Detailed explanation of the implementation method of converting Java array into List

Detailed explanation of how to convert a Java array into a List

In Java programming, we often encounter the need to convert an array into a List. Java provides a variety of flexible ways to implement this operation. This article will introduce several commonly used methods in detail and give specific code examples.

1. Use the asList method of the Arrays tool class
   The Arrays tool class is a tool class provided by Java for operating arrays. The asList method can convert an array into the corresponding List. The following is a code example using this method:

import java.util.Arrays;
import java.util.List;

public class ArrayToListExample {
    public static void main(String[] args) {
        String[] array = {"apple", "banana", "orange"};
        List<String> list = Arrays.asList(array);
        System.out.println(list);
    }
}

The running result is: [apple, banana, orange].

It should be noted that the asList method returns a fixed-length List and cannot be added or deleted. If you need to modify the returned List, you can use the ArrayList class for conversion.

2. Using the constructor of ArrayList
   ArrayList is a commonly used class in the Java collection framework. It implements the List interface and provides a wealth of operation methods. The constructor of ArrayList can accept an array as a parameter to convert the array into a List. The following is a code example using this method:

import java.util.ArrayList;
import java.util.List;

public class ArrayToListExample {
    public static void main(String[] args) {
        String[] array = {"apple", "banana", "orange"};
        List<String> list = new ArrayList<>(Arrays.asList(array));
        System.out.println(list);
    }
}

The running result is: [apple, banana, orange].

Using the construction method of ArrayList can easily convert an array into a List, and the returned List can be added or deleted.

3. Use the addAll method of the Collections tool class
   The Collections tool class is a tool class provided in the Java collection framework to operate collections. The addAll method can add an array to a List. The following is a code example using this method:

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class ArrayToListExample {
    public static void main(String[] args) {
        String[] array = {"apple", "banana", "orange"};
        List<String> list = new ArrayList<>();
        Collections.addAll(list, array);
        System.out.println(list);
    }
}

The running result is: [apple, banana, orange].

By using the addAll method of the Collections tool class, we can add the array to an empty List, thus converting the array into a List.

The above are several commonly used methods and code examples for converting Java arrays into Lists. According to actual needs, choosing an appropriate method to convert an array to a List can improve the readability and flexibility of the code. I hope this article can help you understand and use these conversion methods!

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