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Cross field validation with Hibernate Validator (JSR 303)
...package constraints;
import constraints.impl.FieldMatchValidator;
import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
import static java.lang.annotation.ElementType.TYPE;
import...
How do I efficiently iterate over each entry in a Java Map?
If I have an object implementing the Map interface in Java and I wish to iterate over every pair contained within it, what is the most efficient way of going through the map?
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How to specify function types for void (not Void) methods in Java8?
I'm playing around with Java 8 to find out how functions as first class citizens. I have the following snippet:
4 Answers
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Loop through all the files with a specific extension
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No fancy tricks needed:
for i in *.java; do
[ -f "$i" ] || break
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done
The guard ensures that if there are no matching files, the loop will exit without trying to process a non-existent file name *.java. In bash (or shells supporting something sim...
Create array of regex matches
In Java, I am trying to return all regex matches to an array but it seems that you can only check whether the pattern matches something or not (boolean).
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How to convert Strings to and from UTF8 byte arrays in Java
In Java, I have a String and I want to encode it as a byte array (in UTF8, or some other encoding). Alternately, I have a byte array (in some known encoding) and I want to convert it into a Java String. How do I do these conversions?
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What is the best way to find the users home directory in Java?
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The bug you reference (bug 4787391) has been fixed in Java 8. Even if you are using an older version of Java, the System.getProperty("user.home") approach is probably still the best. The user.home approach seems to work in a very large number of cases. A 100% bulletproof solutio...
Java Naming Convention with Acronyms [closed]
What is the correct name for the following Java class:
DVDPlayer or DvdPlayer ?
10 Answers
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Is List a subclass of List? Why are Java generics not implicitly polymorphic?
I'm a bit confused about how Java generics handle inheritance / polymorphism.
17 Answers
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What is the use of hashCode in Java?
In Java, obj.hashCode() returns some value. What is the use of this hash code in programming?
9 Answers
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