当运行此代码时，我得到一个异常如何解决此问题

Question

我遇到此错误：

    public FORM_ENTRY()
    {
        InitializeComponent();
        LabelWelcome.Text = "Welcome! Welkom! Selamat Datang! Wilkommen!";
        timer1.Enabled = true;
        LabelCheckedIn.Visible = false;
        LabelEnjoy.Visible = false;
    }

    private void StartScroll()
    {
        System.Text.StringBuilder sb = new System.Text.StringBuilder(LabelWelcome.Text + " ");

        while (true)
        {
            char ch = sb[sb.Length - 1];
            sb.Remove(sb.Length - 1, 1);
            sb.Insert(0, ch);
            LabelWelcome.Text = sb.ToString();
            LabelWelcome.Refresh();
            System.Threading.Thread.Sleep(500);
        }
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        StartScroll();
    }

    private void ButtonExit_Click(object sender, EventArgs e)
    {
        this.Close();
    }

Exception in thread "main" java.lang.NoSuchMethodError: Calc.<init>(II)V
    at ex10thekeywords.main(ex10thekeywords.java:19)

class Calc
{
    int num1, num2, result;

    public Calc(int number1, int number2) 
    {
        num1 = number1;
        num2 = number2;
    }

}

Answer 1

创建Calc.java并将calc类移到其中，但请确保将calc类公开。