Fill String to CharBuffer : CharBuffer « File « Java Tutorial

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2. File
3. CharBuffer

import java.nio.CharBuffer;

/**
 * Buffer fill/drain example. This code uses the simplest means of filling and
 * draining a buffer: one element at a time.
 */
public class MainClass {
  public static void main(String[] argv) throws Exception {
    CharBuffer buffer = CharBuffer.allocate(100);

    String string = "asdf";

    for (int i = 0; i < string.length(); i++) {
      buffer.put(string.charAt(i));
    }

    buffer.flip();
    drainBuffer(buffer);
    buffer.clear();
  }

  private static void drainBuffer(CharBuffer buffer) {
    while (buffer.hasRemaining()) {
      System.out.print(buffer.get());
    }

    System.out.println("");
  }
}