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String is immutable while StringBuffer is mutable.
StringBuffer is faster for concatenation operations.
StringBuffer has methods to modify the string.
StringBuffer is thread-safe while String is not.
StringBuffer has a larger memory footprint than String.
Explanation of internal structure of hashmap and hashing algorithm
Hashmap is a data structure that stores key-value pairs using a hash function
Hashing algorithm converts the key into an index in the array
Collisions can occur when two keys map to the same index
Chaining and open addressing are two methods to handle collisions
Load factor determines when to resize the hashmap
Predicate is a functional interface that takes an argument and returns a boolean value. Supplier is a functional interface that takes no argument and returns a value.
Predicate is used for filtering or testing a condition on an object.
Supplier is used for providing a value or generating a value.
Predicate takes an argument and returns a boolean value based on the condition.
Supplier takes no argument and returns a value.
E...
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