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How to use a servlet filter in Java to change an incoming servlet request url?
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Implement javax.servlet.Filter.
In doFilter() method, cast the incoming ServletRequest to HttpServletRequest.
Use HttpServletRequest#getRequestURI() to grab the path.
Use straightforward java.lang.String methods like substring(), split...
Difference between Eclipse Europa, Helios, Galileo
...ault set of plugins to achieve specialized tasks), such as Eclipse IDE for Java Developers, Eclipse IDE for Java EE Developers, Eclipse IDE for C/C++ Developers, etc (see this link for a comparison of their content).
To develop Java Desktop applications, the Helios release of Eclipse IDE for Java D...
Why is “final” not allowed in Java 8 interface methods?
One of the most useful features of Java 8 are the new default methods on interfaces. There are essentially two reasons (there may be others) why they have been introduced:
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Java Constructor Inheritance
I was wondering why in java constructors are not inherited? You know when you have a class like this:
10 Answers
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A field initializer cannot reference the nonstatic field, method, or property
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Java is more 'forgiving' for these kind of constructs. Don't know whether that is a good thing. stackoverflow.com/questions/1494735/…
– Wouter Schut
Feb 3 '15 at 11:52
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Java Multiple Inheritance
In an attempt to fully understand how to solve Java's multiple inheritance problems I have a classic question that I need clarified.
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How do I convert CamelCase into human-readable names in Java?
...th matching lookarounds to split:
Regex split string but keep separators
Java split is eating my characters
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java: ArrayList - how can i check if an index exists?
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Since java-9 there is a standard way of checking if an index belongs to the array - Objects#checkIndex() :
List<Integer> ints = List.of(1,2,3);
System.out.println(Objects.checkIndex(1,ints.size())); // 1
System.out.println(O...
How to get the separate digits of an int number?
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String[] digits2 = number.split("(?<=.)");
In case you're already on Java 8 and you happen to want to do some aggregate operations on it afterwards, consider using String#chars() to get an IntStream out of it.
IntStream chars = number.chars();
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Convert integer into byte array (Java)
... class was designed for such dirty hands tasks though. In fact the private java.nio.Bits defines these helper methods that are used by ByteBuffer.putInt():
private static byte int3(int x) { return (byte)(x >> 24); }
private static byte int2(int x) { return (byte)(x >> 16); }
private sta...