Java by API/java.io/FileWriter

FileWriter: close()

   <source lang="java">

import java.io.File; import java.io.FileWriter; public class Main {

 public static void main(String[] args) throws Exception{
   File file = new File("user.txt");
   FileWriter writer = new FileWriter(file, true);
   writer.write("username=java;password=secret" + System.getProperty("line.separator"));
   writer.flush();
   writer.close();
 }

}

 </source>
   
  
 
  

FileWriter: flush()

   <source lang="java">

import java.io.File; import java.io.FileWriter; public class Main {

 public static void main(String[] args) throws Exception{
   File file = new File("user.txt");
   FileWriter writer = new FileWriter(file, true);
   writer.write("username=java;password=secret" + System.getProperty("line.separator"));
   writer.flush();
   writer.close();
 }

}

 </source>
   
  
 
  

FileWriter: write(int i)

   <source lang="java">
 

/*

* Output:
*  
*/

import java.io.FileReader; import java.io.FileWriter; //copy file public class MainClass {

 public static void main(String args[]) {
   try {
     FileReader fr = new FileReader(args[0]);
     FileWriter fw = new FileWriter(args[1]);
     int i;
     while ((i = fr.read()) != -1) {
       fw.write(i);
     }
     fw.close();
     fr.close();
   } catch (Exception e) {
     System.out.println("Exception: " + e);
   }
 }

}

 </source>
   
  
 
  

new FileWriter(File file)

   <source lang="java">

import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; public class Main {

 public static void main(String[] args) throws IOException {
   File inputFile = new File("farrago.txt");
   File outputFile = new File("outagain.txt");
   FileReader in = new FileReader(inputFile);
   FileWriter out = new FileWriter(outputFile);
   int c;
   while ((c = in.read()) != -1)
     out.write(c);
   in.close();
   out.close();
 }

}

 </source>
   
  
 
  

new FileWriter("LPT1:")

   <source lang="java">
 

import java.io.FileWriter; import java.io.IOException; import java.io.PrintWriter; public class MainClass {

 public static void main(String[] args) {
   try {
     FileWriter fw = new FileWriter("LPT1:");
     PrintWriter pw = new PrintWriter(fw);
     String s = "www.jexp.ru";
     int i, len = s.length();
     for (i = 0; len > 80; i += 80) {
       pw.print(s.substring(i, i + 80));
       pw.print("\r\n");
       len -= 80;
     }
     if (len > 0) {
       pw.print(s.substring(i));
       pw.print("\r\n");
     }
     pw.close();
   } catch (IOException e) {
     System.out.println(e);
   }
 }

}

 </source>
   
  
 
  

new FileWriter(String fileName, boolean append)

   <source lang="java">
 

import java.io.BufferedWriter; import java.io.FileWriter; public class Main {

 public static void main(String[] argv) throws Exception {
   BufferedWriter out = new BufferedWriter(new FileWriter("filename", true));
   out.write("aString");
   out.close();
 }

}

 </source>
   
  
 
  

new FileWriter(String string)

   <source lang="java">
 

/*

* Output:
*  
*/

import java.io.FileReader; import java.io.FileWriter; //copy file public class MainClass {

 public static void main(String args[]) {
   try {
     FileReader fr = new FileReader(args[0]);
     FileWriter fw = new FileWriter(args[1]);
     int i;
     while ((i = fr.read()) != -1) {
       fw.write(i);
     }
     fw.close();
     fr.close();
   } catch (Exception e) {
     System.out.println("Exception: " + e);
   }
 }

}

 </source>