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1) INterface cannot implement any methods.But,Abstract class implement methods.
Hashtable is Synchronized & It doesn't store null values.
Hashmap is not Synchronized & It does support null values.
Hashtable is Synchronized & It doesn't store null values.
Hashmap is not Synchronized & It does support null values.
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2) The Synchronized keyword is used to avoid deadlock condition.
Transient is not a keyword. It is a variable,that may not be serialized.
Transient is not a keyword. It is a variable,that may not be serialized.
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Common questions are,
1) Difference between interface and abstract class, hashmap hash table
2) Use of synchronized method, transient keyword
3) OOPS features
4) Maps,multi threading, exception handling.
1) Difference between interface and abstract class, hashmap hash table
2) Use of synchronized method, transient keyword
3) OOPS features
4) Maps,multi threading, exception handling.
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