Low-level errors in Java

1, you can not use "= =" to compare the contents of two strings equal.

2. When a foreach loop is made to a list, the structure of the list cannot be modified in the loop code.

3, the log and the actual situation is inconsistent; The exception stack is not logged in the log after catching the exception.

4, the Devil number.

5, NULL pointer exception.

6, array subscript out of bounds.

7. NumberFormatException exception is not caught when converting a string to a number.

8, the file, IO, database and other resources to operate without timely and correct release.

9, loop body encoding without regard to performance, the loop body contains unnecessary repetitive logic.

10. The data class does not overload the ToString () method.

Low-level errors in Java