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How to convert a String to CharSequence?
...loaded method value join with alternatives:
(x$1: CharSequence,x$2: java.lang.Iterable[_ <: CharSequence])String <and>
(x$1: CharSequence,x$2: CharSequence*)String
cannot be applied to (String, Iterable[String])
val header = String.join(",", cols)
I was able to fix this proble...
What is the purpose of “!” and “?” at the end of method names?
...ware, this isn't always the case. For example, Ruby Array#concat docs.ruby-lang.org/en/2.0.0/Array.html#method-i-concat. Where you can get burnt badly is something like MyActiveRecordModel.column_names.concat(...). Instead you must clone it before doing the concat.
– wintondesh...
How can we prepend strings with StringBuilder?
... StringBuilder insert for java: java.sun.com/j2se/1.5.0/docs/api/java/lang/…
– Matthew Farwell
Apr 12 '09 at 16:21
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Is there a stopwatch in Java?
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You'll find one in
http://commons.apache.org/lang/
It's called
org.apache.commons.lang.time.StopWatch
But it roughly does the same as yours. If you're in for more precision, use
System.nanoTime()
See also this question here:
Time measuring overhead in Java
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Converting a Java collection into a Scala collection
...ort scala.collection.JavaConverters._
val l = new java.util.ArrayList[java.lang.String]
val s = l.asScala.toSet
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Java, Simplified check if int array contains int
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You could simply use ArrayUtils.contains from Apache Commons Lang library.
public boolean contains(final int[] array, final int key) {
return ArrayUtils.contains(array, key);
}
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Why does Math.round(0.49999999999999994) return 1?
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return 0;
}
1. http://docs.oracle.com/javase/6/docs/api/java/lang/Math.html#round%28double%29
2. http://bugs.java.com/bugdatabase/view_bug.do?bug_id=6430675 (credits to @SimonNickerson for finding this)
3. http://docs.oracle.com/javase/7/docs/api/java/lang/Math.html#round%28doubl...
How to check if a json key exists?
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http://developer.android.com/reference/org/json/JSONObject.html#has(java.lang.String)
Returns true if this object has a mapping for name. The mapping may be NULL.
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Best way to concatenate List of String objects? [duplicate]
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Use one of the the StringUtils.join methods in Apache Commons Lang.
import org.apache.commons.lang3.StringUtils;
String result = StringUtils.join(list, ", ");
If you are fortunate enough to be using Java 8, then it's even easier...just use String.join
String result = String.join(",...
Generate fixed length Strings filled with whitespaces
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Since Java 1.5 we can use the method java.lang.String.format(String, Object...) and use printf like format.
The format string "%1$15s" do the job. Where 1$ indicates the argument index, s indicates that the argument is a String and 15 represents the minimal width of...