Java中的DoubleBuffer asReadOnlyBuffer()方法
可以使用asReadOnlyBuffer()java.nio.DoubleBuffer类中的方法使用缓冲区的内容来创建只读双缓冲区。新缓冲区不能做任何修改，因为它是只读缓冲区。但是，新缓冲区的容量，位置，限制等与先前的缓冲区相同。
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 Original DoubleBuffer is: " + Arrays.toString(buffer.array()));
DoubleBuffer roBuffer = buffer.asReadOnlyBuffer();
System.out.println("The ReadOnlyBuffer DoubleBuffer is: ");
while (roBuffer.hasRemaining())
System.out.print(roBuffer.get() + " ");
} 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 Original DoubleBuffer is: [4.5, 1.2, 3.9, 7.5, 5.8] The ReadOnlyBuffer DoubleBuffer is: 4.5 1.2 3.9 7.5 5.8