Map或Hashtable的value排序
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我们在文本操作时，经常要用到排序 以下是我写的一个供大家参考：
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import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
public class WordSort {
public static void main(String args[]) throws IOException{
Map<string, integer=""> wordCount=new HashMap<string, integer="">();
//需要排序的文本
BufferedReader buufBufferedReader=new BufferedReader(new InputStreamReader(new FileInputStream("D:\\钱洋个人\\学术中心\\数据处理\\user_content_count.txt"), "utf-8"));
String line=null;
while((line=buufBufferedReader.readLine())!=null){
wordCount.put(line.split(" ")[0], Integer.valueOf(line.split(" ")[1]));
}
buufBufferedReader.close();
System.out.println("当前总字符的数量："+wordCount.size());
//将出现次数为1的输出
BufferedWriter Writer = new BufferedWriter( new OutputStreamWriter( new FileOutputStream( new File("D:\\钱洋个人\\学术中心\\数据处理\\wordcount_1.txt")),"utf-8"));
for (Map.Entry<string, integer=""> j : wordCount.entrySet()) {
int value = j.getValue();
if (value==1) {
Writer.append(j.getKey()+"\r\n");
}
}
Writer.close();
//将map.entrySet()转换成list
List<map.entry<string, integer="">> list = new ArrayList<map.entry<string, integer="">>(wordCount.entrySet());
Collections.sort(list, new Comparator<map.entry<string, integer="">>() {
//降序排序
public int compare(Entry<string, integer=""> o1, Entry<string, integer=""> o2) {
//return o1.getValue().compareTo(o2.getValue());
return o2.getValue().compareTo(o1.getValue());
}
});
//将排序后的值文本输出
BufferedWriter Writer1 = new BufferedWriter( new OutputStreamWriter( new FileOutputStream( new File("D:\\钱洋个人\\学术中心\\数据处理\\wordcount_gaopinci.txt")),"utf-8"));
for (int i = 0; i < list.size()*0.01; i++) {
Writer1.append(list.get(i).getKey()+"\r\n");
}
Writer1.close();
}
}
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