答复: 一个上机题

问题:
输入：一个txt文本文件
输出：字数总数
      排序后再输出
例如：文本的内容是：我爱大海，我爱蓝天
输出：字数总数是：6
       排序后：出现1次：大 海 蓝 天
               出现2次：我 爱
怎么实现呢？
急~~~~~~~~~~~~~~~~~~~~

用面向对象思想解决:

package com.ib.test;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class TestPool {

	public static void main(String[] args) throws FileNotFoundException{
		Scanner scan=new Scanner(new FileInputStream("f:/test.txt"));
		CharacterPool pool=new CharacterPool();
		while(scan.hasNextLine()){
			for(Character c:scan.nextLine().toCharArray()){
				pool.write(c);
			}
		}
		System.out.println("字数总数是："+pool.getCountSize());
		int i=1;
		do{
			System.out.print("出现"+i+"次:");
			System.out.println(pool.toString());
			pool=pool.getNext();
			i++;
		}while(pool!=null);
	}
}

package com.ib.test;

import java.util.LinkedList;
import java.util.List;

class CharacterPool {

	private List<Character> pool = new LinkedList<Character>();
	private CharacterPool next=null;
	
	public void write(Character c){
		if(c<'\u4e00'||c>'\u9fa5'){
			return;
		}
		if(pool.contains(c)){
			pool.remove(c);
			if(next==null){
				next=new CharacterPool();
			}
			next.write(c);
		}else{
			pool.add(c);
		}
	}
	
	public CharacterPool getNext(){
		return next;
	}
	
	public int getSize(){
		return pool.size();
	}
	
	public int getCountSize(){
		return next==null?pool.size():pool.size()+next.getCountSize();
	}
	
	@Override
	public String toString(){
		return pool.toString();
	}
}