Hi, All I am a java programmer. In my job, I found most of the bugs(except the logic mistakes in the design) are very common, for example: missing a parenthesis, cast an object into another uncompatible type, ... So I want to make a check list for java programmers, in which I lisk all the common mistakes, so when we coding we can try to avoid them, and when we have some compiling / running time error, we can also use this check list help us to find the bug. Followed is my check list, please give me any suggestions of yours. Java Programmer Check List 1. match the parenthesis 2. initialize the variables 3. use �equals� to compare two objects use �==� to compare two primitive variables 4. every line ended by ; 5. the instance variable have the scope as �private� 6. use constant to avoid the magic number 7. include all the required library 8. catch the exception 9. deep copy of an object (clone) 10. cast an object to another type 11. have a return command if the method have some return type. 12. flush and close a file after write data into it 13. use & and && correctly