filedemo.java

实现了《算法设计与分析》的一次课后题

import java.io.*;


public class filedemo {

	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args)throws 
	 IOException {
	 try{
		FileReader filereader=new FileReader("D:\\wenjian.txt");
		BufferedReader reader=new BufferedReader(filereader);
		String s="";
		
		while((s=reader.readLine())!=null){//掌握这种输入方法
			      String[] str=s.split(" ");
			      for(int l=0;l<str.length;l++)
			      { int a=Integer.valueOf(str[l]);
		          System.out.println(a);}
		}
	 }catch(FileNotFoundException e){
		 System.err.println("文件没有找到！");
		 System.exit(0);
	 }
		
		RandomAccessFile rf=new RandomAccessFile("D:\\input.txt","rw");
		/**FileInputStream rt=new FileInputStream("D:\\input.txt");
		try{
	    DataInputStream r=new DataInputStream(rt);
		System.out.println(r.readDouble());
		rt.close();
		r.close();
		}catch(EOFException e){
			throw new EOFException();
		}*/
		for(int i=0;i<10;i++)
			rf.writeDouble(i*1.414);
		rf.close();
		rf=new RandomAccessFile("D:\\input.txt","rw");
		rf.seek(5*8);
		rf.writeDouble(47.0001);
		rf.close();
		rf=new RandomAccessFile("D:\\input.txt","r");
		for(int i=0;i<10;i++)
			System.out.println("value"+i+":"+rf.readDouble());
		rf.close();
	}
}