右擊有main方法的類

===> Run as

===> Run Configurations 

===>雙擊java application

===> 單擊有main方法的類

===>選中classpath選項卡

===> remove掉Bootstrap Entries下的android.jar

===> 然后點擊advanced

===> Add Library

===>JRE System Library

===>next

===>最后finish

===>Run