Java by API/java.io/FileReader

FileReader: read()

   <source lang="java">

/*

* Output:
*/

import java.io.FileReader; public class MainClass {

 public static void main(String args[]) {
   try {
     int counts[] = new int[10];
     FileReader fr = new FileReader(args[0]);
     int i;
     while ((i = fr.read()) != -1) {
       char c = (char) i;
       int k = c - "0";
       if (k >= 0 && k < 10)
         ++counts[k];
     }
     // Display digit counts
     for (int j = 0; j < 10; j++) {
       char c = (char) ("0" + j);
       System.out.print(c + "=");
       System.out.print(counts[j] + "; ");
     }
     fr.close();
   } catch (Exception e) {
     System.out.println("Exception: " + e);
   }
 }

}

 </source>
   
  
 
  

FileReader: read(char[] cbuf)

   <source lang="java">

import java.io.FileReader; public class Main {

 public static void main(String[] argv) throws Exception {
   FileReader fr = new FileReader("text.txt");
   int count;
   char chrs[] = new char[80];
   do {
     count = fr.read(chrs);
     for (int i = 0; i < count; i++)
       System.out.print(chrs[i]);
   } while (count != -1);
 }

}

 </source>
   
  
 
  

new FileReader(String name)

   <source lang="java">

/*

* Output: 
*/

import java.io.FileReader; public class MainClass {

 public static void main(String args[]) {
   try {
     int counts[] = new int[10];
     FileReader fr = new FileReader(args[0]);
     int i;
     while ((i = fr.read()) != -1) {
       char c = (char) i;
       int k = c - "0";
       if (k >= 0 && k < 10)
         ++counts[k];
     }
     // Display digit counts
     for (int j = 0; j < 10; j++) {
       char c = (char) ("0" + j);
       System.out.print(c + "=");
       System.out.print(counts[j] + "; ");
     }
     fr.close();
   } catch (Exception e) {
     System.out.println("Exception: " + e);
   }
 }

}

 </source>