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[Source] Java about overriding toString() methods

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Posted on 2022-2-27 12:34:15 | | | |
Requirements: During the development process, all values of the object field need to be output to facilitate debugging and analysis problems. We can convert the object into a JSON string for output, or we can override the toString() method to output the object's value directly.

If the toString() method is not overridden, the system will call the toString() method of the object by default, and the output format is as follows:

<fully qualified class name>@<hash code of object in hexadecimal>
For example: Test@7a3d45bd
When an object overrides the toString() method, the rewritten method is called, as follows:



But by writing dead stitches like this return stringOne disadvantage is that when adding a field, you need to modify the toString() methodThis will be very troublesome. If there are many fields, a large number of "+" splicings will explode memory if the system memory is small (assuming that there are more system entities), because every "+" will new a String object.

using commons-lang3 packageToStringBuilderThese problems can be avoided very well. The Maven project is introduced as follows:


The sample code is as follows:

The renderings are as follows:



(End)





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