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Author: Vijay Karnam

Arraylist to Array Using ToArray() in java

Arraylist to Array Using ToArray() in java

Syntax: <T> T[] toArray(T[] a) Eg : String[] y = x.toArray(new String[0]); T – the runtime type of the array to contain the collection Parameters: a – the array into which the elements of this list are to be stored, if it is big enough; otherwise, a new array of the same runtime type is allocated for this purpose. Returns: an array containing the elements of this list Throws: ArrayStoreException – if the runtime type of the specified array is not a…

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hashMap Vs TreeMap Vs LinkedHashMap

hashMap Vs TreeMap Vs LinkedHashMap

════════════╦═════════════════════╦═══════════════════╦═════════════════════╗ ║ Property ║ HashMap ║ TreeMap ║ LinkedHashMap ║ ╠══════════════╬═════════════════════╬═══════════════════╬═════════════════════╣ ║ Iteration ║ no guarantee order ║ sorted according ║ ║ ║ Order ║ will remain constant║ to the natural ║ insertion-order ║ ║ ║ over time ║ ordering ║ ║ ╠══════════════╬═════════════════════╬═══════════════════╬═════════════════════╣ ║ Get/put ║ ║ ║ ║ ║ remove ║ O(1) ║ O(log(n)) ║ O(1) ║ ║ containsKey ║ ║ ║ ║ ╠══════════════╬═════════════════════╬═══════════════════╬═════════════════════╣ ║ ║ ║ NavigableMap ║ ║ ║ Interfaces ║ Map ║ Map ║ Map ║…

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