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Why do I need to override the equals and hashCode methods in Java?
... prevent your class from functioning properly in conjunction with all hash-based collections, including HashMap, HashSet, and Hashtable.
Let's try to understand it with an example of what would happen if we override equals() without overriding hashCode() and attempt to use a Map.
Say we have a clas...
How to convert a PNG image to a SVG? [closed]
...t to SVG. And finally, merge the three SVG content in one file (SVG is XML based). Hope this could help... Cheers ;-)
– olibre
Oct 9 '14 at 19:21
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Convert Existing Eclipse Project to Maven Project
...all necessary information about the dependencies, it does the following:
Based on <classpathentry/> XML elements in .classpath file, it creates the dependencies on another project, identifies the library jar file and based on its name (for instance jakarta-oro-2.0.8.jar) identifies its vers...
Change IPython/Jupyter notebook working directory
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from jupyter_notebook_config.py file ## DEPRECATED use base_url #c.NotebookApp.base_project_url = '/' ## The base URL for the notebook server. c.NotebookApp.base_url = '/'
– Vodyanikov Andrew Anatolevich
Apr 7 at 6:42
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How can HTML5 “replace” Flash? [closed]
...ve seen sites that bring my powerhouse of a machine to it's knees by Flash based ads. These are admittedly badly done flash ads, but it is flash. Now on a mobile phone an ad that can cause the cpu to spike to 100% is not good and I stand by SJ assertion that Flash is harmful.
–...
Good reasons NOT to use a relational database?
...tools and give good reasons to use them instead of good-old relational databases? In my opinion, most applications rarely use the full power of SQL--it would be interesting to see how to build an SQL-free application.
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How do I catch a PHP fatal (`E_ERROR`) error?
I can use set_error_handler() to catch most PHP errors, but it doesn't work for fatal ( E_ERROR ) errors, such as calling a function that doesn't exist. Is there another way to catch these errors?
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What is git actually doing when it says it is “resolving deltas”?
... git clone are:
Receive a "pack" file of all the objects in the repo database
Create an index file for the received pack
Check out the head revision (for a non-bare repo, obviously)
"Resolving deltas" is the message shown for the second stage, indexing the pack file ("git index-pack").
Pack fil...
When to use single quotes, double quotes, and backticks in MySQL
...ktick) identifiers using the following character set:
ASCII: [0-9,a-z,A-Z$_] (basic Latin letters, digits 0-9, dollar, underscore)
You can use characters beyond that set as table or column identifiers, including whitespace for example, but then you must quote (backtick) them.
Also, although number...
Can overridden methods differ in return type?
...ething that doesn't break "caller code".
In other words: assume that the base bar() is supposed to return int. Then a subclass could return short - but not long because callers will be fine dealing with a short value, but not a long!
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