mycalc.java

classical culculator but has some thing special that you can store your work in a file in the hard a

import java.awt.*;
import java.util.*;
import java.awt.event.*;
import java.applet.*;
import java.math.*;
import java.io.*;
import java.lang.*;
public class MyCalc extends Applet implements ActionListener,ItemListener,KeyListener
{

	private MyFile f=new MyFile();//class MyFile is an inner class contains the methods we used to act with the files
	private CheckboxGroup deg;
	private TextArea ta;
	private Label l,memoryTag;
	private MyButton[] button;
	private TextField t;
	private String s="0",s1="",s2="",op="",s3="";
	private double m=0,n=0,mem=0;
	private Panel p1,p2,p3,p4,p5,p6,p7,p8;
	private String[] Sbutton={"Power","Advanced","Shift","C","CE","Back Space","7","8","9","4",
                                  "5","6","1","2","3","0",".","PI","=","Ans"
                                  ,"Sin","Cos","Sqrt","Sqr","X!","Pow","%","1/X","+/-","S_Store",
                                  "E_Store","/","Del","*","Me","-","M+","+","M-","MR",
                                  "R","Previow","Close"};
	private boolean cond=false,cond1=false,cond2=false,cond3=false,cond4=false,cond5=true,pressed=false;
	
/*
	the conditions :
	1:cond  :for advanced button
	2:cond1 :for Power
	3:cond3 :for checkbox radian or degrees
	4:cond4 :for start saving and end saving into the file
	5:cond5 :for the simecolon
	5:pressed for making the textfield = "" after any calculation
	
	
*/	
	public void init()
	{
		setLayout(new BorderLayout(0,7));//the layout for the applet
		setBackground(new Color(58,110,165));
		l=new Label("                 Bad Info Guys");
		memoryTag=new Label("  ");
		memoryTag.setEnabled(true);
		l.setFont(new Font("Times Roman",Font.BOLD,17));
		memoryTag.setFont(new Font("Times Roman",Font.BOLD,17));
		memoryTag.setForeground(Color.black);
		l.setForeground(Color.green);
		l.setForeground(Color.green);
		ta=new TextArea("Bahaa Mourad\nGoergeElias\nSamer Al_Fakih\nBashar Mahasin\n-----------------------\n",8,17,TextArea.SCROLLBARS_VERTICAL_ONLY);
		ta.setFont(new Font("Times Roman",Font.BOLD,12));
		ta.setEditable(false);
		deg = new CheckboxGroup();//the container of the checkboxs
		Checkbox degrees = new Checkbox("Deg",deg,true);
		Checkbox radians = new Checkbox("Rad",deg,false);
		button =new MyButton[43];
		for(int i=0;i<20;i++)//creating the Advanced buttons like sin & cos & arcsin etc..
			button[i]=new MyButton(Sbutton[i],new Color(174,168,217));
		for(int i=20;i<43;i++)//creating the numbers 
			button[i]=new MyButton(Sbutton[i],new Color(58,222,160));
			
		t=new TextField(30);
		t.setFont(new Font("Times Roman",Font.BOLD,12));
		t.addKeyListener(this);
		t.setText("0");
		
		//constructin the panels in the applet
		p1=new Panel();
		p2=new Panel();
		p3=new Panel();
		p4=new Panel();
		p5=new Panel();
		p6=new Panel();
		p7=new Panel();
		p8=new Panel();
//adding the components  to matching panel
		p5.setBounds(20,1,275,30);
		p5.add(button[0]);
		p5.add(l);
		add(p5);

		p1.setLayout(new GridLayout(3,3,2,2));
		p1.setBounds(20,104,225,78);
		for(int i=20;i<29;i++)
			p1.add(button[i]);
                p1.setVisible(false);
                add(p1);


		p2.setBounds(20,32,280,70);
		p2.add(t);
		p2.add(memoryTag);
		p2.add(p4);
		p4.add(button[1]);
		p4.add(button[2]);
		p4.add(degrees);
		p4.add(radians);
		t.setBackground(Color.black);
		add(p2);


