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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...
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...
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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Is C++14 adding new keywords to C++?
... needs of new niches. Python is one example. Other examples are C++ --> Java, Java --> Scala, Common Lisp --> Clojure, C++ --> D. Some languages grow indefinitely because their community is convinced that their favourite language is the only true language and they want it to be suited fo...
How to remove all null elements from a ArrayList or String Array?
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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.
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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
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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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What does 'public static void' mean in Java?
What does public static void mean in Java?
9 Answers
9
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How to detect shake event with android?
...ort android.hardware.SensorManager;
import android.content.Context;
import java.lang.UnsupportedOperationException;
public class ShakeListener implements SensorListener
{
private static final int FORCE_THRESHOLD = 350;
private static final int TIME_THRESHOLD = 100;
private static final int S...
How can I safely encode a string in Java to use as a filename?
...the user put in (not with a meaningful name anyway).
EDIT:Fixed regex for java
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