Java中的DoubleBuffer hasArray()方法
通过使用hasArray()类java.nio.DoubleBuffer中的方法，可以检查缓冲区是否具有可访问的double数组。如果缓冲区具有可访问的double数组的支持，则此方法返回true，否则返回false。
演示此的程序如下所示-
示例
import java.nio.*;
import java.util.*;
public class Demo {
public static void main(String[] args) {
int n = 5;
try {
DoubleBuffer buffer = DoubleBuffer.allocate(5);
buffer.put(4.5D);
buffer.put(1.2D);
buffer.put(3.9D);
buffer.put(7.5D);
buffer.put(5.8D);
buffer.rewind();
System.out.println("The DoubleBuffer is: " + Arrays.toString(buffer.array()));
boolean flag = buffer.hasArray();
if (flag)
System.out.println("The DoubleBuffer is backed by an array");
else
System.out.println("The DoubleBuffer is not backed by any array");
} catch (IllegalArgumentException e) {
System.out.println("Error!!! IllegalArgumentException");
} catch (ReadOnlyBufferException e) {
System.out.println("Error!!! ReadOnlyBufferException");
}
}
}上面程序的输出如下-
输出结果
The DoubleBuffer is: [4.5, 1.2, 3.9, 7.5, 5.8] The DoubleBuffer is backed by an array