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Algorithm to return all combinations of k elements from n
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Short java solution:
import java.util.Arrays;
public class Combination {
public static void main(String[] args){
String[] arr = {"A","B","C","D","E","F"};
combinations2(arr, 3, 0, new String[3]);
}
st...
Java Replacing multiple different substring in a string at once (or in the most efficient way)
... or you are operating on many strings, then it could be worthwhile using a java.util.regex.Matcher (this requires time up-front to compile, so it won't be efficient if your input is very small or your search pattern changes frequently).
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Boolean.hashCode()
...r in hashCode?
What is a sensible prime for hashcode calculation?
Why does Java's hashCode() in String use 31 as a multiplier?
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Parcelable where/when is describeContents() used?
...d at some point he realized: Oh, damn, there is no multiple inheritance in Java... :-)
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.NET Process.Start default directory?
I'm firing off a Java application from inside of a C# .NET console application. It works fine for the case where the Java application doesn't care what the "default" directory is, but fails for a Java application that only searches the current directory for support files.
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Difference between final and effectively final
I'm playing with lambdas in Java 8 and I came across warning local variables referenced from a lambda expression must be final or effectively final . I know that when I use variables inside anonymous class they must be final in outer class, but still - what is the difference between final and ef...
Java naming convention for static final variables [duplicate]
.... In my estimation, that is not justification to continue the tradition in Java.
Question of Intention
We should ask ourselves what is the function of static final in our own context. Here are three examples of how static final may be used in different contexts:
public class ChatMessage {
//U...
How can I increment a char?
I'm new to Python, coming from Java and C. How can I increment a char? In Java or C, chars and ints are practically interchangeable, and in certain loops, it's very useful to me to be able to do increment chars, and index arrays by chars.
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Convert ArrayList to String[] array [duplicate]
...sely, it is not allowed to do that. If it could do that, it would violate Java type safety.
– Stephen C
Nov 8 '12 at 4:14
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How to print binary tree diagram?
How can I print a binary tree in Java so that the output is like:
28 Answers
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