I've made a 2D array which is a map for a game. As the player moves around the map the Array changes slightly, but I'd like to be able to refer back to the original, unchanged Array. How can I do this?
Thanks a lot.
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Why do you want to do this? Of which type is the array? – poitroae Feb 25 '13 at 21:15
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http://docs.oracle.com/javase/6/docs/api/java/lang/System.html#arraycopy%28java.lang.Object,%20int,%20java.lang.Object,%20int,%20int%29 – Bhesh Gurung Feb 25 '13 at 21:17
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1What about saving a history of each tile of the map as a linked list? That way you aren't saving duplicate data. – disperse Feb 25 '13 at 21:19
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If arr is a 2d String array:
String[][] copy = arr.clone();
Then, just make changes to copy.
If it is an array of objects, you may want to make a deep copy, i.e. making a copy of all the contained objects. But in your case, since Strings are immutable, a clone will suffice. However, considering storing your data in classes instead of strings.
Andrew Mao
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If you don't need a copy of each element, just the array, use
array.clone()
If you do need to copy each element, you can see this answer.
