Can we create constructor in abstract class ?
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What is the need of "creating and throwing an UserdefinedException" when the "Exception" class is already available?
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Give a practical example of singleton class usage?
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What will happen inside init() in servlet. my interviewer asked servlet lifecycle. i said "once servlet is loaded in to memory init() will be called which performs servlet initialization " . Again interview asked what values will be initialized . what is difference between init() and init(ServletConfig config).
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