Java——》Stream,IntStream,LongStream,DoubleStream

悠悠 2024-01-27 06:00 150阅读 0赞

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[https://blog.csdn.net/weixin\_43453386/article/details/88668714][https_blog.csdn.net_weixin_43453386_article_details_88668714]

#### Java——》IntStream,LongStream,DoubleStream ####

*  一、常用方法
 *  二、示例

> 流的生成方式，请参考 [https://blog.csdn.net/weixin\_43453386/article/details/88643166][https_blog.csdn.net_weixin_43453386_article_details_88643166]  
>   
>   
> 以下三种流都是在**java.util.stream**空间下

<table> 
 <thead> 
  <tr> 
   <th>序号</th> 
   <th>类型</th> 
   <th>类</th> 
   <th>说明</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>1</td> 
   <td>int</td> 
   <td>IntStream</td> 
   <td>原始整数值序列</td> 
  </tr> 
  <tr> 
   <td>2</td> 
   <td>long</td> 
   <td>LongStream</td> 
   <td>原始长整型值序列</td> 
  </tr> 
  <tr> 
   <td>3</td> 
   <td>double</td> 
   <td>DoubleStream</td> 
   <td>原始双精度浮点型序列</td> 
  </tr> 
 </tbody> 
</table>

## 一、常用方法 ##

<table> 
 <thead> 
  <tr> 
   <th>序号</th> 
   <th align="left">方法</th> 
   <th align="left">说明</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>1</td> 
   <td align="left">rangeClosed(a,b)</td> 
   <td align="left">返回子序列 [a,b]，左闭右闭（包括 b 元素，增长步值为 1）</td> 
  </tr> 
  <tr> 
   <td>2</td> 
   <td align="left">range(a,b)</td> 
   <td align="left">返回子序列 [a,b)，左闭右开（不包括 b）</td> 
  </tr> 
  <tr> 
   <td>3</td> 
   <td align="left">sum</td> 
   <td align="left">计算总和</td> 
  </tr> 
  <tr> 
   <td>4</td> 
   <td align="left">sorted</td> 
   <td align="left">排序</td> 
  </tr> 
  <tr> 
   <td>5</td> 
   <td align="left">toArray</td> 
   <td align="left">流转为数组</td> 
  </tr> 
  <tr> 
   <td>6</td> 
   <td align="left">max</td> 
   <td align="left">最大值</td> 
  </tr> 
  <tr> 
   <td>7</td> 
   <td align="left">min</td> 
   <td align="left">最小值</td> 
  </tr> 
  <tr> 
   <td>8</td> 
   <td align="left">average</td> 
   <td align="left">平均值</td> 
  </tr> 
 </tbody> 
</table>

## 二、示例 ##

import java.util.stream.IntStream;
    import java.util.stream.LongStream;
    
    public class T {
        
        public static void main(String[] args) {
        
            System.out.println("**********IntStream start**********");
            //12345
            IntStream.rangeClosed(1, 5).forEach(e->System.out.print(e));
            System.out.println();
            //1234
            IntStream.range(1,5).forEach(e->System.out.print(e));
            System.out.println();
            //1+2+3+4+5=15
            System.out.println(IntStream.rangeClosed(1,5).sum());
            //2 4 8 13 15
            IntStream.of(13,4,15,2,8).sorted().forEach(s->System.out.println(s ));
            System.out.println(IntStream.of(13,4,15,2,8).toArray());
            System.out.println("**********IntStream end**********");
    
    
    
            System.out.println("**********LongStream start**********");
            //12345
            LongStream.rangeClosed(1, 5).forEach(e->System.out.print(e));
            System.out.println();
            //1234
            LongStream.range(1,5).forEach(e->System.out.print(e));
            System.out.println();
            //1+2+3+4+5=15
            System.out.println(IntStream.rangeClosed(1,5).sum());
            //2 4 8 13 15
            LongStream.of(13,4,15,2,8).sorted().forEach(s->System.out.println(s ));
            System.out.println("**********LongStream end**********");
    
    
    
            System.out.println("**********DoubleStream start**********");
            //13.3
            System.out.println(DoubleStream.of(12.2,11.1,13.3).max().getAsDouble());
            //11.1
            System.out.println(DoubleStream.of(12.2,11.1,13.3).min().getAsDouble());
            //12.20
            System.out.println(DoubleStream.of(12.2,11.1,13.3).average().getAsDouble());
            System.out.println("**********DoubleStream end**********");
        }
    }

[https_blog.csdn.net_weixin_43453386_article_details_88668714]: https://blog.csdn.net/weixin_43453386/article/details/88668714
[https_blog.csdn.net_weixin_43453386_article_details_88643166]: https://blog.csdn.net/weixin_43453386/article/details/88643166

Java——》Stream,IntStream,LongStream,DoubleStream

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