Reuse static string array in Java / Inheritance like concept inside string array

Question

private static String[][] s1 = {
        { "a", "a1" },
        { "b", "b1" },
        { "c", "c1" },
        { "d", "d1" },
}

private static String[][] s2 = {
        { "c", "c1" },
        { "d", "d1" },
        { "e", "e1" },
        { "f", "f1" },
}

Here c,c1 and d,d1 is repeated in those string arrays. How to take that outside and put it in a common string array say s3, and s1 and s2 reuses/inherits it so that it need not be declared in two different places?

Static things are not inherited. So having static arrays you can't. — Saurabh Sharma
– Saurabh Sharma, Commented Jan 15, 2014 at 4:48
Personally, I'd set up a static function and have the static initializers call that. Or have the class constructor call it to set them if necessary. — keshlam
– keshlam, Commented Jan 15, 2014 at 4:51

djechlin · Accepted Answer · 2014-01-15 04:50:31Z

3

static String[] common = { "c", "c1" };

private static String[][] s1 = {
    { "a", "a1" },
    { "b", "b1" },
    common,
    { "d", "d1" }
}

private static String[][] s2 = {
    common,
    { "d", "d1" },
    { "e", "e1" },
    { "f", "f1" }
}

Works fine.

answered Jan 15, 2014 at 4:50

djechlin

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1 Comment

Scary Wombat Over a year ago

Thanks for teaching me something (that I probably will never use) today.

Qing · Accepted Answer · 2014-01-15 04:59:25Z

2

You can use ArrayList rather than String Array, since its very difficult to remove/insert elements if you use String array.

ArrayList<String[]> s1=new ArrayList<String[]>();
ArrayList<String[]> s2=new ArrayList<String[]>();

And use add() method to add all the elements, and scan the lists to find out the overlapped elements by using contains() method. Find that element and save&&remove it.

answered Jan 15, 2014 at 4:59

Qing

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