ByteBuffer: capacity() : ByteBuffer « java.nio « Java by API






ByteBuffer: capacity()

   
/*
 * Output:
File stream created successfully.
New buffer:           position = 0  Limit = 1024  capacity = 1024
Buffer after loading: position = 30  Limit = 1024  capacity = 1024
Buffer after flip:    position = 0  Limit = 30  capacity = 1024
Buffer contents written to file.
 */

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.FileNotFoundException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class MainClass {
  public static void main(String[] args) {
    String phrase = new String("www.java2s.com\n");

    File aFile = new File("test.txt");   
    FileOutputStream outputFile = null;  
    try {
      outputFile = new FileOutputStream(aFile, true);
      System.out.println("File stream created successfully.");
    } catch (FileNotFoundException e) {
      e.printStackTrace(System.err);
    } 

    FileChannel outChannel = outputFile.getChannel();
    
    ByteBuffer buf = ByteBuffer.allocate(1024);
    System.out.println("New buffer:           position = " + buf.position()
                       + "\tLimit = " + buf.limit() + "\tcapacity = "
                       + buf.capacity());

    // Load the data into the buffer
    for (char ch : phrase.toCharArray()) {
      buf.putChar(ch);
    }
    System.out.println("Buffer after loading: position = " + buf.position()
                       + "\tLimit = " + buf.limit() + "\tcapacity = "
                       + buf.capacity());
    buf.flip();
    System.out.println("Buffer after flip:    position = " + buf.position() 
                       + "\tLimit = " + buf.limit() + "\tcapacity = " 
                       + buf.capacity());

    try {
      outChannel.write(buf);
      outputFile.close();
      System.out.println("Buffer contents written to file.");
    } catch (IOException e) {
      e.printStackTrace(System.err);
    }
  }
}


           
         
    
    
  








Related examples in the same category

1.ByteBuffer: allocate(int capacity)
2.ByteBuffer: allocateDirect(int size)
3.ByteBuffer: asCharBuffer()
4.ByteBuffer: asDoubleBuffer()
5.ByteBuffer: asFloatBuffer()
6.ByteBuffer: asLongBuffer()
7.ByteBuffer: asShortBuffer()
8.ByteBuffer: clear()
9.ByteBuffer: compact()
10.ByteBuffer: flip()
11.ByteBuffer: get()
12.ByteBuffer: get(byte[] dst, int offset, int length)
13.ByteBuffer: get(int index)
14.ByteBuffer: getChar()
15.ByteBuffer: getDouble()
16.ByteBuffer: getFloat()
17.ByteBuffer: getInt()
18.ByteBuffer: getLong()
19.ByteBuffer: isDirect()
20.ByteBuffer: limit()
21.ByteBuffer: order()
22.ByteBuffer: order(ByteOrder bo)
23.ByteBuffer: position()
24.ByteBuffer: position(int newPosition)
25.ByteBuffer: put(byte b)
26.ByteBuffer: putChar(char ch)
27.ByteBuffer: putDouble(double value)
28.ByteBuffer: putFloat(float value)
29.ByteBuffer: putInt(int i)
30.ByteBuffer: putLong(long value)
31.ByteBuffer: putShort(short value)
32.ByteBuffer: putShort(int index, short value)
33.ByteBuffer: rewind()
34.ByteBuffer: wrap(byte[] array)