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doc: update docs/java.md (#321)

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jaywcjlove 2023-03-02 15:10:21 +08:00
parent 3087afb4ee
commit a90c8e2ed4
1 changed files with 4 additions and 2 deletions
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@ -860,6 +860,7 @@ try (InputStream inputStream = new ByteArrayInputStream(inputContent);
``` ```
### Collections 工具类 ### Collections 工具类
```java ```java
// 计算出现频率 // 计算出现频率
List<Integer> list = new ArrayList<>(); List<Integer> list = new ArrayList<>();
@ -873,6 +874,7 @@ int frequency = Collections.frequency(list, 2); // frequency = 2
``` ```
### Stream 流 ### Stream 流
```java ```java
// 统计词频 // 统计词频
List<Integer> list = new ArrayList<>(); List<Integer> list = new ArrayList<>();