Java Deque removeFirstOccurrence() Method

The removeFirstOccurrence() method of Deque interface is used to remove the first occurrence of the given element from the deque. If there is no element in the deque, then it remains unchanged. It may return true if the deque contains the specified element.

Syntax:

Parameter:

The above requires only one parameter:

The element 'o' that needs to remove d from the given deque.

Return:

The above method returns true if the particular element is removed from the deque.

Throw:

ClassCastException- If the class of the given element is incompatible with the given deque.
NullPointerException- If the specified element is already null and the given deque does not allow the null elements.

Example 1

import java.util.ArrayDeque;
import java.util.Deque;

public class JavaDequeremoveFirstoccurrenceExample1 {
    public static void main(String[] args) {	
    	Deque<Character> deque = new ArrayDeque<>();
	    deque.push('d');
	    deque.push('c');
	    deque.push('b');
	    deque.push('a');
	    Boolean val = deque.removeFirstOccurrence('c');
	    System.out.println("The character is already present? "+val);
	  System.out.println("The final deque is given as : ");   
	  for (Character character : deque) {
		System.out.println(character);
	}
   }
}

Test it Now

Output:

The character is already present? true
The final deque is given as : 
a
b
d

Example 2

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequeremoveFirstoccurrenceExample2 {
    public static void main(String[] args) {	
    	Deque<Integer> deque = new ArrayDeque<>();
	    deque.push(2);
	    deque.push(5);
	    deque.push(6);
	    deque.push(7);
	    Boolean val = deque.removeFirstOccurrence(5);
	    System.out.println("The intger value is already preesnt? "+val);
	  System.out.println("The final deque is given as : ");   
	  for (Integer integer : deque) {
		System.out.println(integer);
	}
   }
}

Test it Now

Output:

The integer value is already preesnt? true
The final deque is given as : 
7
6
2

Example 3

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequeremoveFirstoccurrenceExample3 {
    public static void main(String[] args) {	
    	Deque<Float> deque = new ArrayDeque<>();
	    deque.push(66.8f);
	    deque.push(50.8f);
	    deque.push(63.4f);
	    deque.push(71.2f);
	    Boolean val = deque.removeFirstOccurrence(5);
	    System.out.println("The float value is already preesnt? "+val);
	  System.out.println("The final deque is given as : ");   
	 for (Float float1 : deque) {
		System.out.println(float1);
	}
   }
}

Test it Now

Output:

The float value is already preesnt? false
The final deque is given as : 
71.2
63.4
50.8
66.8

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