Problem phenomenon ：

        As the title , How to be in IDEA Of settings Properties of the , By setting shortcut keys, English letters in strings can be converted to upper and lower case ？

Problem analysis ：

        Just briefly , Why is there such an idea ！

         Have used pg(postgresql) and Oracle Database people will know , The former uses the lowercase rule , The latter is the capitalization rule , So I'm writing code , There will be operations that require case conversion ！！！

        besides , Usually we are in the development process , There will also be operations that require immediate case conversion of some strings .

        IDEA Very powerful , Because this tool comes with a shortcut key for case conversion ！

        However , What's disappointing is , If you go online to search for information , Basically, all the articles you can search will tell you that the shortcut key is ctrl+shift+u, Then you may press it and find it useless , At least I am ！ This is also where I am disappointed , because I don't need you to tell me directly what the key pressing rules are , What I want is how to configure ！ As the saying goes ： Teaching a man to fish is better than giving him a fish ！

        This is because not all IDEA All users use the default shortcut configuration , For example, I set myself to eclipse  style ; Although it is not a hard requirement , But I personally strongly recommend that you use , Very practical , It conforms to the shortcut keys commonly used by developers ; Because many shortcut keys are the same in other software tools .

         So don't say much , Directly above ！

resolvent ：

hold Shortcut key rules configure eclipse style  ：

        open IDEA Of Settings window （File-Settings）, stay Keymap In the tab , In the drop-down list , find Eclipse And click on... In the lower right corner OK that will do . I chose Eclipse copy, This is because I am choosing Eclipse after , There have been some of them Shortcut key rules It's been done Custom modification , Because everyone always has their own habit of pressing buttons .

Set the case conversion shortcut ：

        open File-Settings-Keymap tab , It's in the top right corner Search box in , Input toggle, Find the summary shown in the red box below Toggle Case attribute , There are two , For consistency , It's best to change both to the same shortcut rule ：

         Double clicking will pop up the operation tab , You can see that there are already three shortcut key rules here , But for some unknown reasons （ For example, shortcut key conflicts and so on ） It doesn't take effect after I press , So here I suggest remove The following three shortcut key rules , And then again Add Keyboard Shrotcut Customize new shortcut rules , And ensure that it will not conflict with other shortcut key rules ：

         Here I change it to Alt+U 

         After modification, you will find that the following shortcut key rules are automatically consistent with those just modified , And then click Apply - OK ：  

  Examples of use ：

          stay IDEA In the tools , The string you want to convert in any box ：

Press the keyboard alt + u , You can see that for the first time, it turns into all lowercase ：

Press again  alt + u , See the second turn into all capital ：