在jdk安裝的根目錄下自帶的有源碼 jdk-11.0.5\lib\src.zipjava
點擊idea菜單File --> Project Structure --> SDKs ,修改JDK home path爲jdk的安裝目錄ide
點擊idea菜單File --> Setting --> Build,Execution,Deployment --> Debugger --> Stepping
把Do not step into the classes中的ajva.*,javax.*取消勾選ui