JAVA实验报告（文件的输入输出流 (I/O)）

实验内容

1. 键盘输入10个整数，从小到大进行排序。 2. 接收键盘输入的字符串，用FileInputStream类将字符串写入文件，用FileOutputStream类读出文件内容显示在屏幕上。 3. 将一个文本文件的内容按行读出，每读出一行就顺序加上行号，并写入到另一个文件中。

package test;
import java.util.Scanner;public class test1 {
          
   
     public static void main(String[] args) {
          
   
          Scanner s = new Scanner(System.in);
               int temp;
                //对数组事先声明并创建10个空间
         int[] a = new int[10];
          System.out.println("请输入10个整数（输入多了没用啊！）");
         //把输入的数存储为数组
         for (int i = 0; i < 10; i++) {
          
   
              a[i] = s.nextInt();
          }
         //排序
          for (int i = 0; i < 10; i++) {
          
   
              for (int j = i + 1; j < 10; j++) {
          
   
                 if (a[i] > a[j]) {
          
   
                      temp = a[i];
                         a[i] = a[j];
                      a[j] = temp;
                 }
             }
         }
         //输出结果
          System.out.println("排序结果是");
         for (int i = 0; i < 10; i++) {
          
   
             System.out.print(a[i] + " ");
         } 
     }
 }

package test;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
 
public class test3 {
          
   
 
    public static void main(String[] args) {
          
   
     //读写文件为重要操作，最好有异常捕获
        try {
          
   
            System.out.println("请输入:");
            //打开文件
            File myfile = new File("I:\java test 2\test\src\test\save.txt");
            byte[] outCh = new byte[100];
            int bytes = System.in.read(outCh, 0, 100);
            FileOutputStream Fout = new FileOutputStream(myfile);
            Fout.write(outCh,0,bytes);
            byte[] inCh = new byte[bytes];
            //文件输出
            System.out.println("文件输出");
            FileInputStream Fin = new FileInputStream(myfile);
            Fin.read(inCh);
            System.out.println(new String(inCh));
            
        } catch (IOException e) {
          
   
            System.out.println(e.toString());
        }
    }
}

package test;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;public class test2 {
          
   
 public static void main(String[] args) {
          
   
  String str;
  int i = 1;
  //已经写有东西的文件read.txt
  File f = new File("I:\java test 2\test\src\test\read.txt");
  FileReader fr;
  try {
          
   
   //打开写入文件read.txt的文件output.txt
   FileWriter fw = new FileWriter("I:\java test 2\test\src\test\output.txt");
   BufferedWriter bw = new BufferedWriter(fw);
   fr = new FileReader(f);
   BufferedReader br = new BufferedReader(fr);
   while (br.ready()) {
          
   
    str =  i + "、" + br.readLine();
    System.out.println(str);
    //写入并换行
    bw.write(str+"
");
    bw.flush(); 
    i++;
   }
  } catch (Exception e) {
          
   
   e.printStackTrace();
  }
 }
}