文本中单词统计

package word;

import java.io.BufferedReader;
import java.io.FileReader;
import java.util.*;


public class wordcount {
    public static void main(String [] args) throws Exception {

        BufferedReader br = new BufferedReader(new FileReader("D:/学习/大二选修java/fly.txt"));

        StringBuffer sb = new StringBuffer();
        String text =null;
        while ((text=br.readLine())!= null){
            sb.append(text);// 将读取出的字符追加到stringbuffer中
        }
        br.close();  // 关闭读入流

        String str = sb.toString().toLowerCase(); // 将stringBuffer转为字符并转换为小写
        String[] words = str.split("[^(a-zA-Z)]+");  // 非单词的字符来分割，得到所有单词
        Map<String ,Integer> map = new HashMap<String, Integer>() ;

        for(String word :words){
            if(map.get(word)==null){  // 若不存在说明是第一次，则加入到map,出现次数为1
                map.put(word,1);
            }else{
                map.put(word,map.get(word)+1);  // 若存在，次数累加1
            }
        }
      
        // 排序
        List<Map.Entry<String ,Integer>> list = new ArrayList<Map.Entry<String,Integer>>(map.entrySet());

        Comparator<Map.Entry<String,Integer>> comparator = new Comparator<Map.Entry<String, Integer>>() {
            public int compare(Map.Entry<String, Integer> left, Map.Entry<String, Integer> right) {
                return (left.getValue().compareTo(right.getValue()));
            }
        };
        // 集合默认升序升序
       
        Collections.sort(list,comparator);
        
       
        float sum=0;
        float a;
        float b;
        for(int i=0;i<list.size();i++) {
            if(list.get(list.size()-i-1).getKey().equals("a")||list.get(list.size()-i-1).getKey().equals("the")||list.get(list.size()-i-1).getKey().equals("and")) {
                
            }else {

                a=list.get(list.size()-i-1).getValue();
                b=sum;
                sum=a+b; 
            }
            
                
            
        }
                System.out.println("可用单词总和为："+sum);
                System.out.println("可用单词出现次数及所占百分比降序排列如下：");
               
            
        
        for(int i=0;i<list.size();i++){// 由高到低输出
            if(list.get(list.size()-i-1).getKey().equals("a")||list.get(list.size()-i-1).getKey().equals("the")||list.get(list.size()-i-1).getKey().equals("and")) {}
            else{
                System.out.println(list.get(list.size()-i-1).getKey() +":出现"+list.get(list.size()-i-1).getValue()+"次  占比"+String.format("%.2f",(list.get(list.size()-i-1).getValue()/sum)*100));
                
            }
            }
            
        }

    }

运行结果如下图所示：