		p3.setLayout(new GridLayout(6,3,2,3));
		p3.setBounds(20,190,225,156);
		for (int i=3;i<20;i++)
			p3.add(button[i]);
                add(p3);


		p7.setBounds(300,1,150,182);
		p7.add(ta);
		p7.add(button[41]);
		p7.add(button[42]);
		add(p7);


		p6.setLayout(new GridLayout(6,2,2,2));
		p6.setBounds(300,190,150,156);
		p8.setBounds(0,0,400,40);
		for(int i=29;i<41;i++)
			p6.add(button[i]);

		add(p6);

		add(p8);
//befor you can use the Calculator you have to press the power
		for(int i=1;i<43;i++)
			button[i].setEnabled(false);
		t.setEditable(false);
//adding the action listener		
		for(int i=0;i<43;i++)
			button[i].addActionListener(this);
		degrees.addItemListener(this);
		radians.addItemListener(this);

	}
//this procedure compute the calculation needed
	public void calculate()
	{
				double l=0;
				int o=0;
				String opp="";
				s2=s;
				s="0";
				m=Double.valueOf(s1).doubleValue();
				n=Double.valueOf(s2).doubleValue();
				opp=op;

				if (op.compareTo("+")==0)
					{
						l=m+n;
						op="";
					}
				else if (op.compareTo("-")==0)
					{
						l=m-n;
						op="";
					}
				else if (op.compareTo("*")==0)
					{
						l=m*n;
						op="";
					}
				else if (op.compareTo("/")==0)
					{
						l=m/n;
						op="";
					}
				else if (op.compareTo("")==0)
					{
						l=Double.valueOf(s2).doubleValue();
					}

				else if (op.compareTo("Pow")==0)
					{
						o=Integer.valueOf(s2).intValue();
						l=MyMath.mypow(m,o);
						op="";
					}
				cond5=true;
				pressed=true;
				s=""+l;
				t.setText(s);
				f.addTofile(s1+opp+s2+"="+l);

			}

	public void keyPressed(KeyEvent e)
	{
			
		double ac=e.getKeyCode();

		if((ac==13)||(ac==10))
			calculate();
		else if(ac==8)
			{
				if(s.compareTo("")==0)
					t.setText("Error");
				else
					{
						s=s.substring(0,s.length()-1);
						t.setText(s);
					}
			}
	}
	public void keyTyped(KeyEvent e)
	{
		char ch;
		ch=e.getKeyChar();
		if ((ch=='1')||(ch=='2')||(ch=='3')||(ch=='4')||(ch=='5')||(ch=='6')||(ch=='7')||(ch=='8')||(ch=='9')||(ch=='0'))
		{   if(pressed)
			{
				s="0";
				pressed=false;
			}
			if(s=="0")
				s=""+ch;
			else s=s+ch;
		}
		else if(ch=='.'&&cond5)
		{
			if(pressed)
			{
				s="0";
				pressed=false;
			}
			s=s+ch;
			cond5=false;
		}
		else if((ch=='+')||(ch=='-')||(ch=='*')||(ch=='/'))
			{
				op=""+ch;
				s1=s;
				s="0";
			}
			else if(ch=='=')
				calculate();

		t.setText(s);
	}
	public void keyReleased(KeyEvent e)
	{
	}

	public void itemStateChanged(ItemEvent e)
	{
	}
	public void actionPerformed(ActionEvent e)
	{
		if (e.getSource()==button[29])//for begin store in the file
		{
			cond4=true;
			button[30].setEnabled(true); 
			button[29].setEnabled(false);
			f.CreateFile();
		}
		else if (e.getSource()==button[30])//end of the storing 
		{
			cond4=false;
			button[29].setEnabled(true);
			button[30].setEnabled(false);
			f.endStore();

