動作監聽器不起作用

Question

嘗試調用方法getuserinput時出現錯誤。 這是我破碎的代碼。

initialvelocitybutton.addActionListener(new ActionListener() { 
            public void actionPerformed(ActionEvent e) {
        getuserinput(); //I am getting an error saying "The method getuserinput() is undefined for the type new ActionListener(){}"
           }
        });

static void getuserinput(){   //method to get users input
                double initialvelocity = Double.parseDouble(
                           JOptionPane.showInputDialog("please enter initial velocity")); //gets initial value of intiial velcoity
                double angleoflaunch = Double.parseDouble(
                           JOptionPane.showInputDialog("please enter angle of launch"));
}

Answer 1

getuserInput()被聲明為static 。 您必須使用類名稱引用它： NameOfYourClass.getuserInput();