1 package Aug14.IO; 2  3 import java.io.*; 4  5 public class TestIO2 { 6  7     public static void main(String[] args) { 8         File file = new File("D://Text.txt"); 9         File f1=new File("D://Test1.txt");10         File f2=new File("D://Test2.txt");11         FileReader fr = null;12         int count = 0;13         try {14             fr = new FileReader(file);15             BufferedReader br = new BufferedReader(fr);16             17             FileWriter fw1 = new FileWriter(f1);18             BufferedWriter bw1 = new BufferedWriter(fw1);19             20             FileWriter fw2 = new FileWriter(f2);21             BufferedWriter bw2 = new BufferedWriter(fw2);22             23             String s = null;24             while ((s = br.readLine()) != null) {25 26                 if (count % 2 != 0) {27                     bw1.write(s);28                     bw1.newLine();29                     //System.out.println(s);30 31                 } else {32                     bw2.write(s);33                     bw2.newLine();34                     //System.out.println(s);35                 }36 37                 count++;38             }39             40             bw1.close();41             bw2.close();42             br.close();43             fr.close();44             fw1.close();45             fw2.close();46 47         } catch (FileNotFoundException e) {48 49             e.printStackTrace();50         } catch (IOException e) {51 52             e.printStackTrace();53         }54 55     }56 57 }

 1 package Aug14.IO; 2  3 import java.io.BufferedReader; 4 import java.io.File; 5 import java.io.FileNotFoundException; 6 import java.io.FileReader; 7  8 public class TestIO3 { 9 10     public static void main(String[] args) {11         File file = new File("D://Text1.txt");12         FileReader fr = null;13         String s = null;14         int count = 0;15         int length=0;16         try {17             fr = new FileReader(file);18             BufferedReader br = new BufferedReader(fr);19             while ((s = br.readLine()) != null) {20                 int n = s.split(" ").length;21                 count =count+n;22                 length+=s.length()-n;23             }24             System.out.println("the number of words : " + count);25             System.out.println("the length of all word: " + length);26             System.out.printf("the average word length: %.2f " ,(double) length/count);27         } catch (Exception e) {28 29             e.printStackTrace();30         }31 32     }33 34 }

 1 package Aug14.IO; 2  3  4 import java.io.*; 5  6 public class Test1 { 7  8     public static void main(String[] args) { 9         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));10         File file=new File("D://Test12.txt");11         12         try {13             System.out.print("Enter a File with Path: ");14             String  filename=br.readLine();15             16             File file1=new File(filename);17             if(file1.exists()&&file1.isFile()){18                 System.out.print("Enter a word to searth: ");19                 String  word=br.readLine();20                 InputStream in=new FileInputStream(file1);21                 byte data[]=new byte [1024];22                 int len=in.read(data);23                 String s=new String (data,0,len);24                 if(s.indexOf(word)!=-1)25                 {26                     int n=s.split(word).length-1; //Word 出现个数27                     28                     System.out.println("The word is exits! count= "+n);29                     System.out.println(s);30                 31                 }32                 else33                     System.out.println("The word is not exits!");34             }35             else36                 System.out.println("The file  is not exits!");37             38         } catch (IOException e) {39 40 41         }42     }43 44 }