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Java LinkedList boolean remove(Object o) method with Example

Java LinkedList boolean remove(Object o) method: Here, we are going to learn about the boolean remove(Object o) method of LinkedList class with its syntax and example.
Submitted by Preeti Jain, on June 15, 2019

LinkedList boolean remove(Object o) method

• This method is available in package java.util.Collection and here, Collection is an interface.
• This method is declared in interface Collection and it is implemented by the class LinkedList.
• This method is used to remove the first occurrence of the specified object at the from the beginning of the linked list.

Syntax:

    boolean remove(Object o){
    }

Parameter(s):

We can pass only one object as a parameter in the method and that object will remove at the beginning of the linked list.

Return value:

The return type of this method is boolean that means this method returns true after execution.

Java program to demonstrate example of LinkedList remove(Object o) method

Case 1: How boolean remove(Object o) method works without duplicate objects in the LinkedList?

import java.util.LinkedList;

public class LinkList{
	public static void main(String[] args){
	LinkedList  list = new LinkedList();
	// use add() method to add few elements in the list 
	list.add(10); 
	list.add(20); 
	list.add(30); 
	list.add(40); 
	list.add(50); 

	//  Current list Output
	System.out.println("The Current list is:" + list); 

	// Remove one element of index 1(i.e 20) from the list 
	list.remove(1); 

	//  New list Output 
	System.out.println("The new List is:" + list); 
	}
}

Output

The Current list is:[10, 20, 30, 40, 50]
The new List is:[10, 30, 40, 50]

Case 2: How boolean remove(Object o) method works with duplicate objects in the list?

import java.util.LinkedList;

public class LinkList{
	public static void main(String[] args){
		LinkedList  list = new LinkedList();
		// use add() method to add few elements in the list 
		list.add("J"); 
		list.add("A"); 
		list.add("V"); 
		list.add("A"); 
		list.add("L");
		list.add("A"); 
		list.add("N");
		list.add("G");
		list.add("U");
		list.add("A"); 
		list.add("G");
		list.add("E");

		//  Current list Output
		System.out.println("The Current list is:" + list); 

		// Remove one elements from the list and here A 
		// comes four times in a list so it will remove 
		//first occurrence of  A will remove from the list 
		list.remove("A"); 

		//  New list Output 
		System.out.println("The new List is:" + list); 
	}
}

Output

The Current list is:[J, A, V, A, L, A, N, G, U, A, G, E]
The new List is:[J, V, A, L, A, N, G, U, A, G, E]