各位大哥帮我指正一下哪儿有错！

Question

import javax.swing.JOptionPane;
public class nsquare
    {
public static void main(String args[])
        {
        String s= JOptionPane.showInputDialog("输入一个整数");
        int n = Integer.parseInt(s);
        int nn=n*n;
        int nnn=nn*n;
        int nnnn=nn*nn;
        JOptionPane.showMessageDialog(
        null,
        s+"的平方"+nn+","+
                  s+"的立方"+nnn+","+
                  s+"的四次方"+nnnn,
        "标题：3的次方值",
        JOptionPane.PLAIN_MESSAGE);
        System.exit(0);
        }
    }
showMessageDialog()的参数个数不对

Answer 1

import javax.swing.JOptionPane;
public class nsquare
    {
public static void main(String args[])
        {
        String s= JOptionPane.showInputDialog("输入一个整数");
        int n = Integer.parseInt(s);
        int nn=n*n;
        int nnn=nn*n;
        int nnnn=nn*nn;
        String mmm =s+"的平方"+nn+","+s+"的立方"+nnn+","+s+"的四次方"+nnnn;
        JOptionPane.showMessageDialog(null,mmm,"标题：3的次方值", JOptionPane.PLAIN_MESSAGE);
        System.exit(0);
        }
    }