El método compact() de java.nio.DoubleBuffer Class se usa para compactar el búfer dado.
Los valores entre la posición actual del búfer y su límite se copian al principio del búfer. Luego, la posición del búfer se establece en n+1 y su límite se establece en su capacidad. La posición del búfer se establece en el número de flotantes copiados.
Sintaxis:
public abstract DoubleBuffer compact()
Valor devuelto: este método devuelve el nuevo DoubleBuffer con el mismo contenido que el de este búfer.
Excepción: este método lanza ReadOnlyBufferException , si este búfer es de solo lectura.
El siguiente programa ilustra el método compact():
Ejemplos 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 DoubleBuffer
int capacity = 10;
// Creating the DoubleBuffer
// creating object of Doublebuffer
// and allocating size capacity
DoubleBuffer db = DoubleBuffer.allocate(capacity);
// putting the value in Doublebuffer
db.put(8.56F);
db.put(9.61F);
db.put(9.61F);
// print the DoubleBuffer
System.out.println("Original DoubleBuffer: "
+ Arrays.toString(db.array()));
System.out.println("Position: " + db.position());
System.out.println("limit: " + db.limit());
// Creating a compacted DoubleBuffer of same DoubleBuffer
// using compact() method
DoubleBuffer DoubleBuffer = db.compact();
// print the DoubleBuffer
System.out.println("\nCompacted DoubleBuffer: "
+ Arrays.toString(DoubleBuffer.array()));
System.out.println("Position: " + DoubleBuffer.position());
System.out.println("limit: " + DoubleBuffer.limit());
// putting the value in compacted Doublebuffer
DoubleBuffer.put(9.61F);
// print the DoubleBuffer
System.out.println("\nUpdated Compacted DoubleBuffer: "
+ Arrays.toString(DoubleBuffer.array()));
System.out.println("Position: " + DoubleBuffer.position());
System.out.println("limit: " + DoubleBuffer.limit());
}
}
Producción:
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
Ejemplos 2: Para mostrar ReadOnlyBufferException
// 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 DoubleBuffer
int capacity = 10;
// Creating the DoubleBuffer
try {
// creating object of DoubleBuffer
// and allocating size capacity
DoubleBuffer db = DoubleBuffer.allocate(capacity);
// putting the value in Doublebuffer
db.put(8.56F);
db.put(9.61F);
db.put(9.61F);
db.rewind();
// Creating a read-only copy of DoubleBuffer
// using asReadOnlyBuffer() method
DoubleBuffer db1 = db.asReadOnlyBuffer();
// print the ReadOnlyBuffer
System.out.print("ReadOnlyBuffer DoubleBuffer: ");
while (db1.hasRemaining())
System.out.print(db1.get() + ", ");
System.out.println("");
// print the Position of DoubleBuffer db
System.out.println("\nPosition: " + db.position());
// print the Limit of DoubleBuffer db
System.out.println("\nlimit: " + db.limit());
// Creating a compacted DoubleBuffer of same ReadOnlyBuffer
// using compact() method
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);
}
}
}
Producción:
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
Publicación traducida automáticamente
Artículo escrito por pawan_asipu y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA