The
removeIf() method of
ArrayDeque is used to remove all those elements from ArrayDeque which satisfies a given predicate filter condition passed as a parameter to the method. This method returns true if some element are removed from the Vector.
Java 8 has an important in-built functional interface which is
Predicate. Predicate, or a condition checking function, which checks the given input for a given condition and returns a boolean result for the same indicating whether the condition was met or not.
Syntax:
public boolean removeIf(Predicate<? super E> filter)
Parameter: This method takes a parameter
filter which represents a predicate which returns true for elements to be removed.
Returns: This method returns
True if predicate returns true and some elements were removed.
Exception: This method throws
NullPointerException if the specified filter is null.
Below programs illustrate removeIf() method of ArrayDeque:
Example 1: To demonstrate removeIf() method on ArrayDeque which contains a set of String and remove strings starts with A.
Output:
Students name do not starts with A
Sanjeet
Rabi
Shabbir
Example 2: To demonstrate removeIf() method on ArrayDeque which contains set of Students objects to remove all those students who got less than 40 marks.
Output:
Students list who score above 40
Aman, 78
Amar, 79
Ankit, 76
Sanju, 62
Example 3: To demonstrate NullpointerException in removeIf() method.
