import java.io.*;
import java.util.Scanner;


public class ScanXan {
    public static void main(String[] args) throws IOException {
        Scanner s = null;
        try {
            s = new Scanner(new BufferedReader(new FileReader("yourFile.txt")));
            while (s.hasNext())
            {
               String str = s.next(); 
                char[] myChar = str.toCharArray();
                // do something
            }
        } finally {
            if (s != null) {
                s.close();
            }
        }
    }

package com.stackoverflow.api;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;
import java.util.concurrent.Callable;

public class Human13370154 {

  public static void convertToArrayOfCharsAndPrint(String str1)
    throws IOException {
    Scanner s = null;
    try {
      s = new Scanner(new BufferedReader(new FileReader(str1)));
      while (s.hasNext()) {
        String str = s.next();
        char[] myChar = str.toCharArray();
        // do something
      }
    } finally {
      if (s != null) {
        s.close();
      }
    }
  }
}

package com.stackoverflow.api;

import java.io.*;
import java.util.Scanner;

/**
 * How to read an input file char by char using a Scanner?
 *
 * @author APIzator
 * @see <a href="https://stackoverflow.com/a/13370154">https://stackoverflow.com/a/13370154</a>
 */
public class APIzator13370154 {

  public static void readChar(String str1) throws IOException {
    Scanner s = null;
    try {
      s = new Scanner(new BufferedReader(new FileReader(str1)));
      while (s.hasNext()) {
        String str = s.next();
        char[] myChar = str.toCharArray();
        // do something
      }
    } finally {
      if (s != null) {
        s.close();
      }
    }
  }
}