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What is the maximum length of List in java? I mean that how many maximum elements can store in list?
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You can use the size() method of java. util. ArrayList to find the length or size of ArrayList in Java. The size() method returns an integer equal to a number of elements present in the array list.
ArrayList doesn't have length() method, the size() method of ArrayList provides the number of objects available in the collection. Array has length property which provides the length or capacity of the Array. It is the total space allocated during the intialization of the array.
Java List size() method returns the number of elements present in the ArrayList. For example, if an ArrayList has five string objects stored in it, the size method will return five.
A list can hold 1000 elements(as per the limit).
Integer.MAX_VALUE
or heap which ever is low will be the limit
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It's very likely that you will run out of heap space well before you get anywhere close to Integer.MAX_VALUE number of elements, but let's see what would happen if we had infinite memory and tried to add more than Integer.MAX_VALUE elements to a List:
1) ArrayList:
An ArrayList will try to increase its capacity:
int newCapacity = (oldCapacity * 3)/2 + 1;
This calculation will overflow and newCapacity will actually be less than Integer.MAX_VALUE. The ArrayList will then try to copy the elements in the original array to a smaller array and will hence lose elements.
2) LinkedList:
A LinkedList works a bit better once you cross the Integer.MAX_VALUE limit. It will continue to hold elements, however the size attribute will suffer from integer overflow and will affect other operations that make use of it.
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