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Can we insert null values in a Java list?
Solution
Yes, 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.
Syntax
boolean add(E e)
Appends the specified element to the end of this list.
Type Parameter
E − The runtime type of the element.
Parameters
e − Element to be appended to this list
Returns
It returns true.
Throws
UnsupportedOperationException − If the add operation is not supported by this list
ClassCastException − If the class of the specified element prevents it from being added to this list
NullPointerException − If the specified element is null and this list does not permit null elements
IllegalArgumentException − If some property of this element prevents it from being added to this list
Example
The following example shows how to insert null values to the list using add() method.
package com.tutorialspoint;
import java.util.ArrayList;
import java.util.List;
public class CollectionsDemo {
public static void main(String[] args) {
// Create a list object
List<String> list = new ArrayList<>();
// add elements to the list
list.add("A");
list.add(null);
list.add("B");
list.add(null);
list.add("C");
// print the list
System.out.println(list);
}
}Output
This will produce the following result −
[A, null, B, null, C]
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