Re: Array Checking in Java.

From:
Lew <lew@lewscanon.com>
Newsgroups:
comp.lang.java.programmer
Date:
Thu, 10 Jan 2008 09:12:07 -0500
Message-ID:
<bY6dnfXADoEquhvanZ2dnUVZ_v-hnZ2d@comcast.com>
Lars Enderin wrote:

Sanny skrev:

Say I have array[100]; I want to assign each of them a Value of 0; In
just 1 step.

int[] myarray = new int[100];

Java gurantees the initialization with 0.
Check the language specification.


What about char array?

char[] chararray = new char[100];

I want all of them to be ' '; Will they be done automatically? Can I
change the default parameter to something else?


See Arrays.fill(char[] a, char val):
http://java.sun.com/j2se/1.5.0/docs/api/java/util/Arrays.html#fill(char[],%20char)


Arrays also has asList()
<http://java.sun.com/javase/6/docs/api/java/util/Arrays.html#asList(T...)>
method, which can be combined with a Set's collection-arg constructor to
create the equivalent Set.

This example uses Character instead of char to obtain object-ness. When
building a Character array, avoid autoboxing from primitive [] inside a method
argument. That's why the Character [] is built prior to the Arrays.asList() call.

  Character [] kars = { '0', 'Z', '-' };
  Set <Character> karacters =
     new HashSet <Character> ( Arrays.asList( kars ));

--
Lew

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