Admin: 1 версия

2010-06-01T05:19:20Z

1 версия

в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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== Convert ByteBuffer to an IntBuffer ==



<source lang="java">
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
public class MainClass {
public static void main(String[] args) {
ByteBuffer bb = ByteBuffer.wrap(new byte[] { 0, 0, 0, 0, 0, 0, 0, "a" });
bb.rewind();
IntBuffer ib = ((ByteBuffer) bb.rewind()).asIntBuffer();
System.out.println("Int Buffer");
while (ib.hasRemaining())
System.out.println(ib.position() + " -> " + ib.get());
}
}
/*
*/</source>



<pre class=codeResult>Int Buffer
0 -> 0
1 -> 97</pre>

== Manipulating ints in a ByteBuffer with an IntBuffer ==



<source lang="java">
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
public class MainClass {
private static final int BSIZE = 1024;
public static void main(String[] args) {
ByteBuffer bb = ByteBuffer.allocate(BSIZE);
IntBuffer ib = bb.asIntBuffer();

ib.put(new int[] { 1, 2, 7, 9, 3, 8, 6 });

System.out.println(ib.get(3));
ib.put(3, 1811);
ib.rewind();
while (ib.hasRemaining()) {
int i = ib.get();
if (i == 0)
break; // Else we"ll get the entire buffer
System.out.println(i);
}
}
}
/*
*/</source>



<pre class=codeResult>9
1
2
7
1811
3
8
6</pre>

== Map FileChannel to an IntBuffer and read from the IntBuffer ==



<source lang="java">
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.IntBuffer;
import java.nio.channels.FileChannel;
public class MainClass {
public static void main(String[] args) throws IOException {
FileChannel fc = new FileInputStream(new File("temp.tmp")).getChannel();
IntBuffer ib = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size()).asIntBuffer();
while (ib.hasRemaining())
ib.get();
fc.close();
}
}</source>



== Put integers to a mapped IntBuffer ==



<source lang="java">
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.IntBuffer;
import java.nio.channels.FileChannel;
public class MainClass {
public static void main(String[] args) throws IOException {
FileChannel fc = new RandomAccessFile(new File("temp.tmp"), "rw").getChannel();
IntBuffer ib = fc.map(FileChannel.MapMode.READ_WRITE, 0, fc.size()).asIntBuffer();
ib.put(0);
for (int i = 1; i < 10; i++)
ib.put(ib.get(i - 1));
fc.close();
}
}</source>



== Use while loop to read an IntBuffer ==



<source lang="java">
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
public class MainClass {
public static void main(String[] args) {
ByteBuffer bb = ByteBuffer.wrap(new byte[] { 0, 0, 0, 0, 0, 0, 0, "a" });
bb.rewind();
IntBuffer ib = ((ByteBuffer) bb.rewind()).asIntBuffer();
System.out.println("Int Buffer");
while (ib.hasRemaining())
System.out.println(ib.position() + " -> " + ib.get());
}
}
/*
*/</source>



<pre class=codeResult>Int Buffer
0 -> 0
1 -> 97</pre>

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Java Tutorial/File/IntBuffer - История изменений

Admin: 1 версия

в 17:44, 31 мая 2010