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Iterating through a list in reverse order in java
...ator that will go through the list in reverse, here is an example:
import java.util.Iterator;
import java.util.List;
public class ReverseIterator<T> implements Iterator<T>, Iterable<T> {
private final List<T> list;
private int position;
public ReverseIterator(...
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...
Java Map equivalent in C#
...trying to hold a list of items in a collection with a key of my choice. In Java, I would simply use Map as follows:
3 Answe...
How to Iterate over a Set/HashSet without an Iterator?
...opulate set
for (String s : set) {
System.out.println(s);
}
Or with Java 8:
set.forEach(System.out::println);
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How to remove all null elements from a ArrayList or String Array?
...
Try:
tourists.removeAll(Collections.singleton(null));
Read the Java API. The code will throw java.lang.UnsupportedOperationException for immutable lists (such as created with Arrays.asList); see this answer for more details.
...
Build and Version Numbering for Java Projects (ant, cvs, hudson)
...-practices for systematic build numbering and version number management in Java projects? Specifically:
9 Answers
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How do I serialize an object and save it to a file in Android?
...se. It is extremely easy to implement too. developer.android.com/reference/java/io/Serializable.html
– mtmurdock
Aug 9 '12 at 22:07
6
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What does 'public static void' mean in Java?
What does public static void mean in Java?
9 Answers
9
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keytool error :java.io.IoException:Incorrect AVA format
... escape it with a leading backslash, e.g. Acme\, Inc. See docs.oracle.com/javase/6/docs/technotes/tools/solaris/…. This also works in the signing dialog of the Eclipse IDE.
– Yojimbo
Apr 30 '13 at 21:26
...
Java Regex Capturing Groups
...: This order was placed for QT
group 2: 3000
group 3: ! OK?
More info on Java Pattern here.
Finally, the capturing groups are delimited by round brackets, and provide a very useful way to use back-references (amongst other things), once your Pattern is matched to the input.
In Java 6 groups ca...