文件输入输出操作（字符流）

package test;

import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;


public class ArraysDemo{
	public static void main(String args[]) throws IOException{
		write1();
		read1();
		write2();
		read2();
	}
	
	public static void write1() throws IOException{
		File f = new File("d:"+File.separator+"text.txt") ;		// 实例化File类的对象
		Writer out=new FileWriter(f);
		out.write("hello");
		out.close();
	}
	
	public static void write2() throws IOException{
		File f = new File("d:"+File.separator+"text.txt") ;		// 实例化File类的对象
		Writer out=new FileWriter(f,true);
		out.write("\r\nword");//\r\n换行
		out.close();
	}
	
	public static void read1() throws IOException{
		File f = new File("d:"+File.separator+"text.txt") ;		// 实例化File类的对象
		Reader input=new FileReader(f);
		char[] c=new char[1024];
		int len=input.read(c);
		input.close();
		System.out.println("read1():\n"+new String(c,0,len));
	}
	
	public static void read2() throws IOException{
		File f = new File("d:"+File.separator+"text.txt") ;		// 实例化File类的对象
		Reader input=new FileReader(f);
		int temp=0;
		List<Character> list=new ArrayList<Character>();
		while((temp=input.read())!=-1){
			list.add((char)temp);
		}
		char[] b=new char[list.size()];
		for(int i=0,j=list.size();i<j;i++){
			b[i]=list.get(i);
		}
		input.close();
		System.out.println("read2():\n"+new String(b));
	}
		
};
/**
read1():
hello
read2():
hello
hello
**/