Demo :: clean code -> handling exception

bad.java

String status = "";
status = connect();
if(status != null && "success".equals(status)) {
  status = prepare();
  if(status != null && "success".equals(status)) {
    
    List<User> users = execute();
    if(users != null && users.size() > 0) {
      ....
    }
    
  }
  
}

better.java

try {
  connect();
  prepare();
  List<User> users = execute();
  ...
  
  
} catch( Exception e) {
  //handle when exceptions are occured
}