将一个文本文件中的信息直接输出在屏幕上 

//将一个文本文件中的信息直接输出在屏幕上
package classwork10;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class Xianshi {

    public static void main(String[] args) throws IOException {
        BufferedReader br=new BufferedReader(new FileReader("d:/xyz.txt"));
        String msg=br.readLine();
        while(msg!=null) {
            System.out.println(msg);
            msg=br.readLine();
        }
    }

}
 1 //将一个文本文件中的信息直接输出在屏幕上,并将中的小写字母改为大写
 2 package classwork10;
 3 
 4 import java.io.BufferedReader;
 5 import java.io.FileReader;
 6 import java.io.IOException;
 7 
 8 public class Xianshi {
 9 
10     public static void main(String[] args) throws IOException {
11         BufferedReader br=new BufferedReader(new FileReader("d:/xyz.txt"));
12         String msg=br.readLine();
13         while(msg!=null) {
14             System.out.println(msg.toUpperCase());
15             msg=br.readLine();
16         }
17     }
18 
19 }
 1 //由键盘输入字符串,形成一个文本文件(由多行构成)
 2 package classwork10;
 3 
 4 import java.io.File;
 5 import java.io.IOException;
 6 import java.io.PrintWriter;
 7 import java.util.Scanner;
 8 
 9 public class Jpsr {
10 
11     public static void main(String[] args) throws IOException {
12         Scanner in=new Scanner(System.in);
13         File f=new File("d:/xyz.txt");
14         PrintWriter pw=new PrintWriter(f);
15         int yes=1;
16         while(yes==1) {    
17         String a=in.next();
18         pw.write(a);
19         pw.println();
20         System.out.println("继续添加内容吗?(1/0)");
21         yes=in.nextInt();
22         }
23         pw.close();
24         in.close();
25         System.out.println("操作已完成");
26     }
27 
28 }
 1 //将一个文本文件中的信息复制到另一个文件,并将中的小写字母改为大写
 2 package classwork10;
 3 
 4 import java.io.BufferedReader;
 5 import java.io.FileReader;
 6 import java.io.IOException;
 7 import java.io.PrintWriter;
 8 
 9 public class Xianshi {
10 
11     public static void main(String[] args) throws IOException {
12         BufferedReader br=new BufferedReader(new FileReader("d:/xyz.txt"));
13         PrintWriter pw=new PrintWriter("d:/xyz_1.txt");
14         String msg=br.readLine();
15         while(msg!=null) {
16             pw.println(msg.toUpperCase());
17             msg=br.readLine();
18         }
19         pw.close();
20         System.out.println("操作已完成");
21     }
22 
23 }

 

posted @ 2020-12-20 01:27  丁帅帅dss  阅读(478)  评论(0)    收藏  举报