【每日日报】第四十二天

1 今天开始整理暑假作业

 文件操作：

package Hello;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.io.PrintStream;

import java.io.FileOutputStream;

import java.io.FileNotFoundException;

public class CPP0046 {

     public static void main(String[] args){

            FileInputStream in=null;

            try{

                   in=new FileInputStream("D:/s1.txt");

                   PrintStream out=new PrintStream(new FileOutputStream("D:/d1.txt"));

                   byte[] ch=new byte[1024];

                   int len=-1;

                   String s=" ";

                   while((len=in.read(ch))!= -1){

                          s=new String(ch,0,len);

                }

                   char[] ch1=s.toCharArray();

                   for(int i=0;i<s.length();i++){

                          if((ch1[i]>='a')&&(ch1[i]<='z'))ch1[i]-=32;

                   }

                   out.println(ch1);

            }catch (IOException e){

                   System.out.println("can not open txt");

            }

    }

}

2 没有什么问题

3 明天继续整理暑假作业