The removeFirstOccurrence() method is used to remove the first occurrence of an specified element in a given deque (when traversing the deque from head to tail). If the deque does not contain the element, it is unchanged. More formally, removes the first element e such that o.equals(e) (if such an element exists).
Package: java.util
Java Platform: Java SE 8
Syntax:
removeFirstOccurrence(Object o)
Parameters:
Name Description o element to be removed from this deque, if presentReturn Value:
true if the deque contained the specified element
Return Value Type: boolean
Pictorial Presentation
Example: Java ArrayDeque Class: removeFirstOccurrence() Method
import java.util.ArrayDeque;
import java.util.Deque;
public class Main {
public static void main(String[] args) {
// Create an array deque
Deque<Integer> deque = new ArrayDeque<Integer>(8);
// Use add() method to add elements in the deque
deque.add(100);
deque.add(200);
deque.add(150);
deque.add(95);
deque.add(200);
// Print all the elements of the original deque
System.out.println("Elements of the original deque:");
for (Integer number : deque) {
System.out.println("Number = " + number);
}
// removeFirstOccurrence() will remove first occurrence of element 200
deque.removeFirstOccurrence(200);
// Print all the elements available in deque
System.out.println("New deque:");
for (Integer number : deque) {
System.out.println("Number = " + number);
}
}
}
Output:
Elements of the original deque: Number = 100 Number = 200 Number = 150 Number = 95 Number = 200 New deque: Number = 100 Number = 150 Number = 95 Number = 200
Java Code Editor:
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