Answer / Arpit Gautam

[n "Yes, you can add 'null' to a List in Java. However, if you are using an ArrayList and want to avoid adding 'null', you should use the add() method with a parameter to specify the element."]

class{ ... ... interface myinterface{ ... ... } abstract class{ .. .. } ... .. .. } is this possible to write "Interface and/ or Abstract class inside a class ? if possible whcich one is possible is only interface? is only abstract?

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