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Why do this() and super() have to be the first statement in a constructor?
Java requires that if you call this() or super() in a constructor, it must be the first statement. Why?
19 Answers
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How to pass objects to functions in C++?
I am new to C++ programming, but I have experience in Java. I need guidance on how to pass objects to functions in C++.
7 A...
Google Gson - deserialize list object? (generic type)
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Method to deserialize generic collection:
import java.lang.reflect.Type;
import com.google.gson.reflect.TypeToken;
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Type listType = new TypeToken<ArrayList<YourClass>>(){}.getType();
List<YourClass> yourClassList = new Gson().fromJson(jsonArray, listT...
Pretty-Print JSON in Java
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If you are using a Java API for JSON Processing (JSR-353) implementation then you can specify the JsonGenerator.PRETTY_PRINTING property when you create a JsonGeneratorFactory.
The following example has been originally published on my blog pos...
Cannot issue data manipulation statements with executeQuery()
...() rather than executeQuery().
Here's an extract from the executeUpdate() javadoc which is already an answer at its own:
Executes the given SQL statement, which may be an INSERT, UPDATE, or DELETE statement or an SQL statement that returns nothing, such as an SQL DDL statement.
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'0000-00-00 00:00:00' can not be represented as java.sql.Timestamp error
... I "just change the database", thousands of lines of PHP code will break.
Java programmers need to accept the MySQL zero-date and they need to put a zero date back into the database, when other languages rely on this "feature".
A programmer connecting to MySQL needs to handle null and 0000-00-00 a...
Gson custom seralizer for one variable (of many) in an object using TypeAdapter
... approach looks better if you're frequently going to modify fields in your Java object. It's a trade-off of ease-of-use vs flexibility, take your pick.
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How to initialize List object in Java?
... @Christoffer Hammarström to print a list or an array, you could use java.util.Arrays.toString(array);, so this feature is already given..
– Maxr1998
Jun 3 '15 at 13:00
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What is a covariant return type?
What is a covariant return type in Java? In object-oriented programming in general?
9 Answers
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How does a Java HashMap handle different objects with the same hash code?
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I'm late, but for those still wondering: A hashcode in Java is an int, and an int has 2^32 possible values
– Xerus
Oct 18 '17 at 16:48
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