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How to get just the parent directory name of a specific file
How to get ddd from the path name where the test.java resides.
10 Answers
10
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@UniqueConstraint and @Column(unique = true) in hibernate annotation
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From the Java EE documentation:
public abstract boolean unique
(Optional) Whether the property is a unique key. This is a shortcut for the
UniqueConstraint annotation at the table level and is useful for when the unique key...
Easy way to write contents of a Java InputStream to an OutputStream
...mple way to write the contents of an InputStream to an OutputStream in Java. Obviously, the byte buffer code isn't difficult to write, but I suspect I'm just missing something which would make my life easier (and the code clearer).
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What does PermGen actually stand for?
.... Details are of course implementation specific.
Briefly, it contains the Java objects associated with classes and interned strings. In Sun's client implementation with sharing on, classes.jsa is memory mapped to form the initial data, with about half read-only and half copy-on-write.
Java objects...
Good reasons to prohibit inheritance in Java?
What are good reasons to prohibit inheritance in Java, for example by using final classes or classes using a single, private parameterless constructor? What are good reasons of making a method final?
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Why is i++ not atomic?
Why is i++ not atomic in Java?
9 Answers
9
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In Eclipse, what can cause Package Explorer “red-x” error-icon when all Java sources compile without
I'm using Eclipse for Java development. All my sources compile fine and the resulting application compiles fine. However, I keep getting an "red-x" error notification in the Package Explorer.
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Convert a byte array to integer in Java and vice versa
I want to store some data into byte arrays in Java. Basically just numbers which can take up to 2 Bytes per number.
8 Answe...
What's the best way to validate an XML file against an XSD file?
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The Java runtime library supports validation. Last time I checked this was the Apache Xerces parser under the covers. You should probably use a javax.xml.validation.Validator.
import javax.xml.XMLConstants;
import javax.xml.tran...
Parsing JSON Object in Java [duplicate]
...ays of JSON. Choose a json lib that performs well: github.com/fabienrenaud/java-json-benchmark
– fabien
Jun 27 '16 at 20:05
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