import?java.awt.*;
import?java.awt.event.*;
import?java.awt.event.WindowEvent;
import?javax.swing.*;

public?class?Find_root2?extends?frame?implements?ActionListener{
	????int?size=20;
			Label?labeltitle2lb1lb2lb3lb4lbxxlabelBottomlabelBottom2labelBottom_labelBottom__;
			JLabel?labeltitle1;
			TextField?in1in2in3;
			Button?btn;
			double?d1d2d3;
			
			
			public?Find_root2（String?title）{
					super（title）;
					labelBottom2=new?Label（）;labelBottom_=new?Label（）;labelBottom__=new?Label（）;
					labeltitle1=new?JLabel（“一元二次方程求根器“）;
					labeltitle1.setFont（new?Font（“Serif“Font.PLAINsize））;
					labeltitle1.setHorizontalAlignment（SwingConstants.CENTER）;
					labeltitle2=new?Label（“請在下面空白處分別填入相應x系數：“）;
					lb1=new?Label（““）;
					lb2=new?Label（“X^2+“）;