@Test public void test02(){ try { ExecuteFunction function = () -> { int i = 0; switch (i){ case 0: { throw new IOException("error"); } case 1: { throw new TException("error2"); } default:{ throw new SocketTimeoutException("error3"); } } }; } catch (Exception e) { throw new RuntimeException(e); } } @FunctionalInterface public interface ExecuteFunction<T, E extends Exception> { T run() throws E; }
时间: 2024-02-10 12:34:18 浏览: 24
这段代码是一个Java单元测试,其中定义了一个函数式接口ExecuteFunction,该接口有一个泛型返回值T和一个泛型异常E,其中run()方法声明了可能抛出E类型异常。在test02()方法中,使用lambda表达式实现了ExecuteFunction接口的run()方法,其中通过switch语句模拟了不同的异常情况,并抛出了不同的异常。最后通过try-catch块捕获了可能发生的异常,并将其封装为RuntimeException抛出。
相关问题
import static org.junit.Assert.*; import org.junit.Test; public class CarTest { @Test public void testCar() { fail("Not yet implemented"); } @Test public void testCarStringStringStringInt() { fail("Not yet implemented"); } @Test public void testCarStringStringStringIntFloat() { fail("Not yet implemented"); } @Test public void testCarStringStringStringIntFloatIntBoolean() { fail("Not yet implemented"); } @Test public void testCarCar() { fail("Not yet implemented"); } @Test public void testSetOwner() { fail("Not yet implemented"); } @Test public void testSetMake() { fail("Not yet implemented"); } @Test public void testSetModel() { fail("Not yet implemented"); } @Test public void testSetYearModel() { fail("Not yet implemented"); } @Test public void testSetFuelLevel() { fail("Not yet implemented"); } @Test public void testSetSpeed() { fail("Not yet implemented"); } @Test public void testSetStart() { fail("Not yet implemented"); } @Test public void testGetOwner() { fail("Not yet implemented"); } @Test public void testGetMake() { fail("Not yet implemented"); } @Test public void testGetModel() { fail("Not yet implemented"); } @Test public void testGetYearModel() { fail("Not yet implemented"); } @Test public void testGetFuelLevel() { fail("Not yet implemented"); } @Test public void testGetSpeed() { fail("Not yet implemented"); } @Test public void testGetStart() { fail("Not yet implemented"); } @Test public void testAccelerate() { fail("Not yet implemented"); } @Test public void testBrake() { fail("Not yet implemented"); } @Test public void testIsGasTankEmpty() { fail("Not yet implemented"); } @Test public void testSameOwner() { fail("Not yet implemented"); } @Test public void testEqualsCar() { fail("Not yet implemented"); } @Test public void testToString() { fail("Not yet implemented"); } }完善这段代码
这是一个测试用例类,用于测试 Car 类的各种方法。其中所有的测试方法都是以 fail("Not yet implemented") 的形式定义的,这意味着这些测试方法还没有被实现。因此,我们需要按照具体的测试需求来实现这些测试方法。
首先,我们需要在测试类中创建一个 Car 对象,以便在测试过程中使用。例如:
```
Car car = new Car("John", "Toyota", "Corolla", 2020, 50, 0, false);
```
接下来,我们需要针对 Car 类的每个方法编写相应的测试方法。例如,针对 setOwner() 方法,我们可以编写如下的测试方法:
```
@Test
public void testSetOwner() {
car.setOwner("Mary");
assertEquals("Mary", car.getOwner());
}
```
该测试方法首先调用 setOwner() 方法设置车辆所有者为 Mary,然后调用 getOwner() 方法获取车辆所有者,并使用 assertEquals() 方法判断是否与预期值相同。
同样地,我们需要编写测试方法来测试其他的方法,例如:
```
@Test
public void testAccelerate() {
car.accelerate();
assertEquals(10, car.getSpeed());
}
@Test
public void testBrake() {
car.brake();
assertEquals(0, car.getSpeed());
}
@Test
public void testEqualsCar() {
Car car2 = new Car("John", "Toyota", "Corolla", 2020, 50, 0, false);
assertTrue(car.equals(car2));
}
```
这些测试方法分别测试了 accelerate()、brake() 和 equals() 方法。
