import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import javax.swing.border.*; 
import java.util.LinkedList; 
import java.text.NumberFormat; 
public class ComputerPad extends Frame implements ActionListener,KeyListener 
{ 
	NumberButton numberButton[]; 
	OperationButton oprationButton[]; 
	Button 小數點按鈕,正負號按鈕,退格按鈕, 
	求倒數按鈕,等號按鈕,清零按鈕; 
	Panel panel; 
	JTextField resultShow; 
	String 運算符號[]={"+","-","*","/"}; 
	LinkedList 鏈表; 
	boolean 是否按下等號=false;


 public ComputerPad() 
 { 
    JFrame frame= new JFrame();
    鏈表=new LinkedList(); 
	numberButton=new NumberButton[10]; 
	for(int i=0;i<=9;i++) 
	{ 
		numberButton[i]=new NumberButton(i); 
		numberButton[i].addActionListener(this); 
	} 
	oprationButton=new OperationButton[4]; 
	for(int i=0;i<4;i++) 
	{ 
		oprationButton[i]=new OperationButton(運算符號[i]); 
		oprationButton[i].addActionListener(this); 
	} 
	小數點按鈕=new Button("."); 
	正負號按鈕 =new Button("+/-"); 
	等號按鈕=new Button("="); 
	求倒數按鈕=new Button("1/x"); 
	退格按鈕=new Button("退格"); 
	清零按鈕=new Button("C"); 
	清零按鈕.setForeground(Color.red); 
	退格按鈕.setForeground(Color.red); 
	等號按鈕.setForeground(Color.red); 
	求倒數按鈕.setForeground(Color.blue); 
	正負號按鈕.setForeground(Color.blue); 
	小數點按鈕.setForeground(Color.blue); 
	退格按鈕.addActionListener(this); 
	清零按鈕.addActionListener(this); 
	等號按鈕.addActionListener(this); 
	小數點按鈕.addActionListener(this); 
	正負號按鈕.addActionListener(this); 
	求倒數按鈕.addActionListener(this); 
	resultShow=new JTextField(10); 
	resultShow.setHorizontalAlignment(JTextField.RIGHT); 
	resultShow.setForeground(Color.blue); 
	resultShow.setFont(new Font("TimesRoman",Font.PLAIN,14)); 
	resultShow.setBorder(new SoftBevelBorder(BevelBorder.LOWERED)); 
	resultShow.setBackground(Color.white); 
	resultShow.setEditable(true); 
	panel=new Panel(); 
	panel.setLayout(new GridLayout(4,5)); 

	panel.add(numberButton[1]); 
	panel.add(numberButton[2]); 
	panel.add(numberButton[3]); 
	panel.add(oprationButton[0]); 
	panel.add(清零按鈕); 

	panel.add(numberButton[4]); 
	panel.add(numberButton[5]); 
	panel.add(numberButton[6]); 
	panel.add(oprationButton[1]); 
	panel.add(退格按鈕); 

	panel.add(numberButton[7]); 
	panel.add(numberButton[8]); 
	panel.add(numberButton[9]); 
	panel.add(oprationButton[2]); 
	panel.add(求倒數按鈕); 

	panel.add(numberButton[0]); 
	panel.add(正負號按鈕); 
	panel.add(小數點按鈕); 
	panel.add(oprationButton[3]); 
	panel.add(等號按鈕); 
	frame.getContentPane().add(panel,BorderLayout.CENTER); 
	frame.getContentPane().add(resultShow,BorderLayout.NORTH); 

    frame.setVisible(true); 
	frame.setBounds(100,50,240,180); 
	frame.setResizable(false); 
	frame.validate();
	resultShow.setFocusable(true);
	
 } 
   public void keyReleased(KeyEvent e)
  {
  }

  
   public void keyTyped(KeyEvent e)
  {
    	String sKey = String.valueOf ( e.getKeyChar () ) ;
	    	 	 		
