https://www.eecis.udel.edu/~xiwang/java.html http://www.java2s.com/ http://www.programcreek.com/java-api-examples/index.php 非常多实用的例子，直接搜类名可以找到很多demo，比如：ScheduledExecutorService
Problem ＃1 my project from within IntelliJ IDEA , I got this error: Can't update: no tracked branch No tracked branch configured for branch master. To make your branch track a remote branch call, for example, git branch --set-upstream master origin/master It does provide this suggestion but I am not sure what to do at this point. Is there a way to fix this from within Android Studio? Solutions$cd $GIT_DIR$ $git branch --set-upstream-to remotes/origin/master master Like the old Albert Einstein said: If you can't explain it......