IO题目

 

题目：文件intel.txt,内容如下： 

小王【空格】10000【回车】 
小强【空格】12345【回车】 
小张【空格】2342 【回车】 
小强【空格】1030 【回车】 
小周【空格】1020 【回车】 

请编写一程序从test.txt中读取数据，并按数字大小排序后写入另一文件sun.txt(写入格式同上) 

 

 

package com.io;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class Test3 {
	
	public static void main(String[] args) {
		//read

		try {
			List<Person> persons = new ArrayList<Person>();
			BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream("e://test.txt"),"Utf-8"));
			String line = null;
			while((line = in.readLine())!= null){
				String[] temp = line.split(" ");
				persons.add(new Person(Integer.valueOf(temp[1]),temp[0]));
			}
			in.close();
			//sort
			Collections.sort(persons, new Comparator<Person>() {
				public int compare(Person o1, Person o2){
					return o1.getId().compareTo(o2.getId());
				}
			});
			
			//write
			
			BufferedWriter out = new BufferedWriter( new OutputStreamWriter(new FileOutputStream("e:/sun.txt"), "UTF-8"));
			
			for(Person person : persons){
				String s = person.getName() + " " + person.getId();
				System.out.println(s);
				out.write(s+"\r\n");
             
			}
		
			out.flush();
			out.close();
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

class Person{
	Integer id;
	String name;
	public Person(Integer id, String name) {
		super();
		this.id = id;
		this.name = name;
	}
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	
}