Java by API/java.io/FileReader

FileReader: read()

 
/*
 * 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);
    }
  }
}

FileReader: read(char[] cbuf)

 
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);
  }
}

new FileReader(String name)

 
/*
 * 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);
    }
  }
}