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How to convert an int array to String with toString method in Java [duplicate]
...|,|\\s", "");
and now you have a String which can be parsed back to java.lang.Number, for example,
long veryLongNumber = Long.parseLong(intStr);
Or you can use the java 8 streams, if you hate regex,
String strOfInts = Arrays
.stream(intArray)
.mapToObj(String::valueOf)...
Why cannot cast Integer to String in java?
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No. Every object can be casted to an java.lang.Object, not a String. If you want a string representation of whatever object, you have to invoke the toString() method; this is not the same as casting the object to a String.
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Checking that a List is not empty in Hamcrest
...als(new ArrayList<>(0), Arrays.asList("foo", "bar");
you get
java.lang.AssertionError
Expected :[]
Actual :[foo, bar]
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How does Java handle integer underflows and overflows and how would you check for it?
...promoting the operands to int or long, per JLS 4.2.2.)
As of Java 8, java.lang.Math provides addExact, subtractExact, multiplyExact, incrementExact, decrementExact and negateExact static methods for both int and long arguments that perform the named operation, throwing ArithmeticException on overfl...
Best practice to validate null and empty collection in Java
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You can use org.apache.commons.lang.Validate's "notEmpty" method:
Validate.notEmpty(myCollection) -> Validate that the specified argument collection is neither null nor a size of zero (no elements); otherwise throwing an exception.
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Android Get Current timestamp?
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From developer.android.com/reference/java/lang/… I found that System.nanoTime() is an alternative to System.currentTimeMillis() and it has no unpredictable fluctuations, and is designed for measuring duration differences.
– Bianca Daniciuc
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OnCreateOptionsMenu() not called in Fragment
... crashes with 11-27 01:55:34.468: E/AndroidRuntime(12294): Caused by: java.lang.ClassCastException: com.android.internal.view.menu.MenuItemImpl cannot be cast to android.widget.SearchView
– Android_programmer_office
Nov 26 '13 at 20:26
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How to make System.out.println() shorter
... plugin for your favorite text editor/IDE
Static Import
import static java.lang.System.out;
out.println("Hello World");
Explore JVM languages
Scala
println("Hello, World!")
Groovy
println "Hello, World!"
Jython
print "Hello, World!"
JRuby
puts "Hello, World!"
Clojure
(println "Hello, World!...
Removing whitespace from strings in Java
...StringUtils.deleteWhitespace(whitespaces);
You can find it here.
commons-lang includes lots more and is well supported.
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How do I get a platform-dependent new line character?
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The commons-lang library has a constant field available called SystemUtils.LINE_SEPARATOR
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