String null to empty string (what does empty string mean)

Hello everyone , I meet you again , I'm your friend, Quan Jun .

In my previous project today , Made a mistake , It's because I didn't think well . In the project, I need , Get data from the background database , Then turn the data into Int type . But I ignored the case that the data is empty . for example ：

ad locum ,String The string is empty , use Integer.parseInt() Method conversion error . Modify it as follows

Today's own mistakes , As a result, the on-site personnel showed the system to the customer , Problems arise , Get data from the database later , Be sure to pay attention and pay attention again ！

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