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StrUtil类添加wordCount方法✒️

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This commit is contained in:
大火yzs 2021-05-04 15:03:02 +08:00
parent a1dba4f36b
commit bc9ef1994b
2 changed files with 81 additions and 0 deletions
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62
hutool-core/src/main/java/cn/hutool/core/util/StrUtil.java
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@ -1,5 +1,6 @@
package cn.hutool.core.util;
import cn.hutool.core.map.MapUtil;
import cn.hutool.core.text.CharSequenceUtil;
import cn.hutool.core.text.StrBuilder;
import cn.hutool.core.text.StrPool;
@ -9,6 +10,8 @@ import java.io.StringReader;
import java.io.StringWriter;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.Collections;
import java.util.List;
import java.util.Map;
/**
@ -469,4 +472,63 @@ public class StrUtil extends CharSequenceUtil implements StrPool {
}
return template2;
}
//------------------------------------------------------------------------ wordCount
/**
* 统计 字符串 中单词出现次数(不排序)
*
* @param str 字符串
* @param separator 分隔符
* @return Map<String, Long> 统计次数 如: {"hello":10}
* @since 5.6.5
*/
public static Map<String, Long> wordCount(String str, String separator) {
return wordCount(Collections.singletonList(str), separator);
}
/**
* 统计 字符串 中单词出现次数(根据value排序)
*
* @param str 字符串
* @param separator 分隔符
* @param isValueDesc 是否倒叙排列
* @return Map<String, Long> 统计次数 如: {"hello":10}
* @since 5.6.5
*/
public static Map<String, Long> wordCount(String str, String separator, boolean isValueDesc) {
return wordCount(Collections.singletonList(str), separator, isValueDesc);
}
/**
* 统计list中单词出现次数(不排序)
*
* @param list list容器
* @param separator 分隔符
* @return Map<String, Long> 统计次数 如: {"hello":10}
* @since 5.6.5
*/
public static Map<String, Long> wordCount(List<String> list, String separator) {
Map<String, Long> countMap = MapUtil.newHashMap();
for (String str : list) {
String[] words = str.split(separator);
for (String word : words) {
countMap.put(word, countMap.getOrDefault(word, 0L) + 1);
}
}
return countMap;
}
/**
* 统计 字符串list 中单词出现次数(根据value排序)
*
* @param list list容器
* @param separator 分隔符
* @param isValueDesc 是否根据value倒叙排列
* @return Map<String, Long> 统计次数 如: {"hello":10}
* @since 5.6.5
*/
public static Map<String, Long> wordCount(List<String> list, String separator, boolean isValueDesc) {
return MapUtil.sortByValue(wordCount(list, separator), isValueDesc);
}
}

19
hutool-core/src/test/java/cn/hutool/core/util/StrUtilTest.java
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@ -4,7 +4,9 @@ import cn.hutool.core.lang.Dict;
import org.junit.Assert;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* 字符串工具类单元测试
@ -508,4 +510,21 @@ public class StrUtilTest {
Assert.assertEquals("jackduan@163.com", StrUtil.hide("jackduan@163.com", 16, 16));
Assert.assertEquals("jackduan@163.com", StrUtil.hide("jackduan@163.com", 16, 17));
}
@Test
public void wordCountTest(){
List<String> list = new ArrayList<>();
list.add("Word Count");
list.add("Hello world");
list.add("Hello java");
list.add("Hello Hutool");
list.add("A set of tools that keep Java sweet");
Map<String, Long> listCountMap = StrUtil.wordCount(list, " ");
Assert.assertEquals(3L, listCountMap.get("Hello").longValue());
String singleton = "Can you can a can as a canner can can a can ?";
Map<String, Long> strCountMap = StrUtil.wordCount(singleton, " ");
Assert.assertEquals(5L, strCountMap.get("can").longValue());
}
}