Interpretation of Java documentation: Functional analysis of the removeLast() method of the LinkedList class

Java Document Interpretation: Function Analysis of the removeLast() Method of the LinkedList Class

LinkedList is a doubly linked list implementation class in the Java collection framework, which is often used in actual development To implement data structures such as queues and stacks. Among them, the removeLast() method is an important method in the LinkedList class. This article will analyze the function of this method and provide specific code examples.

The function of the removeLast() method is to delete an element from the end of the LinkedList and return the deleted element. The following is the method signature of this method:

E removeLast()

removeLast() method has no parameters and the return type is E, which represents the type of the element being deleted.

Below we use an example to illustrate the use of the removeLast() method.

import java.util.LinkedList;

public class LinkedListDemo {
    public static void main(String[] args) {
        LinkedList<String> linkedList = new LinkedList<>();
        linkedList.add("A");
        linkedList.add("B");
        linkedList.add("C");
        
        System.out.println("LinkedList before removal: " + linkedList);
        
        String lastElement = linkedList.removeLast();
        
        System.out.println("Removed element: " + lastElement);
        System.out.println("LinkedList after removal: " + linkedList);
    }
}

In the above example, we first created a LinkedList object and added three elements "A", "B" and "C" to it. Then we call the removeLast() method to delete an element from the end of the LinkedList and save the deleted element in the variable lastElement.

Run the above code, the output is as follows:

LinkedList before removal: [A, B, C]
Removed element: C
LinkedList after removal: [A, B]

As can be seen from the output results, after calling the removeLast() method, the last element "C" in the LinkedList was successfully deleted. The element "C" is stored in the variable lastElement. "LinkedList after removal" in the output shows the elements in the LinkedList after the elements have been removed.

It should be noted that if the LinkedList is empty, that is, when no element exists, calling the removeLast() method will throw a NoSuchElementException exception. Therefore, when using the removeLast() method, you should first determine whether the LinkedList is empty.

To sum up, the removeLast() method is an important method in the Java LinkedList class. It can delete an element from the end of the LinkedList and return the deleted element. By rationally using the removeLast() method, we can flexibly operate LinkedList to meet different business needs.

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