Go through Array of object in java

Question

I've created this class:

class Remote
{
    private static string name;
    private Button[] button;

    public void delRemote() 
    {
        Remote.name = null;
    }

    public boolean checkAvailable()
    {
        return ((Remote.name) == null);
    }
}

and I want to change checkAvailable so it can check a whole array after I initialize it like so:

Remote remote1[];

Is this possible without having to call checkAvailable n number of times?

No..private static string name; --> name is at class level not object level... So, all instances of Remote will use the same copy of name.. — TheLostMind
– TheLostMind, Commented Feb 19, 2014 at 3:52
Can I change checkAvailable to check a whole array, like remote1? Or is it not possible since I initialize remote1 as an array outside of the class? — user2665581
– user2665581, Commented Feb 19, 2014 at 3:53
If your goal is to have check available be false if remote[k].name=null then you can break the loop at return false whenever a case is found. Worst case, you'll have a loop that runs in O(n), which, unless you have some seriously large numbers, is still efficient. — dsrees
– dsrees, Commented Feb 19, 2014 at 3:56

TheLostMind · Accepted Answer · 2014-02-19 04:03:02Z

1

@user2665581 - See... name is a static field.. which means it exists at class level and all other "instances" of the class share the same field (name).

Now, you don't have a custom constructor. So, by default name will be initialized to null.

If you do,

Remote remote1[] = new Remote[4];

Since name is private you cannot access it from outside the class... And you don't have any method to change the value of name inside the class.. So, basically, with the code which you have given, you cannot change the value of name.. name will always be null... And check availabile will always return true

answered Feb 19, 2014 at 4:03

TheLostMind

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Comments

Benjamin · Accepted Answer · 2014-02-19 05:43:09Z

0

              JButton b[]=new JButton[10];
             for(int i=0;i<10;i++)
             {
                 b[i]=new JButton(""+i);
             }
            int size=0;
            for(int j=0;j<10;j++)
             {
                  b[j].setBounds(size,10,10,10);
                  size +=10;
                  add(b[j]);
              }

answered Feb 19, 2014 at 5:43

Benjamin

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