package com.rgy.entity;

import java.awt.*;

import java.awt.event.*;

@SuppressWarnings("serial")

public class Computer extends Frame implements ActionListener{

	private Panel panel_keys;

	private TextField text_show;

	private String str="";

	private double num_record=0;

	private int count_cut=0;

	private int count_multiplication=0;

	private int count_division=0;

	private int op=0;

	private Button button_num0;private Button button_num1;

	private Button button_num2;private Button button_num3;

	private Button button_num4;private Button button_num5;

	private Button button_num6;private Button button_num7;

	private Button button_num8;private Button button_num9;

	private Button button_division;

	private Button button_multiplication;

	private Button button_cut;

	private Button button_add;

	private Button button_equal;

	private Button button_point;

	public Computer(){

		super("计算器");

		this.setVisible(true);

		this.setBounds(500,250,300,250);

		panel_keys=new Panel();

		text_show=new TextField();

		text_show.setEditable(false);

		button_num0=new Button("0");button_num1=new Button("1");

		button_num2=new Button("2");button_num3=new Button("3");

		button_num4=new Button("4");button_num5=new Button("5");

		button_num6=new Button("6");button_num7=new Button("7");

		button_num8=new Button("8");button_num9=new Button("9");

		button_division=new Button("/");

		button_multiplication=new Button("*");

		button_cut=new Button("-");

		button_add=new Button("+");

		button_equal=new Button("=");

		button_point=new Button(".");

		this.add(text_show,BorderLayout.NORTH);

		this.add(panel_keys,BorderLayout.CENTER);

		panel_keys.add(button_num7);panel_keys.add(button_num8);panel_keys.add(button_num9);panel_keys.add(button_division);

		panel_keys.add(button_num4);panel_keys.add(button_num5);panel_keys.add(button_num6);panel_keys.add(button_multiplication);

		panel_keys.add(button_num1);panel_keys.add(button_num2);panel_keys.add(button_num3);panel_keys.add(button_cut);

		panel_keys.add(button_num0);panel_keys.add(button_point);panel_keys.add(button_equal);panel_keys.add(button_add);

		panel_keys.setLayout(new GridLayout(4,4));

		this.addWindowListener(new WinClose());

		button_num0.addActionListener(this);

		button_num1.addActionListener(this);

		button_num2.addActionListener(this);

		button_num3.addActionListener(this);

		button_num4.addActionListener(this);

		button_num5.addActionListener(this);

		button_num6.addActionListener(this);

		button_num7.addActionListener(this);

		button_num8.addActionListener(this);

		button_num9.addActionListener(this);

		button_division.addActionListener(this);

		button_multiplication.addActionListener(this);

		button_add.addActionListener(this);

		button_cut.addActionListener(this);

		button_equal.addActionListener(this);

		button_point.addActionListener(this);

	}

	//键盘事件监听

	public void actionPerformed(ActionEvent ev) {

		if(ev.getSource()==button_num0){

			str=text_show.getText()+"0";

			text_show.setText(str);

		}

		if(ev.getSource()==button_num1){

			str=text_show.getText()+"1";

			text_show.setText(str);

		}

		if(ev.getSource()==button_num2){

			str=text_show.getText()+"2";

			text_show.setText(str);

		}

		if(ev.getSource()==button_num3){

			str=text_show.getText()+"3";

			text_show.setText(str);

		}

		if(ev.getSource()==button_num4){

			str=text_show.getText()+"4";

			text_show.setText(str);

		}

		if(ev.getSource()==button_num5){

			str=text_show.getText()+"5";

			text_show.setText(str);

		}

		if(ev.getSource()==button_num6){

			str=text_show.getText()+"6";

			text_show.setText(str);

		}

		if(ev.getSource()==button_num7){

			str=text_show.getText()+"7";

			text_show.setText(str);

		}

		if(ev.getSource()==button_num8){

			str=text_show.getText()+"8";

			text_show.setText(str);

		}

		if(ev.getSource()==button_num9){

			str=text_show.getText()+"9";

			text_show.setText(str);

		}

		if(ev.getSource()==button_point){

			str=text_show.getText()+".";

			text_show.setText(str);

		}

		if(ev.getSource()==button_add){

			if(op==5){}

			else{

				num_record=num_record+Double.parseDouble(str);

			}

			str="";

			text_show.setText(str);

			op=1;

		}

		if(ev.getSource()==button_cut){

			if(op==5){}

			else{

				if(count_cut==0){

					num_record=Double.parseDouble(str);

					count_cut++;

				}

				else{

					num_record=num_record-Double.parseDouble(str);

				}

			}

			str="";

			text_show.setText(str);

			op=2;

		}

		if(ev.getSource()==button_multiplication){

			if(op==5){}

			else{

				if(count_multiplication==0){

					num_record=Double.parseDouble(str);

					count_multiplication++;

				}

				else{

					num_record=num_record*Double.parseDouble(str);

				}

			}

			str="";

			text_show.setText(str);

			op=3;

		}

		if(ev.getSource()==button_division){

			if(op==5){}

			else{

				if(count_division==0){

					num_record=Double.parseDouble(str);

					count_division++;

				}

				else{

					num_record=num_record/Double.parseDouble(str);

				}

			}

			str="";

			text_show.setText(str);

			op=4;

		}

		if(ev.getSource()==button_equal){

			if(op==1){

				num_record=num_record+Double.parseDouble(str);

			}

			if(op==2){

				num_record=num_record-Double.parseDouble(str);

			}

			if(op==3){

				num_record=num_record*Double.parseDouble(str);

			}

			if(op==4){

				num_record=num_record/Double.parseDouble(str);

			}

			if(num_record-(int)num_record==0){

				text_show.setText(""+(int)num_record);

			}

			else{

				text_show.setText(""+num_record);

			}

			op=5;

		}

	}

	//窗体事件监听

	public class WinClose implements WindowListener {

		public void windowOpened(WindowEvent e) {}

		public void windowClosing(WindowEvent e) {

			System.exit(0);

		}

		public void windowClosed(WindowEvent e) {}

		public void windowIconified(WindowEvent e) {}

		public void windowDeiconified(WindowEvent e) {}

		public void windowActivated(WindowEvent e) {}

		public void windowDeactivated(WindowEvent e) {}

	}

}

package com.rgy.Test;

import com.rgy.entity.*;

public class Test {

	public static void main(String args[]){

		new Computer();

	}

}