Solve a quadratic equation in java using the dialog box. This is my code but there are a couple of errors, can you tell me what I am doing wrong.

import javax.swing.JOptionPane; public class { public static void main(String[] args) { double a = Integer.parseInt(JOptionPane.showInputDialog("Please enter value for a ")); double b = Integer.parseInt(JOptionPane.showInputDialog("Please enter value for b ")); double c = Integer.parseInt(JOptionPane.showInputDialog("Please enter value for c ")); double D; double x1; double x2; double x; String ans1, ans2, ans3, ans4, ans5, ans6, ans7, ans8, ans9; ans1 = ("All Solutions"); ans2 = ("No Solutions"); ans3 = ("One Solution"); ans4 = ("x = "+x); ans5 = ("No Solution"); ans6 = ("duplicate Solution"); ans7 = ("x = "+x); ans8 = ("x1 = "+x1); ans9 = ("x2 = "+x2); if (a==0) if (b==0) if (c==0) JOptionPane.showMessageDialog(null, ans1); else JOptionPane.showMessageDialog(null, ans2); else { JOptionPane.showMessageDialog(null, ans3); x = -c/b; JOptionPane.showMessageDialog(null, ans4); } else { D = b*b - 4*a*c; if (D<0) JOptionPane.showMessageDialog(null, ans5); else if (D==0){ JOptionPane.showMessageDialog(null, ans6); x = -b/2*a; JOptionPane.showMessageDialog(null, ans7); } else { x1 = (-b + Math.sqrt(D))/2*a; x2 = (-b - Math.sqrt(D))/2*a; JOptionPane.showMessageDialog(null, ans8); JOptionPane.showMessageDialog(null, ans9); } } } }