Assert.notEmpty
时间: 2023-12-25 22:04:28 浏览: 25
`Assert.notEmpty()` is a method used in software development to check if an object or collection is not empty. It is typically used as a form of defensive programming, to prevent errors that could occur if an empty object or collection is used in a way that it was not intended to be used.
The `Assert.notEmpty()` method usually takes an object or collection as a parameter and throws an exception if the object or collection is empty. It is commonly used in unit tests to ensure that the expected result is not an empty object or collection.
相关问题
java assert最终Process finished with exit code 0.意味着什么呢
Java中的assert语句用于在代码中检查某个条件是否为true,如果不是则抛出AssertionError异常。当程序中没有抛出任何异常并且正常结束时,Process finished with exit code 0表示程序成功执行完毕。因此,如果在使用assert语句的Java程序中没有抛出AssertionError异常并且正常结束,那么最终的Process finished with exit code 0就表示程序成功执行完毕。
然而,引用中的错误提示Process finished with exit code -2 Empty test suite.表示测试套件为空,可能是由于测试代码中没有包含任何测试用例导致的。而引用中的错误提示org.springframework.util.Assert.notNull(Ljava/lang/Object;Ljava/util/function/Supplier;)V则表示在使用Spring框架时,调用了org.springframework.util.Assert.notNull()方法,但该方法的第一个参数为null,因此抛出了IllegalArgumentException异常。
Implement deep_map, which takes a function f and a link. It returns a new linked list with the same structure as link, but with f applied to any element within link or any Link instance contained in link. The deep_map function should recursively apply fn to each of that Link's elements rather than to that Link itself.其中class Link: empty = () def init(self, first, rest=empty): assert rest is Link.empty or isinstance(rest, Link) self.first = first self.rest = rest def repr(self): if self.rest is not Link.empty: rest_repr = ', ' + repr(self.rest) else: rest_repr = '' return 'Link(' + repr(self.first) + rest_repr + ')' def str(self): string = '<' while self.rest is not Link.empty: string += str(self.first) + ' ' self = self.rest return string + str(self.first) + '>'
以下是实现 deep_map 函数的代码:
```python
class Link:
empty = ()
def __init__(self, first, rest=empty):
assert rest is Link.empty or isinstance(rest, Link)
self.first = first
self.rest = rest
def __repr__(self):
if self.rest is not Link.empty:
rest_repr = ', ' + repr(self.rest)
else:
rest_repr = ''
return 'Link(' + repr(self.first) + rest_repr + ')'
def __str__(self):
string = '<'
while self.rest is not Link.empty:
string += str(self.first) + ' '
self = self.rest
return string + str(self.first) + '>'
def deep_map(self, f):
if self.rest is Link.empty:
return Link(f(self.first))
else:
return Link(f(self.first), self.rest.deep_map(f))
```
使用示例:
```python
def add_one(x):
return x + 1
a = Link(1, Link(2, Link(3, Link(4))))
b = Link(Link(1), Link(Link(2), Link(3)))
print(a.deep_map(add_one)) # Link(2, Link(3, Link(4, Link(5))))
print(b.deep_map(str)) # Link('<1>', Link('<2>', Link('3')))
```
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