package?cn.asam.calculator;

import?java.awt.EventQueue;

import?javax.swing.Jframe;
import?javax.swing.JTextField;
import?javax.swing.SpringLayout;
import?javax.swing.JSeparator;
import?java.awt.Color;
import?javax.swing.JButton;
import?java.awt.Font;
import?javax.swing.SwingConstants;
import?java.awt.event.MouseAdapter;
import?java.awt.event.MouseEvent;
import?java.math.BigDecimal;
import?java.util.Stack;

public?class?Calculator?{

	private?Jframe?frmCalculator;
	private?JTextField?inputTxt;
	private?JTextField?result;
	private?JSeparator?separator;
	private?JButton?eight;
	private?JButton?nine;
	private?JButton?multiply;
	private?JButton?four;
	private?JButton?five;
	private?JButton?six;
	private?JButton?subtract;
	private?JButton?one;
	private?JButton?two;
	private?JButton?three;
	private?JButton?add;
	private?JButton?dot;
	private?JButton?zero;
	private?JButton?divide;
	private?JButton?btnEqual;
	private?JButton?btnDel;

	/**
	?*?Launch?the?application.
	?*/
	public?static?void?main（String[]?args）?{
		EventQueue.invokeLater（new?Runnable（）?{
			public?void?run（）?{
				try?{
					Calculator?window?=?new?Calculator（）;
					window.frmCalculator.setVisible（true）;
				}?catch?（Exception?e）?{
					e.printStackTrace（）;
				}
			}
		}）;
	}

	/**
	?*?Create?the?application.
	?*/
	public?Calculator（）?{
		initialize（）;
	}

	/**
	?*?獲取傳入參數按鈕的文本
	?*?
	?*?@param?btn
	?*?@return
	?*/
	private?String?getBtnText（JButton?btn）?{
		String?text?=?null;
		text?=?btn.getText（）;
		return?text;
	}

	/**
	?*?將按鈕上的文本顯示到輸入運算式框中
	?*?
	?*?@param?str
	?*?@param?inputTxt
	?*/
	private?void?txtToInputTxt（String?str?JTextField?inputTxt）?{
		String?currentTxt?=?inputTxt.getText（）;
		if?（str.matches（“^[\\+\\-\\*\\/]$“）?&&?currentTxt.matches（“^.+[\\+\\-\\*\\/]$“））?{
			//?如果輸入框中的最后一位是（+-*/）中的一位的，就將最后一位去掉，寫上最新的符號
			int?strLength?=?currentTxt.length（）;
			String?rStr?=?currentTxt.substring（0?strLength?-?1）;
			inputTxt.setText（rStr?+?str）;
		}?else?{
			inputTxt.setText（currentTxt?+?str）;
		}
	}

	/**
	?*?將傳入的一般運算表達式計算出結果
	?*?
	?*?@param?inputTxt
	?*/
	private?void?setResult（String?inputTxt）?{
		String?suffixExpre?=?toSuffix（inputTxt）;
		BigDecimal?rSum?=?getSuffixResult（suffixExpre）;
		result.setText（rSum.doubleValue（）?+?““）;
	}

	/**
	?*?Initialize?the?contents?of?the?frame.
	?*/
	private?void?initialize（）?{
		frmCalculator?=?new?Jframe（）;
		frmCalculator.setResizable（false）;
		frmCalculator.settitle（“Calculator“）;
		frmCalculator.getContentPane（）.setBackground（Color.DARK_GRAY）;
		frmCalculator.setBounds（800?200?386?454）;
		frmCalculator.setDefaultCloseOperation（Jframe.EXIT_ON_CLOSE）;

		inputTxt?=?new?JTextField（）;
		inputTxt.setEditable（false）;
		inputTxt.setBackground（Color.WHITE）;
		inputTxt.setBorder（null）;
		inputTxt.setFont（new?Font（“黑體“?Font.BOLD?32））;
		inputTxt.setHorizontalAlignment（SwingConstants.RIGHT）;
		inputTxt.setText（““）;
		inputTxt