Java DoubleStream skip() Method

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The skip() method in Java, part of the java.util.stream.DoubleStream interface, is used to discard the first n elements of the stream. This method is useful when you need to bypass a certain number of elements in a stream and process only the remaining elements.

Table of Contents

1. Introduction
2. skip() Method Syntax
3. Understanding skip()
4. Examples
   • Basic Usage
   • Using skip() with Other Stream Operations
5. Real-World Use Case
6. Conclusion

Introduction

The skip() method returns a new DoubleStream consisting of the remaining elements of the original stream after discarding the first n elements. This method is an intermediate operation, meaning it returns a new stream and does not modify the original stream.

skip() Method Syntax

The syntax for the skip() method is as follows:

DoubleStream skip(long n) 

Parameters:

• n: The number of leading elements to skip.

Returns:

• A new DoubleStream consisting of the remaining elements of the original stream after discarding the first n elements.

Throws:

• IllegalArgumentException: If n is negative.

Understanding skip()

The skip() method allows you to ignore the first n elements of a DoubleStream. This can be useful for scenarios such as pagination, where you want to process elements starting from a specific position in the stream.

Examples

Basic Usage

To demonstrate the basic usage of skip(), we will create a DoubleStream and skip the first two elements.

Example

import java.util.stream.DoubleStream; public class SkipExample { public static void main(String[] args) { DoubleStream doubleStream = DoubleStream.of(1.1, 2.2, 3.3, 4.4, 5.5); // Skip the first 2 elements DoubleStream skippedStream = doubleStream.skip(2); // Print the remaining elements skippedStream.forEach(System.out::println); } } 

Output:

3.3 4.4 5.5 

Using skip() with Other Stream Operations

This example shows how to use skip() in combination with other stream operations, such as filtering and mapping.

Example

import java.util.stream.DoubleStream; public class SkipWithOtherOperationsExample { public static void main(String[] args) { DoubleStream doubleStream = DoubleStream.of(1.0, 2.0, 3.0, 4.0, 5.0); // Skip the first 2 elements, then filter and map the remaining elements DoubleStream processedStream = doubleStream.skip(2) .filter(n -> n > 3.0) .map(n -> n * 2); // Print the processed elements processedStream.forEach(System.out::println); } } 

Output:

8.0 10.0 

Real-World Use Case

Skipping Initial Sensor Readings

In real-world applications, the skip() method can be used to ignore initial sensor readings that might be unreliable or need to be discarded.

Example

import java.util.stream.DoubleStream; public class SensorDataSkipExample { public static void main(String[] args) { DoubleStream sensorData = DoubleStream.of(25.3, 26.7, 24.8, 27.5, 30.1); // Skip the first 2 sensor readings DoubleStream reliableSensorData = sensorData.skip(2); // Process the remaining sensor readings reliableSensorData.forEach(reading -> System.out.println("Reliable reading: " + reading)); } } 

Output:

Reliable reading: 24.8 Reliable reading: 27.5 Reliable reading: 30.1 

Conclusion

The DoubleStream.skip() method is used to discard the first n elements of the stream. This method is particularly useful for scenarios where you need to process elements starting from a specific position in the stream. By understanding and using this method, you can efficiently manage and manipulate streams of double values in your Java applications.