import java.applet.Applet;import java.awt.Button;import java.awt.Graphics;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JOptionPane;public class Task6_18 extends Applet { ? ?int size ;? ?public void init(){? ?Button bt = new Button("點擊我彈出輸入框");?? ?bt.addActionListener(new ActionListener(){? ?public void actionPerformed(ActionEvent e) {? ? String s = JOptionPane.showInputDialog(null, "請輸入:");? ? size = Integer.parseInt(s);? ? repaint();? ?}? });? this.add(bt);?} ?public void paint(Graphics g){? if(size>0){? ?squareOfAsterisks(g,size);? }?} ?public void squareOfAsterisks(Graphics g, int size){? String str="";? int x=50,y=100;? for(int j=0;j<size;j++)? ? str+="* ";? for(int i=0;i<size;i++){? ?g.drawString(str, x, y);? ?y+=10;? }?}}