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單項選擇題

Given a method that must ensure that its parameter is not null:

What, inserted at line 12, is the appropriate way to handle a null value?()

A.assert value == null;
B.assert value != null : "value is null";
C.if (value == null){    throw new AssertionException("value is null");   }
D.if (value == null){    throw new IllegalArgumentException("value is null");   }

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