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How can I count the number of matches for a regex?
...tcher.find() does not find all matches, only the next match.
Solution for Java 9+
long matches = matcher.results().count();
Solution for Java 8 and older
You'll have to do the following. (Starting from Java 9, there is a nicer solution)
int count = 0;
while (matcher.find())
count++;
Btw,...
No Exception while type casting with a null in java
... equal to "null"
I wondered where that is specified and looked it up the Java Specification:
The null reference can always be assigned or cast to any reference type (§5.2, §5.3, §5.5).
If the reference is null, it is converted to the string "null" (four ASCII characters n, u, l, l).
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Data structure: insert, remove, contains, get random element, all at O(1)
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@aamadmi - well, in Java I guess it should. In pseudo-code, contains should work just fine :)
– r0u1i
Apr 23 '14 at 13:22
4
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How to add JTable in JPanel with null layout?
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Nested/Combination Layout Example
The Java Tutorial has comprehensive information on using layout managers. See the Laying Out Components Within a Container lesson for further details.
One aspect of layouts that is not covered well by the tutorial is that of nes...
How to make a Java Generic method static?
The following is a snippet on how to make a java generic class to append a single item to an array. How can I make appendToArray a static method. Adding static to the method signature results in compile errors.
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How can I parse a local JSON file from assets folder into a ListView?
... to replace "json_return_by_the_function" with something? I'm kinda new to Java :(
– theWildSushii
Nov 13 '13 at 5:22
1
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Constructor overloading in Java - best practice
... the least to the most arguments in the constructor call. Is this standard Java style? Why?: In my opinion it would make sense to do it the opposite way that way you the first constructor definition you should see is the one that has all the details.
– Josie Thompson
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How to get Enum Value from index in Java?
I have an enum in Java:
4 Answers
4
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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
2
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iterating over and removing from a map [duplicate]
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As of Java 8 you could do this as follows:
map.entrySet().removeIf(e -> <boolean expression>);
Oracle Docs: entrySet()
The set is backed by the map, so changes to the map are reflected in the set, and vice-versa
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