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The simplest way to comma-delimit a list?
What is the clearest way to comma-delimit a list in Java?
30 Answers
30
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Comparing boxed Long values 127 and 128
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TL;DR
Java caches boxed Integer instances from -128 to 127. Since you are using == to compare objects references instead of values, only cached objects will match. Either work with long unboxed primitive values or use .equals() to ...
Java equivalent to C# extension methods
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Java does not support extension methods.
Instead, you can make a regular static method, or write your own class.
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Adding n hours to a date in Java?
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cal.setTime(new Date()) is not needed - the javadoc of Calendar.getInstance() says: "The Calendar returned is based on the current time in the default time zone with the default locale."
– mithrandir
Dec 10 '14 at 9:54
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Best way to concatenate List of String objects? [duplicate]
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Your approach is dependent on Java's ArrayList#toString() implementation.
While the implementation is documented in the Java API and very unlikely to change, there's a chance it could. It's far more reliable to implement this yourself (loops, StringBuild...
Converting String to “Character” array in Java
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One liner with java-8:
String str = "testString";
//[t, e, s, t, S, t, r, i, n, g]
Character[] charObjectArray =
str.chars().mapToObj(c -> (char)c).toArray(Character[]::new);
What it does is:
get an IntStream of the character...
How to remove line breaks from a file in Java?
How can I replace all line breaks from a string in Java in such a way that will work on Windows and Linux (ie no OS specific problems of carriage return/line feed/new line etc.)?
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Converting an int to a binary string representation in Java?
...(ideally, simplest) to convert an int to a binary string representation in Java?
16 Answers
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Spring MVC: Complex object as GET @RequestParam
...ror for request mentioned in answer:
"Failed to convert value of type 'java.lang.String[]' to required type
'java.lang.Long[]'; nested exception is
java.lang.NumberFormatException: For input string: \"353,234\""
The data class will work only for the following request params form:
http://l...
split string only on first instance - java
...t I want it to split on first instance only. How can I do that ? Here is a JavaScript example for '_' char but it doesn't work for me
split string only on first instance of specified character
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