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。

截图

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));

    }

}

截图

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();

    }

截图

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());

    }

}

截图

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

巴特西

20155316 实验二《Java面向对象程序设计》实验报告

实验1

实验内容

问题与解答

截图

实验2

实验内容

代码

设计

实现

StringBufferDemo类

StringBufferDemoTest测试类

截图

实验3

实验内容

代码

设计

实现

截图

实验4

实验内容

代码

Complex类

ComplexTest测试类

截图

实验5

实验内容

截图

参考资料

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