Calculator Application Design Top-Down

Source Code

 import javax.swing.*;  
 import java.awt.event.*;  
 class Calc implements ActionListener  
 {  
   JFrame f;  
   JTextField t;  
   JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b0,bdiv,bmul,bsub,badd,bdec,beq,bdel,bclr;  
   static double a=0,b=0,result=0;  
   static int operator=0;  
   Calc()  
   {  
     f=new JFrame("Calculator");  
     t=new JTextField();  
     b1=new JButton("1");  
     b2=new JButton("2");  
     b3=new JButton("3");  
     b4=new JButton("4");  
     b5=new JButton("5");  
     b6=new JButton("6");  
     b7=new JButton("7");  
     b8=new JButton("8");  
     b9=new JButton("9");  
     b0=new JButton("0");  
     bdiv=new JButton("/");  
     bmul=new JButton("*");  
     bsub=new JButton("-");  
     badd=new JButton("+");  
     bdec=new JButton(".");  
     beq=new JButton("=");  
     bdel=new JButton("Delete");  
     bclr=new JButton("Clear");  
     t.setBounds(30,40,280,30);  
     b7.setBounds(40,100,50,40);  
     b8.setBounds(110,100,50,40);  
     b9.setBounds(180,100,50,40);  
     bdiv.setBounds(250,100,50,40);  
     b4.setBounds(40,170,50,40);  
     b5.setBounds(110,170,50,40);  
     b6.setBounds(180,170,50,40);  
     bmul.setBounds(250,170,50,40);  
     b1.setBounds(40,240,50,40);  
     b2.setBounds(110,240,50,40);  
     b3.setBounds(180,240,50,40);  
     bsub.setBounds(250,240,50,40);  
     bdec.setBounds(40,310,50,40);  
     b0.setBounds(110,310,50,40);  
     beq.setBounds(180,310,50,40);  
     badd.setBounds(250,310,50,40);  
     bdel.setBounds(60,380,100,40);  
     bclr.setBounds(180,380,100,40);  
     f.add(t);  
     f.add(b7);  
     f.add(b8);  
     f.add(b9);  
     f.add(bdiv);  
     f.add(b4);  
     f.add(b5);  
     f.add(b6);  
     f.add(bmul);  
     f.add(b1);  
     f.add(b2);  
     f.add(b3);  
     f.add(bsub);  
     f.add(bdec);  
     f.add(b0);  
     f.add(beq);  
     f.add(badd);  
     f.add(bdel);  
     f.add(bclr);  
     f.setLayout(null);  
     f.setVisible(true);  
     f.setSize(350,500);  
     f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
     f.setResizable(false);  
     b1.addActionListener(this);  
     b2.addActionListener(this);  
     b3.addActionListener(this);  
     b4.addActionListener(this);  
     b5.addActionListener(this);  
     b6.addActionListener(this);  
     b7.addActionListener(this);  
     b8.addActionListener(this);  
     b9.addActionListener(this);  
     b0.addActionListener(this);  
     badd.addActionListener(this);  
     bdiv.addActionListener(this);  
     bmul.addActionListener(this);  
     bsub.addActionListener(this);  
     bdec.addActionListener(this);  
     beq.addActionListener(this);  
     bdel.addActionListener(this);  
     bclr.addActionListener(this);  
   }  
   public void actionPerformed(ActionEvent e)  
   {  
     if(e.getSource()==b1)  
       t.setText(t.getText().concat("1"));  
     if(e.getSource()==b2)  
       t.setText(t.getText().concat("2"));  
     if(e.getSource()==b3)  
       t.setText(t.getText().concat("3"));  
     if(e.getSource()==b4)  
       t.setText(t.getText().concat("4"));  
     if(e.getSource()==b5)  
       t.setText(t.getText().concat("5"));  
     if(e.getSource()==b6)  
       t.setText(t.getText().concat("6"));  
     if(e.getSource()==b7)  
       t.setText(t.getText().concat("7"));  
     if(e.getSource()==b8)  
       t.setText(t.getText().concat("8"));  
     if(e.getSource()==b9)  
       t.setText(t.getText().concat("9"));  
     if(e.getSource()==b0)  
       t.setText(t.getText().concat("0"));  
     if(e.getSource()==bdec)  
       t.setText(t.getText().concat("."));  
     if(e.getSource()==badd)  
     {  
       a=Double.parseDouble(t.getText());  
       operator=1;  
       t.setText("");  
     }   
     if(e.getSource()==bsub)  
     {  
       a=Double.parseDouble(t.getText());  
       operator=2;  
       t.setText("");  
     }  
     if(e.getSource()==bmul)  
     {  
       a=Double.parseDouble(t.getText());  
       operator=3;  
       t.setText("");  
     }  
     if(e.getSource()==bdiv)  
     {  
       a=Double.parseDouble(t.getText());  
       operator=4;  
       t.setText("");  
     }  
     if(e.getSource()==beq)  
     {  
       b=Double.parseDouble(t.getText());  
       switch(operator)  
       {  
         case 1: result=a+b;  
           break;  
         case 2: result=a-b;  
           break;  
         case 3: result=a*b;  
           break;  
         case 4: result=a/b;  
           break;  
         default: result=0;  
       }  
       t.setText(""+result);  
     }  
     if(e.getSource()==bclr)  
       t.setText("");  
     if(e.getSource()==bdel)  
     {  
       String s=t.getText();  
       t.setText("");  
       for(int i=0;i<s.length()-1;i++)  
       t.setText(t.getText()+s.charAt(i));  
     }      
   }  
   public static void main(String...s)  
   {  
     new Calc();  
   }  
 }  

Source : http://www.thecrazyprogrammer.com/2014/06/program-to-create-calculator-using-java-swing.html

Use Case

Class Diagram

CRC Card

Class Calc

Responsibilities	Collabolator
Allow user to set operand
Allow user to add operand
Allow user to substract operand
Allow user to multiply operand
Allow user to divide operand
Allow user to add decimal point to operand
Allow user to delete operand
Allow user to clear the display

Sequence Diagram

Activity Diagram

Ahmad Bilal
5114100121
PPL C