex a)
Complex ComplexDiv(Complex a)

• 实验代码

public class Complex {
    // 定义属性并生成getter,setter
    double RealPart;
    double ImagePart;
    // 定义构造函数
    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;
    }
    // 定义公有方法:加减乘除
    Complex ComplexAdd(Complex a) {
        return  new Complex(RealPart+a.RealPart,ImagePart+a.ImagePart);
    }
    Complex ComplexSub(Complex a) {
        return new Complex(RealPart-a.RealPart,ImagePart-a.ImagePart);
    }
    Complex ComplexMulti(Complex a) {
        return new Complex(RealPart*a.RealPart,ImagePart*a.ImagePart);
    }
    Complex ComplexDiv(Complex a) {
        if(a.RealPart==0||a.ImagePart==0) {
            System.out.println("被减数不能为0");
            return new Complex();
        }

        double d = Math.sqrt(a.RealPart*a.RealPart)+Math.sqrt(a.ImagePart*a.ImagePart);
        return new Complex((RealPart*a.RealPart+ImagePart*a.ImagePart)/d,Math.round((RealPart*a.ImagePart-ImagePart*a.RealPart)/d));
    }
}

• 测试用例

import static org.junit.Assert.*;
import org.junit.Test;
import junit.framework.TestCase;
public class ComplexTest extends TestCase {
    Complex complex = new Complex(1,1);
    @Test
    public void testAdd(){
        assertEquals(new Complex(3.3,3.4), complex.ComplexAdd(new Complex(2.3,2.4)));
    }
    //测试加法
    @Test
    public void testSub(){
        assertEquals(new Complex(-5.3,-2.4), complex.ComplexSub(new Complex(6.3,3.4)));
    }
    //测试减法
    @Test
    public void testMulti(){
        assertEquals(new Complex(3.0,2.0), complex.ComplexMulti(new Complex(3.0,2.0)));
    }
    //测试乘法
    @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)));
        //assertEquals(new Complex(0.0,0.0), complex.ComplexDiv(new Complex(3,4)));
        //边缘测试
    }
    @Test
    public void testequals(){
        assertEquals(true, complex.equals(new Complex(1.0,1.0)));
    }
    //测试判断相等
}

• 运行截图
  

实验提交点5

1.实验要求

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)

• 实验截图
  

实验体会与总结

• 本次实验过后我更加理解了java语言面向对象的特点,同时学会了Junit的使用，对uml图有了初步了解但还没有掌握完全。需要进行更多的练习，才能更加熟悉。

步骤	耗时	百分比
需求分析	15	11.5%
设计	20	15.3%
代码实现	50	38.4%
测试	30	23.0%
分析总结	15	11.5%