20175212童皓桢实验三敏捷开发与XP实践实验报告

实验内容

XP基础
XP核心实践
相关工具

实验步骤

一、Code菜单功能的研究

Move Line/statement Down/Up：将某行、表达式向下、向上移动一行
suround with：用 try-catch，for，if等包裹语句
comment with line/block comment:把选中它区域变成注释
show reformat file dialog:按照格式自动对齐
Optimize imports：可以优化imports，去除不必要的imports
Insert Live Template：插入一些记不起来的 Live Template 缩写

二、下载搭档的Complex代码并添加单元测试

1.添加搭档仓库

20175212童皓桢实验三敏捷开发与XP实践实验报告

2.产品代码

/**

 * @author Jason Tong

 * @date 2019/4/29 14:32.

 */

public class Complex {

    // 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){

        ImagePart = I;

        RealPart = R;

    }

    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 str = "";

        if (ImagePart > 0)

            str =  RealPart + "+" + ImagePart + "i";

        if (ImagePart == 0)

            str =  RealPart + "";

        if (ImagePart < 0)

            str = RealPart + " " + ImagePart + "i";

        return str;

    }

    // 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));

    }

}

3.测试代码

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(4.3,4.4), complex.ComplexAdd(new Complex(3.3,3.4)));

    }

    //测试加法

    @Test

    public void testSub(){

        assertEquals(new Complex(-4.3,-3.4), complex.ComplexSub(new Complex(5.3,4.4)));

    }

    //测试减法

    @Test

    public void testMulti(){

        assertEquals(new Complex(4.0,3.0), complex.ComplexMulti(new Complex(4.0,3.0)));

    }

    //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

}

三、重构的练习

原代码为：

class A {

  final double PI=3.1415926;// PI是常量

  public double getArea(final double r) {

     return PI*r*r;

  }

  public final void speak() {

     System.out.println("您好，How's everything here ?");

  }

}

public class Example5_9 {

   public static void main(String args[]) {

      A a=new A();

      System.out.println("面积："+a.getArea(100));

      a.speak();

   }

}

对类名以及变量名进行重构

20175212童皓桢实验三敏捷开发与XP实践实验报告

进行封装

20175212童皓桢实验三敏捷开发与XP实践实验报告

重构后的代码为：

/**

 * @author Jason Tong

 * @date 2019/4/29 16:53.

 */

class Calculate {

    final double PI=3.1415926;// PI是常量

    private int r;

    public double getArea() {

        return PI* getR() * getR();

    }

    public final void speak() {

        System.out.println("您好，How's everything here ?");

    }

    public int getR() {

        return r;

    }

    public void setR(int r) {

        this.r = r;

    }

}

public class Example5_9 {

    public static void main(String args[]) {

        Calculate a=new Calculate();

        a.setR(10);

        System.out.println("面积："+a.getArea());

        a.speak();

    }

}

四、用Java完成密码学内容

用java实现凯撒密码

代码为：

/**

 * @author Jason Tong

 * @date 2019/5/3 16:58.

 */

public class Caesar {

    public static void main(String args[]) throws Exception{

        String s=args[0];

        int key=Integer.parseInt(args[1]);

        Movement m=new Movement();

        int n=s.length();

        String es="";

        for(int i=0;i<s.length();i++){

            char c=s.charAt(i);

            if(c >= 'a' && c <= 'z'){

                es=m.realizeMove(n,c,key,'a','z');

            }

            else if (c >= 'A' && c <= 'Z'){

                es=m.realizeMove(n,c,key,'A','Z');

            }

        }

        System.out.println(es);

    }

}

/**

 * @author Jason Tong

 * @date 2019/5/3 16:59.

 */

public class Movement {

    String es="";

    public  String  realizeMove(int n,char c,int key,char a,char b){

        //移动key%26位

        c+=key%26;

        if(c<a) {

            c+=26;

            //向左超界

        }

        if(c>b) {

            c-=26;

            //向右超界

        }

        es+=c;

        return es;

    }

}