先决条件： Java8中的流

limit(long N)是java.util.stream.Stream对象的方法。此方法以一个(长N)作为参数，并返回大小不超过N的流。如果N的值很大，则limit()在有序并行管道上可能会非常昂贵，因为limit(N)受限于返回遇到顺序中的前N个元素，而不仅仅是任何n个元素。

用法:

Stream limit(long N)

Where N is the number of elements the stream should be

limited to and this function returns new stream as output.

异常：如果N的值为负，则该函数将引发IllegalArgumentException。

下面是一些示例，可以更好地理解该功能的实现。

示例1:

// Java code to show implementation

// of limit() function

import java.util.*;

class GFG {

// Driver code

public static void main(String[] args)

{

// Creating a list of integers

List list = new ArrayList();

// adding elements in the list

list.add(-2);

list.add(0);

list.add(2);

list.add(4);

list.add(6);

list.add(8);

list.add(10);

list.add(12);

list.add(14);

list.add(16);

// setting the value of N as 4

int limit = 4;

int count = 0;

Iterator it = list.iterator();

// Iterating through the list of integers

while (it.hasNext()) {

it.next();

count++;

// Check if first four i.e, (equal to N)

// integers are iterated.

if (count > limit) {

// If yes then remove all the remaining integers.

it.remove();

}

}

System.out.print("New stream of length N"

+ " after truncation is : ");

// Displaying new stream of length

// N after truncation

for (Integer number : list) {

System.out.print(number + " ");

}

}

}

输出：

New stream of length N after truncation is : -2 0 2 4

应用：

// Java code to show the use of limit() function

import java.util.stream.Stream;

import java.util.ArrayList;

import java.util.List;

class gfg{

// Function to limit the stream upto given range, i.e, 3

public static Stream limiting_func(Stream ss, int range){

return ss.limit(range);

}

// Driver code

public static void main(String[] args){

// list to save stream of strings

List arr = new ArrayList<>();

arr.add("geeks");

arr.add("for");

arr.add("geeks");

arr.add("computer");

arr.add("science");

Stream str = arr.stream();

// calling function to limit the stream to range 3

Stream lm = limiting_func(str,3);

lm.forEach(System.out::println);

}

}

输出：

geeks

for

geeks