non-final to final 

no 

yes 

final to non-final 

yes 

yes 

non-abstract to abstract 

no 

yes 

abstract to non-abstract 

yes 

yes 

more restrictive access 

no 

no 

less restrictive access 

no  

yes 

add a new non-private block 

no  

yes 

add a new private block 

yes 

yes 

remove/rename a non-private block 

no 

no 

remove/rename a private block 

yes 

yes 

change body of block 

yes  

yes 

add/modify/remove local vars of block 

yes  

yes 

add/modify/remove params of private block 

yes 

yes 

add required param to non-private block 

no 

no 

add optional param 

yes 

yes 

remove optional/required param 

yes  

yes  

rename optional param 

yes  

yes  

rename required param of non-private block 

no 

no 

change param from optional to required in non-private block 

no 

no 

change param from required to optional 

yes 

yes 

change param displayMode 

yes  

yes 

change param prompt 

yes 

yes