Arrays.stream() Method in Java

March 31, 2023 | by Arround The Web | No comments

Arrays.stream() Method in Java

While dealing with data in bulk, there can be a requirement to integrate the contained entries to give the data a proper sense or update it. For instance, appending the associated values comprising multiple data types to return the values as a whole. In such cases, the “Arrays.stream()” method in Java is of great aid in utilizing the current resources effectively.

This write-up will discuss the utilization and implementation of the “Arrays.stream()” method in Java.

What is the “Arrays.stream()” Method in Java?

The “stream(T[] array)” method of the “Arrays” class in Java returns a sequential stream of the array passed as its argument. This array can comprise multiple data types, i.e., “Integer”, “String”, etc.

Syntax

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

In this syntax:

“static” refers to the method type.
“T[ ] array” corresponds to the array of any data type.

public static Stream<T>stream(T[] array, int init, int last)

In the above syntax:

“static” signifies the method type.
“T[ ] array” points to the array of any data type.
“int init” is the start index(inclusive).
“int last” indicates the last index(exclusive).

Before heading to the examples, make sure to include the following packages to access all the classes, methods, and working with the streams, respectively:

import java.util.*;

import java.util.stream.*;

Example 1: Applying the “Arrays.stream()” Method in Java to Return a Sequential Stream of the “String” Array

In this example, the “Arrays.stream()” method can be applied to display a sequential stream of the string values accumulated in the particular array:

public class arraysstream {

public static void main(String args[]) {

String[] array = { "This", "is", "Linuxhint" };

Stream<String> streamArray = Arrays.stream(array);

streamArray.forEach((item) -> System.out.print(item + " "));

}}

According to the above code, perform the following steps:

Firstly, define a “String” array having the provided values.
In the next step, apply the “Arrays.stream()” method having the defined array as its parameter. Also, specify the array type, i.e., “String” and the return type “Stream”.
Lastly, apply the “forEach()” method to iterate along the stream and display the string values in an array in a sequential way.

Output

In this output, it can be observed that the separated string values in an array are displayed in a sequential stream.

Example 2: Applying the “Arrays.stream()” Method in Java to Return a Sequential Stream of the “Integer” Array

This example can be utilized to apply the discussed method to log a sequential stream of the “Integer” array:

public class arraystream2 {

public static void main(String args[]) {

Integer[] array = { 1, 2, 3 };

Stream<Integer> streamArray = Arrays.stream(array);

streamArray.forEach((item) -> System.out.print(item + " "));

}}

According to the above lines of code, repeat the discussed approaches for defining an array, i.e., “Integer”(in this case). After that, likewise, apply the “Arrays.stream()” method to return a sequential stream and display the integers in an array sequentially.

Output

In this outcome, it can be analyzed that the integers are displayed in a streamlined manner.

Example 3: Applying the “Arrays.stream()” Method in Java to Return a Sequential Stream of the “Specified” Values in a String Array

In this particular example, the discussed method can be implemented to return a sequential stream of the specified string values by referring to their indexes:

public class arraysstream {

public static void main(String args[]) {

String[] array = { "This", "is", "Linuxhint" };

Stream<String> streamArray = Arrays.stream(array, 0, 2);

streamArray.forEach((item) -> System.out.print(item + " "));

}}

In this code snippet:

Likewise, declare a “String” array having the provided string values.
In the next step, apply the “Arrays.stream()” method containing the specified array and the indexes of the values, respectively, as its parameters.
Note: The value against the specified end index will not be included in the resultant stream.
Finally, display the accumulated string values in a stream via the “forEach()” method.

Output

The above output indicates that since the string value “Linuxhint” is at index “2” so it is not returned in the stream.

Note: If there is a requirement to utilize both the data types, i.e., “Integer” and “String” for returning a stream, utilize the “Object” type instead.

Conclusion

The “stream(T[] array)” method of the “Arrays” class in Java returns a sequential stream of the array passed as its argument. This method can be applied to simply return a sequential stream of multiple data types and the stream of the specified values via indexing as well. This article demonstrated the implementation of the “Arrays.stream()” method in Java.

Source: linuxhint.com