Java 中的 DoubleBuffer 数组()方法示例
原文:https://www . geesforgeks . org/double buffer-array-in-Java-method-with-examples/
java.nio.DoubleBuffer 类的数组()方法用于返回支持该缓冲区的双数组。对此缓冲区内容的修改将导致返回数组的内容被修改，反之亦然。Invoke()在调用此方法之前使用 hasArray()方法，以确保此缓冲区具有可访问的后备数组
语法:
public final float[] array()
返回值:这个方法返回支持这个缓冲区的数组。
异常:如果此缓冲区由数组支持但为只读，则此方法将引发readonlybufferrexception。
下面的程序说明了 array()方法:
实施例 1:
// Java program to demonstrate
// array() 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(2, 9.61F);
db.rewind();
// getting array from db DoubleBuffer using array() method
double[] dbb = db.array();
// printing the DoubleBuffer db
System.out.println("DoubleBuffer: "
+ Arrays.toString(dbb));
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output:
DoubleBuffer: [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
例 2:
// Java program to demonstrate
// array() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the db
int capacity1 = 10;
// Declaring the capacity of the db1
int capacity2 = 5;
// Creating the DoubleBuffer
try {
//
// db
//
// creating object of Doublebuffer db
// and allocating size capacity
DoubleBuffer db = DoubleBuffer.allocate(capacity1);
// putting the value in db
db.put(9.56F);
db.put(2, 7.61F);
db.put(3, 4.61F);
db.rewind();
// print the DoubleBuffer
System.out.println("DoubleBuffer db: "
+ Arrays.toString(db.array()));
//
// db1
//
// creating object of Doublebuffer db1
// and allocating size capacity
DoubleBuffer db1 = DoubleBuffer.allocate(capacity2);
// putting the value in db1
db1.put(1, 4.56F);
db1.put(2, 6.45F);
db1.rewind();
// print the DoubleBuffer
System.out.println("\nDoubleBuffer db1: "
+ Arrays.toString(db1.array()));
// Creating a read-only copy of DoubleBuffer
// using asReadOnlyBuffer() method
DoubleBuffer readOnlyDb = db.asReadOnlyBuffer();
// print the DoubleBuffer
System.out.print("\nReadOnlyBuffer DoubleBuffer: ");
while (readOnlyDb.hasRemaining())
System.out.print(readOnlyDb.get() + ", ");
// try to change readOnlyDb
System.out.println("\n\nTrying to get the array"
+ " from ReadOnlyDb for editing");
Arrays.toString(readOnlyDb.array());
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception thrown: " + e);
}
}
}
Output:
DoubleBuffer db: [9.5600004196167, 0.0, 7.610000133514404, 4.610000133514404, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
DoubleBuffer db1: [0.0, 4.559999942779541, 6.449999809265137, 0.0, 0.0]
ReadOnlyBuffer DoubleBuffer: 9.5600004196167, 0.0, 7.610000133514404, 4.610000133514404, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
Trying to get the array from ReadOnlyDb for editing
Exception thrown: java.nio.ReadOnlyBufferException
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