public static boolean isAbstract(int flags) {
    return (flags & ACC_ABSTRACT) != 0;
  }
Returns whether the flag {@code ACC_ABSTRACT} is on in the given flags.

@param flags the flags to check
@return the value of the {@code ACC_ABSTRACT} flag
android/android_framework/dex-maker/src/main/java/com/android/dx/rop/code/AccessFlags.java