20155316 实验二《Java面向对象程序设计》实验报告

实验1

实验内容

• 参考 博客 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
• 本提交点考查JUnit会不会使用，测试用例至少要包含正常情况，错误情况，边界情况的测试

问题与解答

• 1.运行不了测试类，出现如下问题：
• 
• 【解答】发现是因为建立的项目曾经进行了改地址的操作，中间可能出现了错误导致无法编译成功，重新建一个项目就好了。

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实验2

实验内容

• 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
• 测试自己会不会写JUnit测试用例

代码

设计

在测试类方面，我测试了StringBuffer的charAt()、capacity、indexof()、toString、length方法，探究StringBuffer。

实现

StringBufferDemo类

public class StringBufferDemo {
    StringBuffer buffer;
    public static char BufferCharAt(StringBuffer buffer, int index) {
        return buffer.charAt(index);
    }
    public static int BufferCapacity(StringBuffer buffer) {
        return buffer.capacity();
    }
    public static int BufferLength(StringBuffer buffer) {
        return buffer.length();
    }
    public static int BufferIndexOf(StringBuffer buffer, String str) {
        return buffer.indexOf(str);
    }
    public static String BufferToString(StringBuffer buffer) {
        return "buffer = " + buffer.toString();
    }
}

StringBufferDemoTest测试类

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

public class StringBufferDemoTest extends TestCase {
    StringBuffer buffer1 = new StringBuffer("StringBuffer");
    StringBuffer buffer2 = new StringBuffer("StringBuffer StringBuffer");
    StringBuffer buffer3 = new StringBuffer("StringBuffer StringBuffer StringBuffer");
    @Test
    public void testCharAt() {
        assertEquals('t', StringBufferDemo.BufferCharAt(buffer1,1));
        assertEquals('r', StringBufferDemo.BufferCharAt(buffer1,2));
        assertEquals('i', StringBufferDemo.BufferCharAt(buffer1,3));
    }
    @Test
    public void testCapacity() {
        assertEquals(28, StringBufferDemo.BufferCapacity(buffer1));
        assertEquals(41, StringBufferDemo.BufferCapacity(buffer2));
        assertEquals(54, StringBufferDemo.BufferCapacity(buffer3));
    }
    @Test
    public void testLength() {
        assertEquals(12,StringBufferDemo.BufferLength(buffer1));
        assertEquals(25,StringBufferDemo.BufferLength(buffer2));
        assertEquals(38,StringBufferDemo.BufferLength(buffer3));
    }
    @Test
    public void testIndexOf() {
        assertEquals(1, StringBufferDemo.BufferIndexOf(buffer1, "tring"));
        assertEquals(0, StringBufferDemo.BufferIndexOf(buffer1, "Str"));
        assertEquals(-1, StringBufferDemo.BufferIndexOf(buffer1, "StR"));
        assertEquals(-1, StringBufferDemo.BufferIndexOf(buffer1, "M"));
        assertEquals(8, StringBufferDemo.BufferIndexOf(buffer1, "f"));
    }
    @Test
    public void testToString() {
        assertEquals("buffer = StringBuffer", StringBufferDemo.BufferToString(buffer1));
    }
}

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实验3

实验内容

• 参考实验二 Java面向对象程序设计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
• 设计代码实现系统支持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

代码

设计

扩展如图：

实现

// Server Classes
abstract class Data {
    abstract public void DisplayValue();
}
class Integer extends  Data {
    int value;
    Integer() {
        value=100;
    }
    public void DisplayValue(){
        System.out.println (value);
    }
}
class Float extends  Data {
    float value;
    Float() {
        value=100;
    }
    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 FloatFactory extends Factory {
    public Data CreateDataObject(){
        return new Float();
    }
}
//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 IntFactory());
        d.DisplayData();
        d = new Document(new FloatFactory());
        d.DisplayData();
    }

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实验4

实验内容

• 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)

代码

Complex类

public class Complex {
    // 定义属性并生成getter,setter
    private double RealPart;
    private double ImagePart;

    public double getterRealPart() {
        return this.RealPart;
    }
    public double getterImagePart() {
        return this.ImagePart;
    }
    public void setterRealPart(double RealPart) {
       this.RealPart = RealPart;
    }
    public void setterImagePart(double ImagePart) {
        this.ImagePart = ImagePart;
    }
    // 定义构造函数
    public Complex() {
        this.RealPart = 0;
        this.ImagePart = 0;
    }
    public Complex(double R,double I) {
        this.RealPart = R;
        this.ImagePart = I;
    }

    //Override Object
    public boolean equals(Object obj) {
            if(this==obj) {
                return true;
            }
            if(!(obj instanceof Complex)) {
                return false;
            }
            Complex complex = (Complex) obj;
            if(getterRealPart()!=complex.getterRealPart()) {
                return false;
            }
            if(getterImagePart()!=complex.getterImagePart()) {
                return false;
            }
            return true;
    }
    public String toString() {
        if(getterImagePart()>0) return getterRealPart() + "+" + getterImagePart() + "i";
        else if(getterImagePart()==0) return  "" + getterRealPart();
        else return getterRealPart() + "" + getterImagePart() + "i";
    }

    // 定义公有方法:加减乘除
    Complex ComplexAdd(Complex a) {
        this.setterImagePart(this.getterImagePart()+a.getterImagePart());
        this.setterRealPart(this.getterRealPart()+a.getterRealPart());
        return this;
    }
    Complex ComplexSub(Complex a) {
        this.setterImagePart(this.getterImagePart()-a.getterImagePart());
        this.setterRealPart(this.getterRealPart()-a.getterRealPart());
        return this;
    }
    Complex ComplexMulti(Complex a) {
        this.setterImagePart(a.getterImagePart()*this.getterImagePart() - a.getterRealPart()*this.getterRealPart());
        this.setterRealPart(a.getterImagePart()*this.getterRealPart() + a.getterRealPart()*this.getterImagePart());
        return this;
    }
    Complex ComplexDiv(Complex a) {
        Complex c = new Complex();
        if(a.equals(c)) {                                               //注意0
            System.out.println("Error! Dividend can't be 0!");
        }
        else {
            this.setterImagePart(this.getterImagePart()/a.getterImagePart());
            this.setterRealPart(this.getterRealPart()/a.getterRealPart());
        }
        return this;
    }
}

ComplexTest测试类

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

public class ComplexTest extends TestCase {
    Complex a = new Complex(2, 1);
    Complex b = new Complex(1,2);
    Complex c = new Complex();
    @Test
    public void testAdd() {
        c = a.ComplexAdd(b);
        assertEquals("3.0+3.0i", c.toString());
    }
    @Test
    public void testSub() {
        c = a.ComplexSub(b);
        assertEquals("1.0-1.0i", c.toString());
    }
    @Test
    public void testMulti() {
        c = a.ComplexMulti(b);
        assertEquals("4.0", c.toString());
    }
    @Test
    public void testDiv() {
        c = a.ComplexDiv(c);
        assertEquals("2.0+1.0i", c.toString());
        c = a.ComplexDiv(b);
        assertEquals("2.0+0.5i", c.toString());
    }
}

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实验5

实验内容

• 使用StarUML对实验二中的代码进行建模，发类图的截图，加上学号水印
  类图中只少两个类
• 类，继承，接口实现，组合在UML中表达

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参考资料

• Junit安装
• StarUML的安装