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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.

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