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Diff output from two programs without temporary files
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I tried this solution with a Java program and got this error: -bash: syntax error near unexpected token ('. I tried again without parenthesis and got -bash: java: No such file or directory. Does it not work if the command has parameters?
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What is the difference between persist() and merge() in JPA and Hibernate?
... very precise description of semantics of these operations, better than in javadoc:
The semantics of the persist
operation, applied to an entity X are
as follows:
If X is a new entity, it
becomes managed. The entity X will be
entered into the database at or before
transaction ...
In Intellij, how do I toggle between camel case and underscore spaced?
At my company we have two different style guides for java vs sql. In java I have a field named historyOfPresentIllness and when i write the sql, I want to name it history_of_present_illness . Is there a keyboard shortcut to switch from one to the other when I have the phrase highlighted? Or pe...
How to scale threads according to CPU cores?
I want to solve a mathematical problem with multiple threads in Java. my math problem can be separated into work units, that I want to have solved in several threads.
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Can constructors throw exceptions in Java?
... language-idiomatic way of expressing them: which is through exceptions in Java. To my mind, avoiding that idiom is where code gymnastics come in. Likewise mocking is far more effective when you've already used dependency injection rather than calling the constructor within the code. After all, when...
How to check type of variable in Java?
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Java is a statically typed language, so the compiler does most of this checking for you. Once you declare a variable to be a certain type, the compiler will ensure that it is only ever assigned values of that type (or values...
Convert Iterator to ArrayList
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In Java 8, you can use the new forEachRemaining method that's been added to the Iterator interface:
List<Element> list = new ArrayList<>();
iterator.forEachRemaining(list::add);
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Sharing Test code in Maven
...jar containing test classes".
This creates jar file of code from src/test/java using the jar plugin so that modules with tests can share code.
<project>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactI...
How can I inject a property value into a Spring Bean which was configured using annotations?
...t;/property>
</bean>
When retrieved, this bean can be cast to a java.util.Properties which will contain a property named results.max whose value is read from app.properties. Again, this bean can be dependency injected (as an instance of java.util.Properties) into any class via the @Resour...
Does using final for variables in Java improve garbage collection?
...leagues and me have a discussion about the usage of the final keyword in Java to improve the garbage collection.
15 Answe...