Java documentation interpretation: Detailed explanation of the use of the add() method of the ArrayList class

Interpretation of Java documentation: Detailed explanation of the use of the add() method of the ArrayList class, specific code examples are required

In Java, ArrayList is one of the most commonly used data structures. It is a variable-length array that can store elements of different types. The add() method of ArrayList is used to add elements to the list. This article will explain the usage of the add() method in detail and provide specific code examples.

Syntax:

public boolean add(E element)

Parameters:

• element: The element to be added to the list.

Return value:

• true: if the element is added successfully.
• false: If element addition fails.

Note:

• ArrayList is a generic class, so you need to specify the type of element when using the add() method.
• add() method will add elements to the end of the list.

Code example:

import java.util.ArrayList;

public class ArrayListDemo {
    public static void main(String[] args) {
        // 创建一个空的ArrayList列表
        ArrayList<String> fruits = new ArrayList<>();

        // 向列表中添加元素
        fruits.add("Apple");
        fruits.add("Banana");
        fruits.add("Coconut");

        // 打印列表中的元素
        System.out.println("Fruits List: " + fruits);

        // 尝试向列表中添加重复的元素
        if (fruits.add("Apple")) {
            System.out.println("Added successfully!");
        } else {
            System.out.println("Add failed!");
        }

        // 打印列表中的元素
        System.out.println("Fruits List: " + fruits);
    }
}

Output result:

Fruits List: [Apple, Banana, Coconut]
Added successfully!
Fruits List: [Apple, Banana, Coconut, Apple]

In the above example, we first created an empty ArrayList list. Then, we added three elements (Apple, Banana, and Coconut) to the list using the add() method. Next, we try to add a duplicate element (Apple) to the list, and the add() method will return false. Finally, we print all elements in the list.

Summary:

• The add() method of the ArrayList class is used to add elements to the list.
• add() method will add elements to the end of the list.
• If the element is added successfully, return true; otherwise, return false.

I hope this article can help you better understand the usage of the add() method of the ArrayList class.

The above is the detailed content of Java documentation interpretation: Detailed explanation of the use of the add() method of the ArrayList class. For more information, please follow other related articles on the PHP Chinese website!