//tab
// ctrl + / single-line comment
// ctrl + shift + / multi-line comments
// ctrl + d Copy the current cursor line
// ctrl + x to delete the current cursor line
// CTRL + B to quickly open structure or method of the cursor position (jump to the definition)
// CTRL + "+/-" for the current method may be expanded or collapsed
// ctrl + shift + l code formatting
// ctrl + shift + o Optimization imported package
// Shift + Enter a new row may be inserted down, even if the cursor is in the middle of the current row
// Alt + Shift + up / down code can be moved up and down cursor line
// Ctrl + Shift + U will convert the selected content case
// Alt + Insert generating test code
// Alt + Up / Down to move quickly to the next or a method
// CTRL + ALT + T can be wrapped in a block of code, for example, if {...} else {...}
// CTRL + Backspace to delete word by word