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Thread: calculator GUI needs to compute

  1. #1
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    Default calculator GUI needs to compute

    import java.awt.*;
    import java.awt.Color.*;
    import java.awt.TextField.*;
    import java.awt.event.*;
    public class Calculator extends WindowAdapter
    {
    	//declaraion of variable types
    	Frame f;
    	TextField tf;
     
    	Button  b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16;
    	Panel west, center;
     
    	public void makeCALC()
    	{
    		f = new Frame("Calculate it");
    		tf = new TextField("0.0");
     
    //assigning values to buttons
    		b1 = new Button("7");
    		b2 = new Button("8");
    		b3 = new Button("9");
    		b4 = new Button("/");
    		b5 = new Button("4");
    		b6 = new Button("5");
    		b7 = new Button("6");
    		b8 = new Button("*");
    		b9 = new Button("1");
    		b10 = new Button("2");
    		b11 = new Button("3");
    		b12 = new Button("-");
    		b13 = new Button("0");
    		b14 = new Button("=");
    		b15 = new Button(".");
    		b16 = new Button("+");
    //setting up alignment and layout of grid
    		west = new Panel();
    		center = new Panel();
    		center.setLayout(new GridLayout(4,4));
    		f.add(tf,BorderLayout.NORTH);
    		f.add(west,BorderLayout.WEST);
    		f.add(center,BorderLayout.CENTER);
     
    		center.add(b1);
    		center.add(b2);
    		center.add(b3);
    		center.add(b4);
    		center.add(b5);
    		center.add(b6);
    		center.add(b7);
    		center.add(b8);
    		center.add(b9);
    		center.add(b10);
    		center.add(b11);
    		center.add(b12);
    		center.add(b13);
    		center.add(b14);
    		center.add(b15);
    		center.add(b16);
    		f.setSize(500,500);
    		f.setVisible(true);
     
    //formating of font and color of numbers
    		Font font = new Font("Verdana", Font.BOLD,40);
    		f.setFont(font);
    		b1.setForeground(Color.BLUE);
    		b2.setForeground(Color.YELLOW);
    		b3.setForeground(Color.DARK_GRAY);
    		b4.setForeground(Color.RED);
    		b5.setForeground(Color.GREEN);
    		b6.setForeground(Color.CYAN);
    		b7.setForeground(Color.LIGHT_GRAY);
    		b8.setForeground(Color.ORANGE);
    		b9.setForeground(Color.RED);
    		b10.setForeground(Color.PINK);
    		b11.setForeground(Color.GRAY);
    		b12.setForeground(Color.MAGENTA);
    		b13.setForeground(Color.WHITE);
    		b14.setForeground(Color.YELLOW);
    		b15.setForeground(Color.ORANGE);
    		b16.setForeground(Color.PINK);
     
    //method caller for buttons and frame
    		f.addWindowListener(this);
    		b1.addActionListener(new MyButtonHandler());
    		b2.addActionListener(new MyButtonHandler());
    		b3.addActionListener(new MyButtonHandler());
    		b4.addActionListener(new MyButtonHandler());
    		b5.addActionListener(new MyButtonHandler());
    		b6.addActionListener(new MyButtonHandler());
    		b7.addActionListener(new MyButtonHandler());
    		b8.addActionListener(new MyButtonHandler());
    		b9.addActionListener(new MyButtonHandler());
    		b10.addActionListener(new MyButtonHandler());
    		b11.addActionListener(new MyButtonHandler());
    		b12.addActionListener(new MyButtonHandler());
    		b13.addActionListener(new MyButtonHandler());
    		b14.addActionListener(new MyButtonHandler());
    		b15.addActionListener(new MyButtonHandler());
    		b16.addActionListener(new MyButtonHandler());
     
     
    }
    //calling method to allow window to close
     
    	public void windowClosing(WindowEvent we)
    	{
    		System.exit(0);
    }
    	public class MyButtonHandler implements ActionListener
    	{
    		public void actionPerformed(ActionEvent ae)
    		{
    //method to test values of label stored in button
    			String label = ae.getActionCommand();
     
    			if(label == "7")
    			{
    				tf.setText("7");
    			}
    			else if(label == "8")
    			{
    				tf.setText("8");
     
    			}
    			if(label == "9")
    			{
    				tf.setText("9");
    			}
    			else if(label == "/")
    			{
    				tf.setText("/");
    			}
    			if(label == "4")
    			{
    				tf.setText("4");
    			}
    			else if(label == "5")
    			{
    			tf.setText("5");
     
    			}
    			if(label == "6")
    			{
    			tf.setText("6");
    			}
    			else if(label == "*")
    			{
    			tf.setText("*");
     
    			}
    			else if(label == "1")
    			{
    				tf.setText("1");
    			}
    			else if(label == "2")
    			{
    				tf.setText("2");
    			}
    			else if(label == "3")
    			{
    				tf.setText("3");
    			}
    			else if(label == "-")
    			{
    				tf.setText("-");
    			}
    			else if(label == "0")
    			{
    				tf.setText("0");
    			}
    			else if(label == "=")
    			{
    				tf.setText("=");
    			}
    			else if(label == ".")
    			{
    				tf.setText(".");
    			}
    			else if(label == "+")
    			{
    				tf.setText("+");
    			}
     
    			else if(label == "Clear")
    			{
    				tf.setText("  ");
    	}
    		}
    		}//end makeGUI()
    		public static void main(String args[])
    		{
    			Calculator theNew = new Calculator();
    			theNew.makeCALC();
     
    	}
    Last edited by helloworld922; May 4th, 2010 at 12:18 PM.


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: calculator GUI needs to compute

    What is it you need help with?

  3. #3
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    Default Re: calculator GUI needs to compute

    i need the calculator to compute and do normal calculations like 3+4=7

  4. #4
    Super Moderator helloworld922's Avatar
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    Default Re: calculator GUI needs to compute

    There are multiple ways to do this.

    Here's one implementation of a simple Java calculator parser based on the Shunting Yard algorithm I made a while back: Java Calculator. This algorithm is extremely easy to implement and allows you to parse with order of operations.

    If you don't want order of operations, the parsing gets even easier:

    1. read in a token (hopefully a number, otherwise syntax error). This is operand 1
    2. read in another token (hopefully an operator, otherwise syntax error)
    3. read in another token (hopefully a number, otherwise syntax error). set this to operand 2
    4. Perform operand1 = operand1 {operator} operand2
    5. repead steps 2-4 until there are no more tokens, or there is a syntax error
    6. The answer is stored in operand1

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