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:
// 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 FloatBuffer int capacity = 10; // Creating the FloatBuffer // creating object of floatbuffer // and allocating size capacity FloatBuffer fb = FloatBuffer.allocate(capacity); // putting the value in floatbuffer fb.put(8.56F); fb.put(9.61F); fb.put(9.61F); // print the FloatBuffer System.out.println("Original FloatBuffer: " + Arrays.toString(fb.array())); System.out.println("Position: " + fb.position()); System.out.println("limit: " + fb.limit()); // Creating a compacted FloatBuffer of same FloatBuffer // using compact() method FloatBuffer floatBuffer = fb.compact(); // print the FloatBuffer System.out.println("\nCompacted FloatBuffer: " + Arrays.toString(floatBuffer.array())); System.out.println("Position: " + floatBuffer.position()); System.out.println("limit: " + floatBuffer.limit()); // putting the value in compacted floatbuffer floatBuffer.put(9.61F); // print the FloatBuffer System.out.println("\nUpdated Compacted FloatBuffer: " + Arrays.toString(floatBuffer.array())); System.out.println("Position: " + floatBuffer.position()); System.out.println("limit: " + floatBuffer.limit()); }} |
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:
// 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 FloatBuffer int capacity = 10; // Creating the FloatBuffer try { // creating object of FloatBuffer // and allocating size capacity FloatBuffer fb = FloatBuffer.allocate(capacity); // putting the value in floatbuffer fb.put(8.56F); fb.put(9.61F); fb.put(9.61F); fb.rewind(); // Creating a read-only copy of FloatBuffer // using asReadOnlyBuffer() method FloatBuffer fb1 = fb.asReadOnlyBuffer(); // print the ReadOnlyBuffer System.out.print("ReadOnlyBuffer FloatBuffer: "); while (fb1.hasRemaining()) System.out.print(fb1.get() + ", "); System.out.println(""); // print the Position of FloatBuffer fb System.out.println("\nPosition: " + fb.position()); // print the Limit of FloatBuffer fb System.out.println("\nlimit: " + fb.limit()); // Creating a compacted FloatBuffer of same ReadOnlyBuffer // using compact() method 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
