LongBuffer compact() method in Java
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()); }} |
Output:
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); } }} |
Output:
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
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