Arrays methods implementation

Question

I am looking at methods of class Arrays:

public static int hashCode(double a[])
public static void parallelSort(int[] a, int fromIndex, int toIndex)
public static <T> List<T> asList(T... a)

I see 3 different types of how array could be declared as input parameter. What is the differenece?

For the first two: http://stackoverflow.com/questions/1200621/declare-array-in-java The third one is a var-args array. — Jeroen Vannevel, Aug 12 '15 at 19:26
As you are asking this question, I would really suggest you read through [The Java Tutorials](https://docs.oracle.com/javase/tutorial/java/TOC.html) from start to finish - this is a very basic question. Most basic questions will be answered in those tutorials — Andy Brown, Aug 12 '15 at 19:33

score 2 · Accepted Answer · answered Aug 12 '15 at 19:31

An array's type is written as type[], where type is the data type of the contained elements; the brackets are special symbols indicating that this variable holds an array

and

You can also place the brackets after the array's name ... float anArrayOfFloats[]; However, convention discourages this form; the brackets identify the array type and should appear with the type designation.

And in the case of method parameters:

You can use a construct called varargs to pass an arbitrary number of values to a method ... To use varargs, you follow the type of the last parameter by an ellipsis (three dots, ...), then a space, and the parameter name. The method can then be called with any number of that parameter, including none.

Arrays methods implementation

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