Troll height estimated

Height.java

import java.util.*;
import javax.swing.*;
class Height {
	public static void main(String[] args) {
		JFrame myFrame = new JFrame();
		myFrame.setSize(500, 300);
		myFrame.setTitle("Ung dung do chieu cao cua ban ");
		myFrame.setVisible(true);
		myFrame.getIconImage();
		String str = JOptionPane.showInputDialog(myFrame, "Nhap vao chieu cao cua ban (cm) : ");
		int a = Integer.parseInt(str);
		JOptionPane.showMessageDialog(myFrame, "Chieu cao cua ban la : " + a + "cm");
		JOptionPane.showMessageDialog(myFrame, "Va chung toi goi day la : CHAT TOI TUNG XENTIMET");
		
		
		
	}
}