20145313第二次实验-优快云博客

本文介绍了一个用于处理复数运算的Java类Complex，并通过单元测试验证了加法、减法、乘法和除法等操作的正确性。此外，还展示了如何使用异常处理来应对除数为零的情况。

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20145313第二次实验

单元测试

代码实现

测试用例

找到BUG，进行修改

TDD测试用例

建立MyUtil类并测试

模块化

UML建模

继承

练习

源代码

package exp2;
public class Complex {
protected int a;
protected int b;
public Complex(int a, int b) {
this.a = a;
this.b = b;
}

public String toString() {
return this.a + " + " + this.b + "i";
 }

public static Complex addition(Complex complex1, Complex complex2) {
  int a = complex1.a + complex2.a;
int b = complex1.b + complex2.b;
return new Complex(a, b);
}

public static Complex subtract(Complex complex1, Complex complex2) {
int a = complex1.a - complex2.a;
int b = complex1.b - complex2.b;
return new Complex(a, b);
}

public static Complex multiplication(Complex complex1, Complex complex2) {
int a = complex1.a * complex2.a - complex1.b * complex2.b;
int b = complex1.b * complex2.a + complex1.a * complex2.b;
return new Complex(a, b);
}

public static Complex division(Complex complex1, Complex complex2) throws Exception {
if (complex2.a == 0) {
throw new Exception("complex2.a is 0");
}
if (complex2.b == 0) {
throw new Exception("complex2.b is 0");
}
int a = (complex1.a * complex2.a + complex1.b * complex2.b) / (complex2.a * complex2.a + complex2.b * complex2.b);
int b = (complex1.b * complex2.a - complex1.a * complex2.b) / (complex2.a * complex2.a + complex2.b * complex2.b);
return new Complex(a, b);
 }
}

测试代码

package exp2;
public class Comtest {
 public static void main(String[] args) throws Exception{
 Complex complex1 = new Complex(1, 2);
    Complex complex2 = new Complex(3, 4);
System.out.println(complex1 + " + " + complex2 + " = " + Complex.addition(complex1, complex2));
System.out.println(complex1 + " - " + complex2 + " = " + Complex.subtract(complex1, complex2));
System.out.println(complex1 + " x " + complex2 + " = " + Complex.multiplication(complex1, complex2));
 System.out.println(complex1 + " / " + complex2 + " = " + Complex.division(complex1, complex2));
}
}