Java中的CharBuffer hasArray()方法
通过使用hasArray()类java.nio.CharBuffer中的方法，可以检查缓冲区是否具有可访问char数组的支持。如果缓冲区具有可访问的int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 {
CharBuffer buffer = CharBuffer.allocate(5);
buffer.put('A');
buffer.put('P');
buffer.put('P');
buffer.put('L');
buffer.put('E');
buffer.rewind();
System.out.println("The CharBuffer is: " + Arrays.toString(buffer.array()));
boolean flag = buffer.hasArray();
if (flag)
System.out.println("The CharBuffer is backed by an array");
else
System.out.println("The CharBuffer is not backed by any array");
} catch (IllegalArgumentException e) {
System.out.println("Error!!! IllegalArgumentException");
} catch (ReadOnlyBufferException e) {
System.out.println("Error!!! ReadOnlyBufferException");
}
}
}输出结果
The CharBuffer is: [A, P, P, L, E] The CharBuffer is backed by an array