import?java.awt.*;
import?java.awt.event.*;

import?javax.swing.*;
import?javax.swing.border.*;

public?class?YSystem?extends?frame{
	Box?box1?box2?box3?box4;
	Label?label1?label2?label3?label4?label5;
	TextField?tf1tf2;
	JComboBox?combox;
	Button?button1button2button3;
	ScrollPane?spanel;
	TextArea?text;
	Panel?panel;
	
	String?op[]={“正常收費““打八折““打七折““打五折““滿300返100“};
	double?sum;
	
	YSystem（String?s）{
		super（）;
		settitle（s）;
		
		label1=new?Label（“單價：“）;
		label2=new?Label（“數(shù)量：“）;
		label3=new?Label（“收費方式：“）;
		box1=Box.createVerticalBox（）;
		box1.add（label1）;
		box1.add（label2）;
		box1.add（label3）;
		
		tf1=new?TextField（）;
		tf1.setForeground（Color.red）;
		tf2=new?TextField（）;
		tf2.setForeground（Color.red）;
		combox=new?JComboBox（op）;
		box2=Box.createVerticalBox（）;
		box2.add（tf1）;
		box2.add（tf2）;
		box2.add（combox）;
		
		button1=new?Button（“確定“）;
		button2=new?Button（“重置“）;
		button3=new?Button（“退出“）;
		box3=Box.createVerticalBox（）;
		box3.add（button1）;
		box3.add（button2）;
		box3.add（button3）;
		
		box4=Box.createHorizontalBox（）;
		box4.add（box1）;
		box4.add（box2）;
		box4.add（box3）;
		
		text=new?TextArea（615）;
		text.setEditable（false）;
		text.setFont（new?Font（“烏龍絞柱“Font.BOLD+Font.ITALIC22））;
		
		text.setBackground（Color.cyan）;
		spanel=new?ScrollPane（ScrollPane.SCROLLBARS_AS_NEEDED）;
		spanel.add（text）;
		
		label4=new?Label（“總計：“）;
		Font?f=new?Font（““Font.BOLD25）;
		label4.setFont（f）;
		label4.setForeground（Color.red）;
		
		label5=new?Label（“????????????????????????????????“）;
		label5.setFont（new?Font（“隸書“Font.BOLD18））;
		panel=new?Panel（）;
		panel.add（label4）;
		panel.add（label5）;
		
		add（BorderLayout.NORTHbox4）;
		add（BorderLayout.CENTERtext）;
		add（BorderLayout.SOUTHpanel）;
		
		button3.addActionListener（new?ActionListener（）{

			@Override
			public?void?actionPerformed（ActionEvent