double d=Double.valueof(str).doubleVable();//?==>can not resolve (valueOf)btnNew.addActionListerner(lSymAction);//?==>can not resolve symbol method (addActionListener)btnNew.setBackgroud(java.awt.Color.lightGray);//?==>can not resolve symbol method
(setBackground)public void actongPerformed(java.awt.event.ActionEvent event) (actionPerformed)这四个地方是输入错误。属于粗心。
(setBackground)public void actongPerformed(java.awt.event.ActionEvent event) (actionPerformed)这四个地方是输入错误。属于粗心。
说:
double d=Double.valueof(str).doubleVable();//?==>can not resolve (valueOf)btnNew.addActionListerner(lSymAction);//?==>can not resolve symbol method (addActionListener)btnNew.setBackgroud(java.awt.Color.lightGray);//?==>can not resolve symbol method
(setBackground)public void actongPerformed(java.awt.event.ActionEvent event) (actionPerformed)这四个地方是输入错误。属于粗心。
其实第一点还有个错误:
double d=Double.valueof(str).doubleVable();//?==>can not resolve (valueOf)和(doubleValue());
谢谢各位,应该说吃一堑,长一智啊