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Mahesh Parahar has Published 255 Articles
Mahesh Parahar
250 Views
A list can be converted to a set object using Set constructor. The resultant set will elliminate any duplicate entry present in the list and will contains only the unique values.Set set = new HashSet(list);On similar pattern, we can get a list from a set using its constructor.List list = ... Read More
Mahesh Parahar
148 Views
The List provides two methods to convert a List into Array.1. Use toArray() method without parameter.Object[] toArray()ReturnsAn array containing all of the elements in this list in proper sequence.2. Use toArray() with array. T[] toArray(T[] a)Type ParameterT − The runtime type of the array.Parametersa − The array into which the ... Read More
Mahesh Parahar
148 Views
A list can be converted to a set object using Set constructor. The resultant set will elliminate any duplicate entry present in the list and will contains only the unique values.Set set = new HashSet(list);Or we can use set.addAll() method to add all the elements of the list to the ... Read More
Mahesh Parahar
352 Views
The List provides two methods to convert a List into Array.1. Use toArray() method without parameter.Object[] toArray()ReturnsAn array containing all of the elements in this list in proper sequence.2. Use toArray() with array. T[] toArray(T[] a)Parametersa − The array into which the elements of this list are to be stored, ... Read More
Mahesh Parahar
486 Views
List provides a method size() to check the current size of the list.Syntaxint size()Returns the number of elements in this list. If this list contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.ReturnsThe number of elements in this list.ExampleThe following example shows how to get size of a list using size() method.package ... Read More
Mahesh Parahar
4K+ Views
List provides a method contains() to check if list contains that element or not. It utilizes equals() method so we need to override the equals() method in the element type.Syntaxboolean contains(Object o)Returns true if this list contains the specified element. More formally, returns true if and only if this list ... Read More
Mahesh Parahar
2K+ Views
We can utilize Arrays.asList() method to get a List of specified elements in a single statement.Syntaxpublic static List asList(T... a)Returns a fixed-size list backed by the specified array. (Changes to the returned list "write through" to the array.)Type ParameterT − The runtime type of the array.Parametersa − The array ... Read More
Mahesh Parahar
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We can insert element between two items of an array list easily using its add() method.Syntaxvoid add(int index, E element)Inserts the specified element at the specified position in this list (optional operation). Shifts the element currently at that position (if any) and any subsequent elements to the right (adds one ... Read More
Mahesh Parahar
12K+ Views
SolutionYes, We can insert null values to a list easily using its add() method. In case of List implementation does not support null then it will throw NullPointerException.Syntaxboolean add(E e)Appends the specified element to the end of this list.Type ParameterE − The runtime type of the element.Parameterse − Element to ... Read More
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