  }
 
 
   public void keyPressed(KeyEvent e)
  {
  }
  public void actionPerformed(ActionEvent e) 
  { 
     

	if(e.getSource() instanceof NumberButton ) 
	{ 
		NumberButton b=(NumberButton)e.getSource(); 
		if(鏈表.size()==0) 
		{ 
			int number=b.getNumber(); 
			鏈表.add(""+number); 
			resultShow.setText(""+number); 
			是否按下等號=false; 
		} 

	   else if(鏈表.size()==1&&是否按下等號==false) 
	   { 
		   int number=b.getNumber(); 
	       String num=(String)鏈表.getFirst(); 
		   String s=num.concat(""+number); 
		   鏈表.set(0,s); 
		   resultShow.setText(s); 
	   } 
	  else if(鏈表.size()==1&&是否按下等號==true) 
	   { 
		   int number=b.getNumber(); 
		   鏈表.removeFirst(); 
		   鏈表.add(""+number); 
		   是否按下等號=false; 
		   resultShow.setText(""+number); 
	   } 
	  else if(鏈表.size()==2) 
	   { 
		   int number=b.getNumber(); 
		   鏈表.add(""+number); 
		   resultShow.setText(""+number); 
	   } 
	  else if(鏈表.size()==3) 
	   { 
		   int number=b.getNumber(); 
		   String num=(String)鏈表.getLast(); 
		   String s=num.concat(""+number); 
		   鏈表.set(2,s); 
		   resultShow.setText(s); 
	   } 
    } 
   else if(e.getSource() instanceof OperationButton) 
   { 
		OperationButton b=(OperationButton)e.getSource(); 
		if(鏈表.size()==1) 
		{ 
			String fuhao=b.get運算符號(); 
			鏈表.add(fuhao); 
		} 
		else if(鏈表.size()==2) 
		{ 
			String fuhao=b.get運算符號(); 
			鏈表.set(1,fuhao); 
		} 
		else if(鏈表.size()==3) 
		{ 
			String fuhao=b.get運算符號(); 
			String number1=(String)鏈表.getFirst(); 
			String number2=(String)鏈表.getLast(); 
			String 運算符號=(String)鏈表.get(1); 
			try 
			{ 
				double n1=Double.parseDouble(number1); 
				double n2=Double.parseDouble(number2); 
				double n=0; 
				if(運算符號.equals("+")) 
				{ 
					n=n1+n2; 
				} 
				else if(運算符號.equals("-")) 
				{ 
					n=n1-n2; 
				} 
				else if(運算符號.equals("*")) 
				{ 
					n=n1*n2; 
				} 
				else if(運算符號.equals("/")) 
				{ 
					n=n1/n2; 
				} 
				鏈表.clear(); 
				鏈表.add(""+n); 
				鏈表.add(fuhao); 
				resultShow.setText(""+n); 
			} 
			catch(Exception ee) 
			{ 
			} 
		} 
	} 
   else if(e.getSource()==等號按鈕) 
   { 
		是否按下等號=true; 
		if(鏈表.size()==1||鏈表.size()==2) 
		{ 
			String num=(String)鏈表.getFirst(); 
			resultShow.setText(""+num); 
		} 
		else if(鏈表.size()==3) 
		{ 
			String number1=(String)鏈表.getFirst(); 
			String number2=(String)鏈表.getLast(); 
			String 運算符號=(String)鏈表.get(1); 
			try 
			{ 
			    
				double n1=Double.parseDouble(number1); 
				double n2=Double.parseDouble(number2); 
				double n=0; 
				if(運算符號.equals("+")) 
				{ 
					n=n1+n2; 
				} 
				else if(運算符號.equals("-")) 
				{ 
					n=n1-n2; 
				} 
				else if(運算符號.equals("*")) 
				{ 
					n=n1*n2; 
				} 
				else if(運算符號.equals("/")) 
				{ 
					n=n1/n2; 
				} 
				resultShow.setText(""+n); 
				鏈表.set(0,""+n); 
				鏈表.removeLast(); 
				鏈表.removeLast();
				 

