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Playing with arrays

25. Februar 2009 Markus Meissner Einen Kommentar schreiben Kommentare

Presenting today: One of “took me two hours” issues. This codes seems to be ok:

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Object[] strArr = new String[] { "whatever" };
Object[] newArr = ArrayUtils.addAll(strArr, null);
ArrayUtils.addAll(newArr, new Object[] { Boolean.TRUE });

But executing it leads to the following exception:

Exception in thread "main" java.lang.ArrayStoreException
	at java.lang.System.arraycopy(Native Method)
	at org.apache.commons.lang.ArrayUtils.addAll(ArrayUtils.java:2972)

This is because ArrayUtils.addAll takes as type for the returned array the componentType of the first array. Although strArr is defined as Object[], strArr.getClass().getComponentType() returns String, resulting in a String-array.

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