DoubleBuffer compact() method in Java With Examples
Last Updated :
04 Dec, 2018
The compact() method of java.nio.DoubleBuffer 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 DoubleBuffer compact()
Return Value: This method returns the new DoubleBuffer 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 ;
DoubleBuffer db = DoubleBuffer.allocate(capacity);
db.put( 8 .56F);
db.put( 9 .61F);
db.put( 9 .61F);
System.out.println( "Original DoubleBuffer: "
+ Arrays.toString(db.array()));
System.out.println( "Position: " + db.position());
System.out.println( "limit: " + db.limit());
DoubleBuffer DoubleBuffer = db.compact();
System.out.println( "\nCompacted DoubleBuffer: "
+ Arrays.toString(DoubleBuffer.array()));
System.out.println( "Position: " + DoubleBuffer.position());
System.out.println( "limit: " + DoubleBuffer.limit());
DoubleBuffer.put( 9 .61F);
System.out.println( "\nUpdated Compacted DoubleBuffer: "
+ Arrays.toString(DoubleBuffer.array()));
System.out.println( "Position: " + DoubleBuffer.position());
System.out.println( "limit: " + DoubleBuffer.limit());
}
}
|
Output:
Original DoubleBuffer: [8.5600004196167, 9.609999656677246, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
Position: 3
limit: 10
Compacted DoubleBuffer: [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 DoubleBuffer: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 9.609999656677246, 0.0, 0.0]
Position: 8
limit: 10
Examples 2: To show ReadOnlyBufferException
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
int capacity = 10 ;
try {
DoubleBuffer db = DoubleBuffer.allocate(capacity);
db.put( 8 .56F);
db.put( 9 .61F);
db.put( 9 .61F);
db.rewind();
DoubleBuffer db1 = db.asReadOnlyBuffer();
System.out.print( "ReadOnlyBuffer DoubleBuffer: " );
while (db1.hasRemaining())
System.out.print(db1.get() + ", " );
System.out.println( "" );
System.out.println( "\nPosition: " + db.position());
System.out.println( "\nlimit: " + db.limit());
System.out.println( "\nTrying to compact the ReadOnlyBuffer db1" );
DoubleBuffer DoubleBuffer = db1.compact();
}
catch (IllegalArgumentException e) {
System.out.println( "Exception throws " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println( "Exception throws " + e);
}
}
}
|
Output:
ReadOnlyBuffer DoubleBuffer: 8.5600004196167, 9.609999656677246, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
Position: 0
limit: 10
Trying to compact the ReadOnlyBuffer db1
Exception throws java.nio.ReadOnlyBufferException
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