java 中的 pack（）

java 中的 pack（） package net.mindview.util;import java.awt.*;import java.awt.event.*;public class Eog extends Frame{private Panel panel;private Label label;private String[] names={"7","8","9","+","4","5","6","-","1","2","3","*","0",".","=","/"};private Button[] buttons=new Button[16];public Eog(String title){super(title);label=new Label();panel=new Panel();panel.setLayout(new GridLayout(4,4));add(label,"North");add(panel,"Center");for(int i=0;i