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Thread: Can't add a method without getting errors

  1. #1
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    Default Can't add a method without getting errors

    Hey I want to add the following method...
    	private static double Calculations(String Operator)
    {
    	return
    }

    ... to this program as follows (down at the bottom of this snippet)
    import javax.swing.*;
    import java.awt.event.*;
    import java.awt.*;
     
     
     
    class MyFrame extends JFrame
    {
    		JTextField ScreenOut;
    		JTextField ScreenIn;
     
    	public MyFrame()
    	{
    		//frame settings
    		setVisible (true);
    		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		setTitle("trololo");
    		setLocation(300,300);
    		setSize(300, 300);
     
    		//declarations
    		JButton[][] Keypad = new JButton[4][4];
    		String[][] KeypadLabels = {{"7","4","1","0"},{"8","5","2","C"},{"9","6","3","!"},{"+","-","*","="}};
    		JMenuBar Toolbar = new JMenuBar();
    		JMenu Options = new JMenu("Options");
    		JPanel Section1 = new JPanel();
    		JPanel Section2 = new JPanel();
    		JPanel Section3 = new JPanel();
     
     
    		//containers
    		java.awt.Container c = getContentPane();
    		c.setLayout(new java.awt.FlowLayout());
    		ScreenOut = new JTextField("", 15);
    		ScreenIn = new JTextField("", 15);
    		Section1.setLayout(new java.awt.FlowLayout());
    		Section1.add(ScreenIn);
    		Section2.setLayout(new java.awt.GridLayout(4,4));
    		Section3.setLayout(new java.awt.FlowLayout());
    		Section3.add(ScreenOut);
    		c.add(Section1);
    		c.add(Section2);
    		c.add(Section3);
    		Toolbar.add(Options);
    		setJMenuBar(Toolbar);
     
     
    		//keypad
    		for (int col =0; col<4;col++)
    		{
    			for (int row = 0; row<4;row++)
    			{
    				Keypad[col][row] = new JButton("");
    				Section2.add(Keypad[col][row]);;
    				Keypad[col][row].setLabel(KeypadLabels[row][col]);
    			}
    		}
     
    		//add functionality to numbers
    		for (int col=0;col<3;col++)
    		{
    			for (int row=0; row<3;row++)
    			{
    				Keypad[col][row].addActionListener(
    						new ActionListener()
    					{
     
    						public void actionPerformed(ActionEvent e)
    							{
    								JButton b = (JButton) e.getSource();
    								String Input = b.getLabel();
    								String Original = ScreenIn.getText();
    								ScreenIn.setText(Original + Input);
    							}
    					});
    			}
    		}
     
    		Keypad[3][0].addActionListener(
    			new ActionListener()
    			{
    				public void actionPerformed(ActionEvent e)
    				{
    					String Input = "0";
    					String Original = ScreenIn.getText();
    					ScreenIn.setText(Original + "0");
    				}
    			} );
     
    			//add functionailty to operators
    		for (int count=0; count<4; count++)
    			{
    				Keypad[count][3].addActionListener(
    					new ActionListener()
    					{
    						public void actionPerformed(ActionEvent e)
    						{
    							JButton b  = (JButton) e.getSource();
    							String s = b.getLabel();
    //							Calculations(s);
    						}
    					} ) ;
    			}
    	}
     
    ////	private static double Calculations(String Operator)
    ////	{
    ////				return
    ////	}   //this is line 109
     
    }//this is line 111

    class calculator
    {
    	public static void main(String Args[])
    	{
    		MyFrame f1 = new MyFrame();
    	}
    }

    Whenever I uncomment the method I get the following error
    --------------------Configuration: <Default>--------------------
    C:\Users\Peter\Documents\Peter\University\CSC 1011\Calculator\MyFrame.java:109: illegal start of expression
    }
    ^
    C:\Users\Peter\Documents\Peter\University\CSC 1011\Calculator\MyFrame.java:111: reached end of file while parsing
    }
    Process completed.
    I don't understand why though, whats wrong?
    Thanks in advance


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Can't add a method without getting errors

    You need a semicolon after return.

    But even if you fix that error, you still need to return a double from that method.
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  3. The Following User Says Thank You to KevinWorkman For This Useful Post:

    petemyster (April 15th, 2011)

  4. #3
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    Default Re: Can't add a method without getting errors

    Quote Originally Posted by KevinWorkman View Post
    You need a semicolon after return.

    But even if you fix that error, you still need to return a double from that method.
    Thanks, just made it return 1.2; for testing purposes.

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