20145325张梓靖 实验二"Java面向对象程序设计"

20145325张梓靖 实验二"Java面向对象程序设计"

程序设计过程

实验内容

使用TDD的方式设计实现复数类 Complex

编写代码

• 设计实现复数类 Complex，复数类 Complex的方法设计有：定义构造函数、更改复数内容、返回复数内容，以及复数间相加、减、乘运算。
• 设计的Test代码第一代：

import org.junit.Test;
public class ComplexNumberTest {
    @Test
    public void TestFunction1() {
        ComplexNumber complexnumber = new ComplexNumber(3, 5);
        ;
        assert complexnumber.m_dRealPart == 3 : "ComplexNumber(double r,double I)构造函数有错误";
        assert complexnumber.m_dImaginPart == 5 : "ComplexNumber(double r,double I)构造函数有错误";
    }

    @Test
    public void TestFunction2() {
        ComplexNumber complexnumber = new ComplexNumber();

        assert complexnumber.m_dImaginPart == 0 : "ComplexNumber()构造函数有错误";
        assert complexnumber.m_dRealPart == 0 : "ComplexNumber()构造函数有错误";
    }

    @Test
    public void TestSetWay() {
        ComplexNumber complexnumber = new ComplexNumber();

        complexnumber.SetRealPart(1);
        complexnumber.SetImaginaryPart(1);
        assert complexnumber.m_dRealPart == 1 : "SetRealPart方法有错误";
        assert complexnumber.m_dImaginPart == 1 : "SetImaginaryPart方法有错误";
    }

    @Test
    public void TestgetWay() {
        ComplexNumber complexnumber = new ComplexNumber();

        complexnumber.SetRealPart(3);
        complexnumber.SetImaginaryPart(5);
        assert complexnumber.GetRealPart() == 3 : "GetRealPart方法有错误";
        assert complexnumber.GetImaginaryPart() == 5 : "GetImaginaryPart方法有错误";
    }

    @Test
    public void TestStringWay() {
        ComplexNumber complexnumber = new ComplexNumber(3,5);

       assert complexnumber.toString()=="3.0+5.0i":"toString方法有错误";
    }

    @Test
    public void TestAddWay1() {
        ComplexNumber complexnumber1 = new ComplexNumber(1,1);
        ComplexNumber complexnumber2 = new ComplexNumber(2,2);
        ComplexNumber complexnumber3=complexnumber1.ComplexAdd1(complexnumber2);

        assert complexnumber3.m_dRealPart == 3 : "ComplexAdd方法有错误";
        assert complexnumber3.m_dImaginPart == 3 : "ComplexAdd方法有错误";
    }

    @Test
    public void TestAddWay2() {
        ComplexNumber complexnumber1 = new ComplexNumber(1,1);
        ComplexNumber complexnumber2=complexnumber1.ComplexAdd2(2);

        assert complexnumber2.m_dRealPart == 3 : "ComplexAdd方法有错误";
        assert complexnumber2.m_dImaginPart == 1 : "ComplexAdd方法有错误";
    }

    @Test
    public void TestMinusWay1() {
        ComplexNumber complexnumber1 = new ComplexNumber(1,1);
        ComplexNumber complexnumber2 = new ComplexNumber(2,2);
        ComplexNumber complexnumber3=complexnumber2.ComplexMinus1(complexnumber1);

        assert complexnumber3.m_dRealPart == 1 : "ComplexMinus方法有错误";
        assert complexnumber3.m_dImaginPart == 1 : "ComplexMinus方法有错误";
    }

    @Test
    public void TestMinusWay2() {
        ComplexNumber complexnumber1 = new ComplexNumber(5,1);
        ComplexNumber complexnumber2=complexnumber1.ComplexMinus2(1);

        assert complexnumber2.m_dRealPart == 4 : "ComplexMinus方法有错误";
        assert complexnumber2.m_dImaginPart == 1 : "ComplexMinus方法有错误";
    }

    @Test
    public void TestMultiWay1() {
        ComplexNumber complexnumber1 = new ComplexNumber(3,3);
        ComplexNumber complexnumber2 = new ComplexNumber(3,5);
        ComplexNumber complexnumber3=complexnumber1.ComplexMulti1(complexnumber2);

        assert complexnumber3.m_dRealPart == -6 : "ComplexMinus方法有错误";
        assert complexnumber3.m_dImaginPart == 24 : "ComplexMinus方法有错误";

    }

    @Test
    public void TestMultiWay2() {
        ComplexNumber complexnumber1 = new ComplexNumber(3,3);
        ComplexNumber complexnumber2=complexnumber1.ComplexMulti2(2);

        assert complexnumber2.m_dRealPart == 6 : "ComplexMinus方法有错误";
        assert complexnumber2.m_dImaginPart == 6 : "ComplexMinus方法有错误";

    }

}

• 根据复数类 Complex的设计构思，编写出复数类 Complex的代码

public class ComplexNumber {
    public double m_dRealPart;
    public double m_dImaginPart;

    public ComplexNumber(){
        this.m_dImaginPart=0;
        this.m_dRealPart=0;
    }

    public ComplexNumber(double r,double I){
        this.m_dRealPart=r;
        this.m_dImaginPart=I;
    }

    public double GetRealPart(){
        return this.m_dRealPart;
    }

    public double GetImaginaryPart(){
        return this.m_dImaginPart;
    }

    public void SetRealPart(double d){
        this.m_dRealPart=d;
    }

    public void SetImaginaryPart(double d){
        this.m_dImaginPart=d;
    }

    public ComplexNumber ComplexAdd1(ComplexNumber c){
        this.m_dRealPart=this.m_dRealPart+c.m_dRealPart;
        this.m_dImaginPart=this.m_dImaginPart+c.m_dImaginPart;
        return this;
    }

    public ComplexNumber ComplexAdd2(double c){
        this.m_dRealPart=this.m_dRealPart+c;
        return this;
    }

    public ComplexNumber ComplexMinus1(ComplexNumber c) {
        this.m_dRealPart = this.m_dRealPart - c.m_dRealPart;
        this.m_dImaginPart = this.m_dImaginPart - c.m_dImaginPart;
        return this;
    }

    public ComplexNumber ComplexMinus2(double c){
        this.m_dRealPart=this.m_dRealPart-c;
        return this;
    }

    public ComplexNumber ComplexMulti1(ComplexNumber c){
        double a=this.m_dImaginPart;
        double b=this.m_dRealPart;

        this.m_dRealPart=b*c.m_dRealPart-(a*c.m_dImaginPart);
        this.m_dImaginPart=b*c.m_dImaginPart+a*c.m_dRealPart;
        return this;
    }

    public ComplexNumber ComplexMulti2(double c){
        double a=this.m_dImaginPart;
        double b=this.m_dRealPart;

        this.m_dRealPart=this.m_dRealPart*c;
        this.m_dImaginPart=this.m_dImaginPart*c;
        return this;
    }

    public String toString(){
        return this.m_dRealPart+"+"+this.m_dImaginPart+"i";
    }
}

• 对复数类 Complex的代码进行单元测试

发现错误，是编写的Complex的代码出现了错误？在TestStringWay中增加输出语句，输出toString的结果：

• 没错误啊，答案和预料的一样。那么问题就是Test代码有问题了

• 所以修改为用assertFquals

@Test
    public void TestStringWay() {
        ComplexNumber complexnumber = new ComplexNumber(3,5);
        System.out.println(complexnumber.toString());
        assertFquals("3.0+5.0i",complexnumber.toString());
    }

• 建模结果截图：