		}
		else if (e.getSource()==button[41])//preview
		{
			button[41].setEnabled(false);
			button[42].setEnabled(true);
			f.WriteFileOnTextArea();
		}
		else if (e.getSource()==button[42])//close for textarea
		{
			button[41].setEnabled(true);
			button[42].setEnabled(false);
			ta.setText("Bahaa Mourad\nGoergeElias\nSamer Al_Fakih\nBashar Mahasin\n-----------------------\n");
		}
		else if (e.getSource()==button[32])//Del button
		{
			f.CreateFile();
		}
		else if (e.getSource()==button[1])//for advanced buttons
		{
			if(!cond)
			{
				cond=true;
				p1.setVisible(true);
				button[1].setLabel("Simple");
				for(int i=20;i<29;i++)
						button[i].setEnabled(true);
			}
			else
			{
				button[1].setLabel("Advanced");
				p1.setVisible(false);
				cond=false;
			}
		}
		else if (e.getSource()==button[0])//power 
		{
			if(!cond1)
			{
				cond5=true;
				t.setBackground(Color.white);
				cond1=true;
				button[0].setLabel("OFF");
				for(int i=1;i<42;i++)
					button[i].setEnabled(true);
				button[30].setEnabled(false);
			}
			else
			{
				cond1=false;
				cond5=true;
				pressed=false;
				t.setBackground(Color.black);
				ta=new TextArea("Bahaa Mourad\nGoergeElias\nSamer Al_Fakih\nBashar Mahasin\n-----------------------\n");
				f.delFile();
				s="0";s1="";s2="";
				memoryTag.setText(" ");
				t.setText(s);
				mem=0;
				button[0].setLabel("ON");
				for(int i=1;i<43;i++)
					button[i].setEnabled(false);
			}
		}
		else if(e.getSource()==button[16])//semicolon
			{
				if(pressed)
				{
					s="0";
					pressed=false;
				}
				if (cond5)
				{
					s=s+".";
					cond5=false;
					t.setText(s);
				}
			}
//The implemetation of the Number Buttons
		else if ((e.getSource()==button[6]) || (e.getSource()==button[7]) || (e.getSource()==button[8]) || (e.getSource()==button[9]) || (e.getSource()==button[10]) || (e.getSource()==button[11]) || (e.getSource()==button[12]) || (e.getSource()==button[13]) || (e.getSource()==button[14]) ||(e.getSource()==button[15]) )
		{	if(pressed)
			{
				s="0";
				pressed=false;
			}
			if(s.compareTo("0")==0)
				s=e.getActionCommand();
			else s=s+e.getActionCommand();
			s3=s;
			t.setText(s);
			showStatus(e.getActionCommand());

		}
//the opertor section (simple opertaion)		
		else if ((e.getSource()==button[37])||(e.getSource()==button[35])||(e.getSource()==button[33])||(e.getSource()==button[31])||(e.getSource()==button[25]))
		{
			cond5=true;
			op=e.getActionCommand();
			s1=s;
			s3=s;
			s="0";
			t.setText(s);
		}
		else if ((e.getSource()==button[18]))
			calculate();
		else if (e.getSource()==button[5])
		{
			s=s.substring(0,s.length()-1);
			t.setText(s);
		}
		else if (e.getSource()==button[3])
		{
			op="";
			s=s3;
			t.setText(s);
		}
		else if (e.getSource()==button[4])
		{
			t.setText("0");
			cond5=true;
			s="0";
			s1="";
			s2="";
		}
		else if (e.getSource()==button[27])
		{
			pressed=true;
			float g=0,p=0;
			p=Float.valueOf(s).floatValue();
			if(p==0)
			{
				s="0";
				t.setText("Invinite");
			}
			else{
			g=(1/p);
			s=""+g;
			s3=s;
			t.setText(s);
			f.addTofile("1/"+p+"="+s);
		}
		}
		else if (e.getSource()==button[28])
		{
            if (!(s.compareTo("0")==0))
            {
                if(s.charAt(0)=='-')
				s=s.substring(1,s.length());
            else
                s="-"+s;
                t.setText(s);
            }
        }
		else if(e.getSource()==button[34])
		{