执行#isClosed方法后是否需要关闭连接？

Question

I am wondering if testing the database connection will add up to the connection pool? to make it clear please see my code.

try {
    if (conn ==null || conn.isClosed()) {
        return false;
    }else {
        return true;
    }
} catch (Exception e){ 
    return false;
}

Do I need to add conn.close() after the return? even if it's just connection testing?

Answer 1

If this method is responsible in your design for making sure the connection is closed, then yes, you should close it just to make things clean; there's no sense in letting stale connections pile up. (And you shouldn't be catching Exception ; catch whatever specific exception is declared, which shouldn't be any here, so that real problem reports don't get eaten.)

Answer 2

Do I need to add conn.close() after the return?

You can't have any piece of code after a return statement. It'll be an unreachable code!

even if it's just connection testing?

If its just connection testing, better to close it, as you're not gonna use it further!