testStaic.txt

package org.rui.io.util;import java.io.BufferedReader;import java.io.File;import java.io.FileReader;import java.io.PrintWriter;import java.util.ArrayList;import java.util.Arrays;import java.util.TreeSet;public class TextFile  extends ArrayList<String>{			public static String read(String fileName)	{		StringBuilder sb=new StringBuilder();				try {			BufferedReader in=new BufferedReader(					new FileReader(							new File(fileName).getAbsoluteFile())					);						try {				String s;				while((s=in.readLine())!=null)					sb.append(s);					sb.append("\n");							} finally			{				in.close();			}		} catch (Exception e) {			throw new RuntimeException(e);		}		return sb.toString();	}	// write a single	public static void write(String fileName,String text)	{		try {			PrintWriter out=new PrintWriter(					new File(fileName).getAbsoluteFile()					);			try {				out.print(text);							}finally			{				out.close();			}		} catch (Exception e) {			throw new RuntimeException(e);		}					}		// read a file	public TextFile(String fileName,String splitter)	{		super(Arrays.asList(read(fileName).split(splitter)));		if(get(0).equals("")) remove(0);	}	public TextFile(String fileName)	{		this(fileName,"\n");	}		public void write(String fileName)	{		try {			PrintWriter out=new PrintWriter(					new File(fileName).getAbsoluteFile()					);			try {				for(String item:this)				 out.println(item);			} finally			{				out.close();			}		} catch (Exception e) {			throw new RuntimeException(e);		}			}	/////simple test	public static void main(String[] args) {		//路径根据自已的改		String path="D:\\Users\\liangrui\\workspace\\thinking\\src\\org\\rui\\io\\util/";				//写入文件		String file =read(path+"TextFile.java");		write("testStaic.txt",file);		//对象 写		TextFile tf=new TextFile(path+"text.txt");		tf.write(path+"test2.txt");				TreeSet<String> words=new TreeSet<String>(				new TextFile("TextFile.java","\\w+")				);		//headSet 返回此 set 的部分视图，其元素严格小于  toElement。		System.out.println(words.headSet("a"));			}}