Java code: How to convert array to List

How to use Java code to convert an array into a List

In Java, converting an array into a List is a very common operation. You can use Java's own Arrays class or use the Stream API introduced in Java 8 to achieve this conversion. Specific code examples are given below.

Method 1: Use the asList method of the Arrays class
The Arrays class is a tool class provided by Java for operating arrays, and the asList method can convert the array into a 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", "cherry"};
        
        // 将数组转化成List
        List<String> list = Arrays.asList(array);
        
        // 打印List中的元素
        for (String element : list) {
            System.out.println(element);
        }
    }
}

In the above code, an array array of string type is first defined, and then the asList method of the Arrays class is used to convert the array into a List. Finally, by looping over the elements in the List, print them out.

Method 2: Use the Stream API of Java 8
The Stream API introduced in Java 8 provides a more convenient method when processing collection data. To convert an array into a List, we can use the stream method in the Arrays class. 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", "cherry"};
        
        // 将数组转化成Stream，再转化成List
        List<String> list = Arrays.stream(array).collect(Collectors.toList());
        
        // 打印List中的元素
        for (String element : list) {
            System.out.println(element);
        }
    }
}

In the above code, the array is converted into a Stream by using the stream method of the Arrays class, and then the Stream is converted into a List using the collect method of the Stream class. Finally, print them out by looping through the elements in the List.

Whether you use the Arrays class or the Stream API, they all provide very convenient methods to convert arrays into Lists. By mastering these methods, we can manipulate data in arrays and lists more flexibly.

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