The compact() method of java.nio.LongBuffer 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 LongBuffer compact()
Return Value: This method returns the new LongBuffer 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:
// Java program to demonstrate // compact() method import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the LongBuffer
int capacity = 10 ;
// Creating the LongBuffer
// creating object of Longbuffer
// and allocating size capacity
LongBuffer ib = LongBuffer.allocate(capacity);
// putting the value in Longbuffer
ib.put( 8 );
ib.put( 9 );
ib.put( 9 );
// prLong the LongBuffer
System.out.println( "Original LongBuffer: "
+ Arrays.toString(ib.array()));
System.out.println( "Position: " + ib.position());
System.out.println( "limit: " + ib.limit());
// Creating a compacted LongBuffer of same LongBuffer
// using compact() method
LongBuffer LongBuffer = ib.compact();
// prLong the LongBuffer
System.out.println( "\nCompacted LongBuffer: "
+ Arrays.toString(LongBuffer.array()));
System.out.println( "Position: " + LongBuffer.position());
System.out.println( "limit: " + LongBuffer.limit());
// putting the value in compacted Longbuffer
LongBuffer.put( 9 );
// prLong the LongBuffer
System.out.println( "\nUpdated Compacted LongBuffer: "
+ Arrays.toString(LongBuffer.array()));
System.out.println( "Position: " + LongBuffer.position());
System.out.println( "limit: " + LongBuffer.limit());
}
} |
Original LongBuffer: [8, 9, 9, 0, 0, 0, 0, 0, 0, 0] Position: 3 limit: 10 Compacted LongBuffer: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0] Position: 7 limit: 10 Updated Compacted LongBuffer: [0, 0, 0, 0, 0, 0, 0, 9, 0, 0] Position: 8 limit: 10
Examples 2:
// Java program to demonstrate // compact() method import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the LongBuffer
int capacity = 10 ;
// Creating the LongBuffer
try {
// creating object of LongBuffer
// and allocating size capacity
LongBuffer ib = LongBuffer.allocate(capacity);
// putting the value in Longbuffer
ib.put( 8 );
ib.put( 9 );
ib.put( 9 );
ib.rewind();
// Creating a read-only copy of LongBuffer
// using asReadOnlyBuffer() method
LongBuffer ib1 = ib.asReadOnlyBuffer();
// prLong the ReadOnlyBuffer
System.out.print( "ReadOnlyBuffer LongBuffer: " );
while (ib1.hasRemaining())
System.out.print(ib1.get() + ", " );
System.out.println( "" );
// prLong the Position of LongBuffer ib
System.out.println( "\nPosition: " + ib.position());
// prLong the Limit of LongBuffer ib
System.out.println( "\nlimit: " + ib.limit());
// Creating a compacted LongBuffer of same ReadOnlyBuffer
// using compact() method
System.out.println( "\nTrying to compact the ReadOnlyBuffer ib1" );
LongBuffer LongBuffer = ib1.compact();
}
catch (IllegalArgumentException e) {
System.out.println( "Exception throws " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println( "Exception throws " + e);
}
}
} |
ReadOnlyBuffer LongBuffer: 8, 9, 9, 0, 0, 0, 0, 0, 0, 0, Position: 0 limit: 10 Trying to compact the ReadOnlyBuffer ib1 Exception throws java.nio.ReadOnlyBufferException