Straight from the API Specifications for the ClassCastException:
Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance.
So, for example, when one tries to cast an Integer to a String, String is not an subclass of Integer, so a ClassCastException will be thrown.
Object i = Integer.valueOf(42); String s = (String)i; // ClassCastException thrown here.
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