Android Device Monitor is being replaced by features built into Android Studio directly.
If you’re looking for performance related tools, check out the Android Profiler tab: https://developer.android.com/studio/profile/android-profiler.html
There’s a Device File Explorer tab too.
We will be updating the next version of the book to remove Android Device Monitor completely. So, I’m not sure how to fix the problem you’re seeing, but I would recommend not using Android Device Monitor if you don’t have to.
thanks ,when i ues jdk 1.8 my question has been solved