import javax.swing.JOptionPane;
public class Pic1 {
public static void main(String args[])
{
JOptionPane.showInternalMessageDialog(null, "* * * * * * * * \n * * * * * * * *\n" +
"* * * * * * * * \n * * * * * * * *\n" +
"* * * * * * * * \n * * * * * * * *\n" +
"* * * * * * * * \n * * * * * * * *\n","result", JOptionPane.PLAIN_MESSAGE);
}


}
报了这样的错误：
Exception in thread "main" java.lang.RuntimeException: JOptionPane: parentComponent does not have a valid parent
at javax.swing.JOptionPane.createInternalFrame(Unknown Source)
at javax.swing.JOptionPane.showInternalOptionDialog(Unknown Source)
at javax.swing.JOptionPane.showInternalMessageDialog(Unknown Source)
at javax.swing.JOptionPane.showInternalMessageDialog(Unknown Source)
at Pic1.main(Pic1.java:6)
图形输不出来

不用那个包的，我不用JOpionPane的就能输出了，觉得好奇怪 ，也不知道是什么错误？

呵呵 ，谢谢千里斑竹的，就是那个问题