FloatBuffer compact() method in Java With Examples
Last Updated :
06 Dec, 2018
The compact() method of java.nio.FloatBuffer Class is used to compact the given buffer.
The values between the buffer’s current position and its limit are copied to the beginning of the buffer. The buffer’s position is then set to n+1 and its limit is set to its capacity. The buffer’s position is set to the number of floats copied.
Syntax :
public abstract FloatBuffer compact()
Return Value: This method returns the new FloatBuffer with the same content as that of this buffer.
Exception: This method throws the ReadOnlyBufferException, If this buffer is read-only.
Below program illustrates the compact() method:
Examples 1:
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
int capacity = 10 ;
FloatBuffer fb = FloatBuffer.allocate(capacity);
fb.put( 8 .56F);
fb.put( 9 .61F);
fb.put( 9 .61F);
System.out.println( "Original FloatBuffer: "
+ Arrays.toString(fb.array()));
System.out.println( "Position: " + fb.position());
System.out.println( "limit: " + fb.limit());
FloatBuffer floatBuffer = fb.compact();
System.out.println( "\nCompacted FloatBuffer: "
+ Arrays.toString(floatBuffer.array()));
System.out.println( "Position: " + floatBuffer.position());
System.out.println( "limit: " + floatBuffer.limit());
floatBuffer.put( 9 .61F);
System.out.println( "\nUpdated Compacted FloatBuffer: "
+ Arrays.toString(floatBuffer.array()));
System.out.println( "Position: " + floatBuffer.position());
System.out.println( "limit: " + floatBuffer.limit());
}
}
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Output:
Original FloatBuffer: [8.56, 9.61, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
Position: 3
limit: 10
Compacted FloatBuffer: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
Position: 7
limit: 10
Updated Compacted FloatBuffer: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 9.61, 0.0, 0.0]
Position: 8
limit: 10
Examples 2:
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
int capacity = 10 ;
try {
FloatBuffer fb = FloatBuffer.allocate(capacity);
fb.put( 8 .56F);
fb.put( 9 .61F);
fb.put( 9 .61F);
fb.rewind();
FloatBuffer fb1 = fb.asReadOnlyBuffer();
System.out.print( "ReadOnlyBuffer FloatBuffer: " );
while (fb1.hasRemaining())
System.out.print(fb1.get() + ", " );
System.out.println( "" );
System.out.println( "\nPosition: " + fb.position());
System.out.println( "\nlimit: " + fb.limit());
System.out.println( "\nTrying to compact the ReadOnlyBuffer fb1" );
FloatBuffer floatBuffer = fb1.compact();
}
catch (IllegalArgumentException e) {
System.out.println( "Exception throws " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println( "Exception throws " + e);
}
}
}
|
Output:
ReadOnlyBuffer FloatBuffer: 8.56, 9.61, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
Position: 0
limit: 10
Trying to compact the ReadOnlyBuffer fb1
Exception throws java.nio.ReadOnlyBufferException
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