最后,我们需要在测试类中添加 @Before 和 @After 注解来设置测试前置条件和清理测试环境。例如:
```
public class CarTest {
private Car car;
@Before
public void setUp() throws Exception {
car = new Car("John", "Toyota", "Corolla", 2020, 50, 0, false);
}
@After
public void tearDown() throws Exception {
car = null;
}
// 测试方法省略
}
```
在 setUp() 方法中创建一个 Car 对象,并在 tearDown() 方法中将其设置为 null,以确保每个测试方法都在相同的测试环境下运行。
#define _CRT_SECURE_NO_WARNINGS #include<iostream> #include <string> using namespace std; template <class T> class myarr { public: myarr(int n) { this->C = n; this->size = 0; this->p = new T[C]; } myarr(const myarr& other) { this->C = other.C; this->size = other.size; this->p = new T[other.C]; for (int i = 0; i < size; i++) p[i] = other[i]; } ~myarr() { if (this->p != NULL) { delete[]this->p; this->p = NULL; } } void push_back(const T& num) { if (this->C == this->size) return; this->p[this->size] = num; this->size++; } void pop_back() { if (this->size == 0) return; this->size--; } myarr& operator=(const myarr& other) { if (this->p != NULL) { delete[]this->p; } this->C = other.C; this->size = other.size; this->p = new T[other.C]; for (int i = 0; i < size; i++) p[i] = other[i]; } T& operator[](int index) { return this->p[index]; } int getC() { return this->C; } int getsize() { return this->size; } private: T* p; int size; int C; }; class base { public: base(); base(string n, int a) { this->age = a; this->name = n; } void show() { cout << "名字: " << name << " 年龄: " << age; } private : string name; int age; }; void myprintf(myarr<base>& m) { for (int i = 0; i < m.getsize(); i++) { m[i].show(); cout << endl; } } void test() { base b1("zhangshan", 100); myarr<base>a(5); for(int i=0;i<5;i++) a.push_back(b1); myprintf(a); } int main() { test(); return 0; }这段代码有什么问题
这段代码有两个问题:
1. 在类myarr的赋值运算符函数中,应该返回*this,即返回当前对象的引用。
2. 在函数myprintf中,应该将参数myarr<base>&改为const myarr<base>&,因为函数并不会修改传入的数组。同时,在函数内部也应该使用const T&遍历数组,以避免不必要的复制。
修改后的代码如下所示:
```
#include<iostream>
#include <string>
using namespace std;
template <class T>
class myarr {
public:
myarr(int n)
{
this->C = n;
this->size = 0;
this->p = new T[C];
}
myarr(const myarr& other)
{
this->C = other.C;
this->size = other.size;
this->p = new T[other.C];
for (int i = 0; i < size; i++)
p[i] = other[i];
}
~myarr()
{
if (this->p != NULL)
{
delete[]this->p;
this->p = NULL;
}
}
void push_back(const T& num)
{
if (this->C == this->size)
return;
this->p[this->size] = num;
this->size++;
}
void pop_back()
{
if (this->size == 0)
return;
this->size--;
}
myarr& operator=(const myarr& other)
{
if (this->p != NULL)
{
delete[]this->p;
}
this->C = other.C;
this->size = other.size;
this->p = new T[other.C];
for (int i = 0; i < size; i++)
p[i] = other[i];
return *this; // 返回当前对象的引用
}
T& operator[](int index)
{
return this->p[index];
}
int getC()
{
return this->C;
}
int getsize()
{
return this->size;
}
private:
T* p;
int size;
int C;
};
class base {
public:
base();
base(string n, int a)
{
this->age = a;
this->name = n;
}
void show() const // 加上const
{
cout << "名字: " << name << " 年龄: " << age;
}
private :
string name;
int age;
};
void myprintf(const myarr<base>& m) // 改为const myarr<base>&
{
for (int i = 0; i < m.getsize(); i++)
{
m[i].show(); // 使用const T&
cout << endl;
}
}
void test()
{
base b1("zhangshan", 100);
myarr<base>a(5);
for(int i=0;i<5;i++)
a.push_back(b1);
myprintf(a);
}
int main()
{
test();
return 0;
}
```