面试题

package com.suypower.chengyu.test;

import java.awt.image.DataBuffer;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.*;

import javax.servlet.http.HttpServlet;
/*
 * 一个数组 写入 文件 然后 逆顺序读取
 */
public class CalculateTheResult{
	public static void main(String[] args)throws Exception
	{
		int array[] ={1,2,3,4,5,6,7};
		FileOutputStream fos = new FileOutputStream("data.dat");
		DataOutputStream dos = new DataOutputStream(fos);
		for(int i=0;i<array.length;i++)
		{
			dos.writeUTF(String.valueOf(array[i]));
		}
		try {
			BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("data.dat")));
			String str = br.readLine();
			StringBuffer sb = new StringBuffer(str);
			String string = sb.reverse().toString();
			System.out.println("*************"+string);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}//class ends here.
========================================================================================================================================================================================
package com.suypower.chengyu.io;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.InputStreamReader;
import java.io.PrintWriter;

import org.apache.fop.render.PrintRenderer;

public class ReaderTest {
	public static void main(String[] args)throws Exception
	{
//		连接控制台输入
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		PrintWriter pw = new PrintWriter(new FileWriter("1.txt"));
		String s ="";
		System.out.println("input args ...ctrl+z 结束");
		while((s = br.readLine()) != null)
		{
			pw.println(s);
		}
		br.close();pw.close();
//		读取文件
		BufferedReader b = new BufferedReader(new InputStreamReader(new FileInputStream("1.txt")));
		String st ="";
		while(b.ready())
		{
			st += b.readLine();
		}
		System.out.println(st);
	}

}