70 lines
2.2 KiB
Java
70 lines
2.2 KiB
Java
// newio/ViewBuffers.java
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// (c)2021 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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import java.nio.*;
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public class ViewBuffers {
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public static void main(String[] args) {
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ByteBuffer bb = ByteBuffer.wrap(
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new byte[]{ 0, 0, 0, 0, 0, 0, 0, 'a' });
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bb.rewind();
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System.out.print("Byte Buffer ");
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while(bb.hasRemaining())
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System.out.print(
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bb.position()+ " -> " + bb.get() + ", ");
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System.out.println();
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CharBuffer cb =
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((ByteBuffer)bb.rewind()).asCharBuffer();
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System.out.print("Char Buffer ");
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while(cb.hasRemaining())
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System.out.print(
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cb.position() + " -> " + cb.get() + ", ");
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System.out.println();
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FloatBuffer fb =
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((ByteBuffer)bb.rewind()).asFloatBuffer();
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System.out.print("Float Buffer ");
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while(fb.hasRemaining())
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System.out.print(
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fb.position()+ " -> " + fb.get() + ", ");
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System.out.println();
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IntBuffer ib =
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((ByteBuffer)bb.rewind()).asIntBuffer();
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System.out.print("Int Buffer ");
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while(ib.hasRemaining())
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System.out.print(
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ib.position()+ " -> " + ib.get() + ", ");
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System.out.println();
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LongBuffer lb =
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((ByteBuffer)bb.rewind()).asLongBuffer();
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System.out.print("Long Buffer ");
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while(lb.hasRemaining())
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System.out.print(
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lb.position()+ " -> " + lb.get() + ", ");
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System.out.println();
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ShortBuffer sb =
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((ByteBuffer)bb.rewind()).asShortBuffer();
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System.out.print("Short Buffer ");
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while(sb.hasRemaining())
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System.out.print(
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sb.position()+ " -> " + sb.get() + ", ");
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System.out.println();
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DoubleBuffer db =
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((ByteBuffer)bb.rewind()).asDoubleBuffer();
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System.out.print("Double Buffer ");
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while(db.hasRemaining())
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System.out.print(
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db.position()+ " -> " + db.get() + ", ");
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}
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}
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/* Output:
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Byte Buffer 0 -> 0, 1 -> 0, 2 -> 0, 3 -> 0, 4 -> 0, 5
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-> 0, 6 -> 0, 7 -> 97,
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Char Buffer 0 -> NUL, 1 -> NUL, 2 -> NUL, 3 -> a,
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Float Buffer 0 -> 0.0, 1 -> 1.36E-43,
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Int Buffer 0 -> 0, 1 -> 97,
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Long Buffer 0 -> 97,
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Short Buffer 0 -> 0, 1 -> 0, 2 -> 0, 3 -> 97,
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Double Buffer 0 -> 4.8E-322,
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*/
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