按老师操作来的,结果报错: Exception in thread "main" java.lang.Error: Unresolved compilation problem: Sys cannot be resolved at com.imook.Telphone.sendMessage(Telphone.java:13) at com.imook.InitialTelphone.main(InitialTelphone.java:8) 什么原因?
求采纳,谢谢。
知道了,自己粗心写错了一个方法名称