Java/File Input Output/InputStreamReader

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Create BufferedReader from InputStreamReader

   <source lang="java">

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import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class Standard {

 public static void main(String args[]) throws IOException {
   BufferedReader cin = new BufferedReader(new InputStreamReader(System.in));
   String number;
   int total = 0;
   while ((number = cin.readLine()) != null) {
     try {
       total += Integer.parseInt(number);
     } catch (NumberFormatException e) {
       System.err.println("Invalid number in input");
       System.exit(1);
     }
   }
   System.out.println(total);
 }

}

 </source>
   
  
 
  



Create BufferedReader from InputStreamReader and read line by line

   <source lang="java">

import java.io.BufferedReader; import java.io.InputStreamReader; class ReadConsole {

 public static void main(String args[]) throws Exception {
   InputStreamReader isr = new InputStreamReader(System.in);
   BufferedReader br = new BufferedReader(isr);
   String s;
   while ((s = br.readLine()) != null) {
     System.out.println(s.length());
   }
   isr.close();
 }

}

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Create BufferedReader from InputStreamReader and URL

   <source lang="java">

import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.URL; public class Main {

 public static void main(String[] args) throws Exception {
   URL myURL = new URL("http://www.google.ru");
   BufferedReader so = new BufferedReader(new InputStreamReader(myURL.openStream()));
   while (true) {
     String output = so.readLine();
     if (output != null) {
       System.out.println(output);
     } else {
       break;
     }
   }
   so.close();
 }

}

 </source>
   
  
 
  



Deal with Keyboard Input with BufferedReader

   <source lang="java">

import java.io.BufferedReader; import java.io.InputStreamReader; public class Main {

 public static void main(String[] argv) throws Exception {
   System.out.print("Enter your name: ");
   InputStreamReader reader = new InputStreamReader(System.in);
   BufferedReader in = new BufferedReader(reader);
   String name = in.readLine();
   System.out.println("Hello, " + name + ". Enter three ints...");
   int[] values = new int[3];
   double sum = 0.0;
   for (int i = 0; i < values.length; i++) {
     System.out.print("Number " + (i + 1) + ": ");
     String temp = in.readLine();
     values[i] = Integer.parseInt(temp);
     sum += values[i];
   }
   System.out.println("The average equals " + sum / values.length);
 }

}

 </source>
   
  
 
  



Reading ISO Latin-1 Encoded Data

   <source lang="java">

import java.io.BufferedReader; import java.io.FileInputStream; import java.io.InputStreamReader; public class Main {

 public static void main(String[] argv) throws Exception {
   BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream("infilename"),
       "8859_1"));
   String str = in.readLine();
   System.out.println(str);
 }

}

 </source>