package cn.edu.shengda;
 
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.Border;
 
public class JiSuanqi {
	public static void main(String[] args) {
		new myFrame("TWY计算器");
	}
 
}
 
class myFrame extends JFrame  {
 
	JTextField text = new JTextField();
	
	JButton[] bt = new JButton[20];
	String key[] = new String[] { "ans", "del", "EC", "C", "1", "2", "3", "+", "4", "5", "6", "-", "7", "8", "9", "*",
			"0", ".", "=", "/" };
	JPanel keyPanel = new JPanel();
 
	boolean finish = false;
	double ans=0;
 
	public myFrame(String title) {
		super(title);
		init();
	}
 
	public void init() {
		text.setHorizontalAlignment(JTextField.RIGHT);
		text.setPreferredSize(new Dimension(0, 40));
		text.setFont(new Font("宋体", Font.BOLD, 20));
		
		for (int i = 0; i < bt.length; i++) {
			bt[i] = new JButton(key[i]);
		}
		Container pane = this.getContentPane();
		this.add(text, BorderLayout.NORTH);
		keyPanel.setLayout(new GridLayout(5, 4, 3, 3));
		this.add(keyPanel, BorderLayout.CENTER);
		for (int i = 0; i < bt.length; i++) {
			keyPanel.add(bt[i]);
			bt[i].addActionListener(new ActionListener() {
 
                                @Override
				public void actionPerformed(ActionEvent e) {
 
					if (finish == true) {
						text.setText("");
						finish = false;
					}
					String command = e.getActionCommand();
					String s = text.getText();
					if ("0123456789.+-*/".indexOf(command) >= 0)
						text.setText(text.getText() + command);
					else if (command.equals("del"))
						text.setText(s.substring(0, s.length() - 1));
					else if (command.equals("C") || command.equals("EC"))
						text.setText("");
					else if (command.equals("ans") )
						text.setText(text.getText() + ans);
					else if (command.equals("=")) {
						ans=new calc(s).result;
						text.setText(text.getText() + "="+ans);
						finish = true;
					}
 
				}
			});
		}
		this.setVisible(true);
		this.setLocation(500, 200);
		this.setSize(325, 325);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
	}
}