下面列出了怎么用org.apache.hadoop.fs.CanSetReadahead的API类实例代码及写法，或者点击链接到github查看源代码。
@Override
public void setReadahead(Long readahead) throws IOException,
UnsupportedOperationException {
try {
((CanSetReadahead) in).setReadahead(readahead);
} catch (ClassCastException e) {
throw new UnsupportedOperationException("This stream does not support " +
"setting the readahead caching strategy.");
}
}
@Override
public void setReadahead(Long readahead) throws IOException,
UnsupportedOperationException {
try {
((CanSetReadahead) in).setReadahead(readahead);
} catch (ClassCastException e) {
throw new UnsupportedOperationException("This stream does not support " +
"setting the readahead caching strategy.");
}
}