Tips for quickly converting Java arrays into Lists

Techniques for quickly converting Java arrays into Lists require specific code examples

In Java programming, we often encounter the need to convert arrays into Lists. Using List can operate elements more flexibly and provides more methods and functions. The following will introduce several techniques for quickly converting Java arrays into Lists, including using the asList() method of the Arrays class, using the ArrayList constructor, and using the Stream stream in Java 8.

Method 1: Use the asList() method of the Arrays class
Using the asList() method of the Arrays class is one of the simplest and most commonly used methods to convert an array into a List. It can quickly convert an array into a fixed-length List. You can directly use the Arrays.asList() method to convert. The code is as follows:

String[] array = {"apple", "banana", "cherry"};
List<String> list = Arrays.asList(array);

In this way, the array array can be converted into a length of 3 List, where each element corresponds to an element in the array.

It should be noted that the List returned by the asList() method is a view list, its size is fixed, and operations such as insertion and deletion cannot be performed. If you need to modify the List, you can use the constructor of the ArrayList class for conversion.

Method 2: Use the constructor of ArrayList
Since the constructor of the ArrayList class accepts a Collection type parameter, you can use this feature to convert the array into a List. The following is a sample code:

String[] array = {"apple", "banana", "cherry"};
List<String> list = new ArrayList<>(Arrays.asList(array));

This method will create a new ArrayList object, which contains a copy of the array elements. In this way, modification operations can be performed on the List without affecting the original array.

Method 3: Using Stream in Java 8
Java 8 introduces the concept of Stream, which provides a more intuitive and concise way to process collections. It is very convenient to use Stream to convert an array into a List. The following is a sample code:

String[] array = {"apple", "banana", "cherry"};
List<String> list = Stream.of(array).collect(Collectors.toList());

This method uses the Stream.of() method to convert the array into a Stream, and then uses the collect() method to collect the stream into a List. The advantage of using Stream is that you can perform more operations on collections, such as filtering, mapping, etc.

It should be noted that the above three methods are all common ways to convert an array into a List. Which method to use depends on the specific needs and environment. In addition, if the elements in the array are of basic data types, they can be packaged into the corresponding packaging class first and then converted.

To sum up, the above are several techniques for quickly converting Java arrays into Lists, and specific code examples are given. These methods can improve programming efficiency and facilitate conversion between arrays and lists in our daily development.

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