Java中的CharBuffer asReadOnlyBuffer()方法
可以使用asReadOnlyBuffer()java.nio.CharBuffer类中的方法使用缓冲区的内容来创建只读char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 {
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 Original CharBuffer is: " + Arrays.toString(buffer.array()));
CharBuffer roBuffer = buffer.asReadOnlyBuffer();
System.out.println("The ReadOnlyBuffer CharBuffer 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");
}
}
}输出结果
The Original CharBuffer is: [A, P, P, L, E] The ReadOnlyBuffer CharBuffer is: A P P L E