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round up to 2 decimal places in java? [duplicate]
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did you import java.text.DecimalFormat; ?
– amitchhajer
Jul 28 '12 at 13:42
2
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Properties file in python (similar to Java Properties)
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pyjavaproperties seems to be an option if you don't want to use Jython: bitbucket.org/jnoller/pyjavaproperties
– Hans-Christoph Steiner
Nov 16 '11 at 19:46
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Why doesn't the JVM cache JIT compiled code?
... to take resources from other projects. Given the choice between this and Java 8 lambda+streams I'd rather have the latter.
– Thorbjørn Ravn Andersen
Jan 1 '15 at 19:20
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How do I execute a program using Maven?
I would like to have a Maven goal trigger the execution of a java class. I'm trying to migrate over a Makefile with the lines:
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Compare two Byte Arrays? (Java)
...0011110001", 2).toByteArray() == array)
When dealing with objects, == in java compares reference values. You're checking to see if the reference to the array returned by toByteArray() is the same as the reference held in array, which of course can never be true. In addition, array classes don't ov...
Java code for getting current time [duplicate]
I am searching code in java for fetching or synchronizing my local PC system time into my application.
14 Answers
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Java null check why use == instead of .equals()
In Java I am told that when doing a null check one should use == instead of .equals(). What are the reasons for this?
16 An...
org.hibernate.MappingException: Could not determine type for: java.util.List, at table: College, for
... @All: Nobody told me about, the utter code misplacement in Main.java :(
– user405398
Sep 22 '10 at 23:59
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How to set HttpResponse timeout for Android in Java
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In my example, two timeouts are set. The connection timeout throws java.net.SocketTimeoutException: Socket is not connected and the socket timeout java.net.SocketTimeoutException: The operation timed out.
HttpGet httpGet = new HttpGet(url);
HttpParams httpParameters = new BasicHttpParams();...
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,...