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Multiple queries executed in java in single statement
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Create a procedure with one or more select, and DML queries.
Call it from java using CallableStatement.
You can capture multiple ResultSets executed in procedure.
DML results can't be captured but can issue another select
to find how the rows are affected in the table.
Sample table and procedu...
How does the static modifier affect this code?
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In Java two phases take place: 1. Identification, 2. Execution
In identification phase all static variables are detected and initialized with default values.
So now the values are:
A obj=null
num1=0
num2=0
The second phase, ex...
Does the JVM prevent tail call optimizations?
...bproject's status is listed as "proto 80%"; it is unlikely to make it into Java 7, but I think it has a very good chance at Java 8.
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Java, Classpath, Classloading => Multiple Versions of the same jar/project
... that specific classloader tries to resolve a class name.
According to the java language specification, there is not a uniqueness constraint for a class binary name, but as far as I can see, it should be unique for each classloader.
I can figure out a way to load two classes with the same binary n...
How to exclude certain directories/files from git grep search
...if you want to search for foobar in every file except for those matching *.java you can do:
git grep foobar -- './*' ':(exclude)*.java'
Or using the ! "short form" for exclude:
git grep foobar -- './*' ':!*.java'
Note that in git versions up to v2.12, when using an exclude pathspec, you must h...
Iterate through a HashMap [duplicate]
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Extracted from the reference How to Iterate Over a Map in Java:
There are several ways of iterating over a Map in Java. Let's go over the most common methods and review their advantages and disadvantages. Since all maps in Java implement the Map interface, the following techniques ...
Change case of a file on Windows?
...cifically, I just want to change the case of the file, so that sourceCode.java becomes SourceCode.java , for example. The catch: I'm on a Windows box, and the filesystem thinks those are the same file name.
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Avoiding instanceof in Java
...age);
}
}
}
More info on usage of variables of type Class in Java: http://docs.oracle.com/javase/tutorial/reflect/class/classNew.html
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Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
...ed in the presence of mutable data. This is why generics are invariant in Java. Brief example of unsoundness using Java arrays (which are erroneously covariant):
Object[] arr = new Integer[1];
arr[0] = "Hello, there!";
We just assigned a value of type String to an array of type Integer[]. For ...
Lombok is not generating getter and setter
...ory/org/projectlombok/lombok/1.16.10/lombok-1.16.10.jar), run it (Example: java -jar lombok-1.16.10.jar). A window should appear, browse to your eclipse.exe location.
Click on install.
Launch Eclipse, update project configuration on all projects and voila.
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