android工程下不能运行java main程序的解决方法

右击有main方法的类

===> run as

===> run configurations 

===>双击java application

===> 单击有main方法的类

===>选中classpath选项卡

===> remove掉bootstrap entries下的android.jar

===> 然后点击advanced

===> add library

===>jre system library

===>next

===>最后finish

===>run