 			} 
		  catch(Exception ee) 
		  { 
          } 
      } 
   } 
   else if(e.getSource()==小數點按鈕) 
   { 
		if(鏈表.size()==0) 
		{ 
			是否按下等號=false; 
		} 
		else if(鏈表.size()==1) 
		{ 
			String dot=小數點按鈕.getLabel(); 
			String num=(String)鏈表.getFirst(); 
			String s=null; 
			if(num.indexOf(dot)==-1) 
			{ 
				s=num.concat(dot); 
				鏈表.set(0,s); 
			} 
			else 
			{ 
				s=num; 
			} 
			鏈表.set(0,s); 
			resultShow.setText(s); 
		} 

		else if(鏈表.size()==3) 
		{ 
			String dot=小數點按鈕.getLabel(); 
			String num=(String)鏈表.getLast(); 
			String s=null; 
			if(num.indexOf(dot)==-1) 
			{ 
				s=num.concat(dot); 
				鏈表.set(2,s); 
			} 
		else 
		{ 
			s=num; 
		} 
		resultShow.setText(s); 
	  } 
   } 
   else if(e.getSource()==退格按鈕) 
   { 
		if(鏈表.size()==1) 
		{ 
			String num=(String)鏈表.getFirst(); 
			if(num.length()>=1) 
			{ 
				num=num.substring(0,num.length()-1); 
				鏈表.set(0,num); 
				resultShow.setText(num); 
			} 
		    else 
			{ 
				鏈表.removeLast(); 
				resultShow.setText("0"); 
			} 
		} 
	   else if(鏈表.size()==3) 
	   { 
			String num=(String)鏈表.getLast(); 
			if(num.length()>=1) 
			{
				 num=num.substring(0,num.length()-1); 
				 鏈表.set(2,num); 
				 resultShow.setText(num); 
			} 
			else 
			{ 
				鏈表.removeLast(); 
				resultShow.setText("0"); 
			} 
	} 
   } 
   else if(e.getSource()==正負號按鈕) 
   { 
		if(鏈表.size()==1) 
		{ 
			String number1=(String)鏈表.getFirst(); 
			try 
			{ 
			    
				double d=Double.parseDouble(number1); 
				d=-1*d; 
				String str=String.valueOf(d); 
				鏈表.set(0,str); 
				resultShow.setText(str);
				if (d>10000||d<-10000)
                 throw new MyException(d);
                System.out.println("\t 正常退出"); 
			} 
			catch(MyException ee) 
			{ 
			    System.out.println("\t 捕獲異常："+ee.toString( ));
			} 
		} 
		else if(鏈表.size()==3) 
		{ 
			String number2=(String)鏈表.getLast(); 
			try 
			{ 
				double d=Double.parseDouble(number2); 
				d=-1*d; 
				String str=String.valueOf(d); 
				鏈表.set(2,str); 
				resultShow.setText(str);
				System.out.print(d);
				if (d>10000||d<-10000)
                 throw new MyException(d);
                System.out.println("\t 正常退出"); 
			} 
			catch(MyException ee) 
			{ 
			   System.out.println("\t 捕獲異常："+ee.toString( ));
			} 
		} 
    } 
   else if(e.getSource()==求倒數按鈕) 
   { 
		if(鏈表.size()==1||鏈表.size()==2) 
		{ 
			String number1=(String)鏈表.getFirst(); 
			try 
			{  
			   
				double d=Double.parseDouble(number1); 
				d=1.0/d; 
				String str=String.valueOf(d); 
				鏈表.set(0,str); 
				resultShow.setText(str); 
				 if (d>10000||d<-10000)
                 throw new MyException(d);
                System.out.println("\t 正常退出");
			} 
			catch(MyException ee) 
			{ 
			  System.out.println("\t 捕獲異常："+ee.toString( ));
			} 
		} 
		else if(鏈表.size()==3) 
		{ 
			String number2=(String)鏈表.getLast(); 
			try 
			{ 
				double d=Double.parseDouble(number2); 
				d=1.0/d; 
				String str=String.valueOf(d); 
				鏈表.set(0,str); 
				resultShow.setText(str);
				if (d>10000||d<-10000)
                 throw new MyException(d);
                System.out.println("h"); 
			} 
			catch(MyException ee) 
			{
				 System.out.println("\t 捕獲異常："+ee.toString( ));
			}
		}	 
	}  
   else if(e.getSource()==清零按鈕) 
   { 
		是否按下等號=false; 
		resultShow.setText("0"); 
		鏈表.clear(); 
   } 
 } 
 public static void main(String args[]) 
 { 
    new ComputerPad(); 
 }
  
}


class MyException extends Exception
{   private double detail;
    MyException(double d)
    {   detail=d;}
    public String toString( )
    {   return "MyException"+detail;}
}