LinkedList toArray() method in Java with Example
This java.util.LinkedList.toArray() method is used to convert and LinkedList into an Array. It returns the same LinkedList elements but in the form of Array only.
We have to method to convert LinkedList into an Array
- toArray() – without parameter
- toArray(arrayName) – with parameter
Method-1: toArray() – without parameter
The Java.util.LinkedList.toArray() method returns an array containing all the elements in the list in proper sequence i.e. from first to last. The returned array will be safe as a new array is created (hence new memory is allocated). Thus the caller is free to modify the array. It acts as a bridge between array-based and collection-based APIs.
Parameters: It does not take in any parameter.
Return Value: It returns an array containing all the elements in the list. Below examples illustrates the LinkedList.toArray() method:
Example: toArray() – without parameter (with Integer type LinkedList)
LinkedList: [7855642, 35658786, 5278367, 74381793] After converted LinkedList to Array: 7855642 35658786 5278367 74381793
Method-2: toArray(arrayName) – with parameter
The toArray(arrayName) method method of LinkedList class in Java is used to form an array of the same elements as that of the LinkedList. It returns an array containing all of the elements in this LinkedList in the correct order; the run-time type of the returned array is that of the specified array. If the LinkedList fits in the specified array, it is returned therein. Otherwise, a new array is allocated with the run time type of the specified array and the size of this LinkedList. If the LinkedList fits in the specified array with room to spare (i.e., the array has more elements than the LinkedList), the element in the array immediately following the end of the LinkedList is set to null. (This is useful in determining the length of the LinkedList only if the caller knows that the LinkedList does not contain any null elements.)
Parameters: The method accepts one parameter arrayName which is the array into which the elements of the LinkedList are to be stored, if it is big enough; otherwise, a new array of the same runtime type is allocated for this purpose.
Return Value: The method returns an array containing the elements similar to the LinkedList.
Exception: The method might throw two types of exception:
- ArrayStoreException: When the mentioned array is of the different type and is not able to compare with the elements mentioned in the LinkedList.
- NullPointerException: If the array is Null, then this exception is thrown.
Below program illustrates the working of the LinkedList.toArray(arrayName) method.
Example: toArray(arrayName) – with parameter (with String type LinkedList)
The LinkedList: [Welcome, To, Geeks, For, Geeks] After converted LinkedList to Array: Welcome To Geeks For Geeks
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