Program/Source Code:

The source code to get the head item from the LinkedList using peek(), peekFirst() methods is given below. The given program is compiled and executed successfully.

// Java program to get the head item from the LinkedList 
// without removing it

import java.util.LinkedList;

public class Main {
  public static void main(String[] args) {
    LinkedList list = new LinkedList();

    list.add(1);
    list.add("TWO");
    list.add(3);
    list.add("FOUR");
    list.add(true);

    System.out.println("List Items: \n" + list);
    System.out.println("Head Item: " + list.peek());
    System.out.println("Head Item: " + list.peekFirst());

  }
}

Output:

List Items: 
[1, TWO, 3, FOUR, true]
Head Item: 1
Head Item: 1

Explanation:

In the above program, we imported the "java.util.LinkedList" package to use the LinkedList collection class. Here we created a class Main. The Main class contains a main() method. The main() method is the entry point for the program.

In the main() method, we created an object of the LinkedList collection class to store different types of elements. Then we get the first element from the linked list using the peek() method of LinkedList and printed the result.