JAVA--assert.notNull

Today when I was doing JUnit testing on MySQL, I found that codes similar to assertNull(tu) didn’t know what they meant, so I summarized them as follows.

org.springframework.util.Assert
Assert is translated into Chinese as "assertion".
Roughly speaking, it means to conclude that a certain actual value is what you expect, and if it is different, then Throws an exception.

spring source code is as follows:

/**
* Assert that an object is not null .
*

Assert.notNull(clazz, "The class must not be null");

* @param object the object to check
* @param message the exception message to use if the assertion fails
* @throws IllegalArgumentException if the object is null
*/
public static void notNull(Object object, String message) {
if (object == null) {
throw new IllegalArgumentException(message);
}
}

The meaning of this function is that the incoming object must not be empty. Throws an exception if it is empty.

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