Java documentation interpretation: detailed description of the stream() method of the Arrays class

The Arrays class in Java provides a series of static methods for common array operations. The stream() method is a very useful tool that can convert arrays into Java 8 Stream for more efficient processing.

Below I will explain the stream() method of the Arrays class in detail and provide specific code examples.

Syntax:

public static <T> Stream<T> stream(T[] array)

Interpretation:

This method is a static method that receives a generic array as a parameter and returns a Stream object. When you convert an array using this method, each element becomes an element of the stream.

Example:

//定义一个字符串数组
String[] strArray = {"Java", "is", "awesome"};

//使用Arrays.stream方法将数组转换为Stream对象
Stream<String> strStream = Arrays.stream(strArray);

//对流中的元素进行处理
strStream.forEach(System.out::println);

After executing the above code, the console will output:

Java
is
awesome

Explanation:

In the above code, we use the static of the Arrays class The method stream() converts the string array into a Stream object, and uses the forEach() method to iterate through each element and print the element to the console. Here we use the method reference (::) syntax in Java 8 to express the output operation more concisely.

In addition to converting ordinary arrays to Streams, the stream() method of the Arrays class can also be used for arrays of basic data types. At this time we need to use the corresponding Stream object, such as IntStream, LongStream, etc. An example of IntStream is provided below:

//定义一个int类型的数组
int[] intArray = {1, 2, 3, 4, 5};

//使用Arrays.stream方法将数组转换为IntStream对象
IntStream intStream = Arrays.stream(intArray);

//对流中的元素进行处理
intStream.map(i -> i * 2).forEach(System.out::println);

Interpretation:

The above code converts an array of int type into an IntStream object, processes each element in the stream, and doubles the result output.

Summary:

The stream() method of the Arrays class is a convenient and efficient array conversion tool that can convert ordinary arrays or arrays of basic data types into corresponding Stream objects. Using this method can operate and process the elements in the array more efficiently.

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