我有一个字节数组，它必须转换为 MappedByteBuffer。
但是当我尝试创建 MappedByteBuffer 时，会发生错误。
error: cannot find symbol method MappedByteBuffer(int,int,int,int,byte[],int)
MappedByteBuffer.java
package java.nio;
import java.io.FileDescriptor;
import sun.misc.Unsafe;
public abstract class MappedByteBuffer
extends ByteBuffer
{
...
// Android-added: Additional constructor for use by Android's DirectByteBuffer.
MappedByteBuffer(int mark, int pos, int lim, int cap, byte[] buf, int offset) {
super(mark, pos, lim, cap, buf, offset); // <- when I hover mouse here, ByteBuffer() in ByteBuffer cannot be applied to message appears with a red underline.
this.fd = null;
}
...
}
字节缓冲区.java
package java.nio;
import libcore.io.Memory;
import dalvik.annotation.codegen.CovariantReturnType;
public abstract class ByteBuffer
extends Buffer
implements Comparable<ByteBuffer>
{
// These fields are declared here rather than in Heap-X-Buffer in order to
// reduce the number of virtual method invocations needed to access these
// values, which is especially costly when coding small buffers.
//
final byte[] hb; // Non-null only for heap buffers
final int offset;
boolean isReadOnly; // Valid only for heap buffers
// Creates a new buffer with the given mark, position, limit, capacity,
// backing array, and array offset
//
ByteBuffer(int mark, int pos, int lim, int cap, // package-private
byte[] hb, int offset)
{
// Android-added: elementSizeShift parameter (log2 of element size).
super(mark, pos, lim, cap, 0 /* elementSizeShift */);
this.hb = hb;
this.offset = offset;
}
...
}
我觉得奇怪的是当extends ByteBuffer在 MappedByteBuffer.java 中定义 goto 时，它显示的是 ByteBuffer.annotated.java，而不是 ByteBuffer.java
ByteBuffer.annotated.java
// -- This file was mechanically generated: Do not edit! -- //
package java.nio;
@SuppressWarnings({"unchecked", "deprecation", "all"})
public abstract class ByteBuffer extends java.nio.Buffer implements java.lang.Comparable<java.nio.ByteBuffer> {
ByteBuffer(int mark, int pos, int lim, int cap) { super(0, 0, 0, 0, 0); throw new RuntimeException("Stub!"); }
我不知道 {classname}.annotated.java 做了什么，所以它可能不是错误，但我粘贴了，因为我认为它很奇怪。
那么如何从字节数组创建 MappedByteBuffer 呢？只有 1 个构造函数，但它已损坏。