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Thread: Methods

  1. #1
    Junior Member
    Join Date
    Mar 2020
    Location
    Wales UK
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    Default Methods

    I have made a Method the problem is that I can't get it to work when I place it in my project.
    Either written the Method wrong or placing it in the wrong place in the project.
    My Method
           void getSecond(int secondNum){
            displayTable.setText("\n"); //Clear the displayTable 
            int firstNum, answerNum;
                for (firstNum = 1; firstNum <=12; firstNum ++){
                    answerNum = firstNum * secondNum;
                    displayTable.append(firstNum + " x " + secondNum + " = " + answerNum +"\n");
                 }
    My Project
    import javax.swing.*;
    import java.awt.Color;
    import java.awt.Font;
    import javax.swing.BorderFactory; 
    import javax.swing.border.Border;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
     
    public class MyTables
    {
     
    	public static void main(String[] args) 
    	{
    		JFrame frame = new JFrame("Tables"); // Creating instance of JFrame
            frame.setSize(800, 600); // Setting the width and height of frame
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    		JPanel panel = new JPanel(); //Creating panel. Inside panels we can add textfields, buttons and other components.
    		panel.setBorder(BorderFactory.createLineBorder(Color.RED));
            frame.add(panel); // Add panel to frame
            placeComponents(panel);  //Call user defined method for adding components to the panel.
    		frame.setVisible(true); // Setting the frame visibility to true
        }
     
    	private static void placeComponents(JPanel panel) 
    	{
    			panel.setLayout(null);
    			JTextArea displayTable = new JTextArea("Text Area");
    			displayTable.setEditable(false);
    			displayTable.setColumns(20);
    			displayTable.setFont(new Font("Times New Roman", 1, 14));
    			displayTable.setLineWrap(true);
    			displayTable.setRows(14);
    			displayTable.setWrapStyleWord(true);
    			displayTable.setBounds(200,20,230,260); 
    			displayTable.setBorder(BorderFactory.createLineBorder(Color.GREEN));
    			displayTable.setMaximumSize(new java.awt.Dimension(5, 22));
    			panel.add(displayTable);
     
    			JLabel userLabel = new JLabel("Enter a Number");  // Creating JLabel
    			userLabel.setHorizontalAlignment(SwingConstants.CENTER);
    			userLabel.setFont(new Font("Verdana", Font.ITALIC, 16)); //set font
    			userLabel.setBounds(10,20,180,25); // Specifies the location and size of component. (x,y,x1,y1)
    			userLabel.setBorder(BorderFactory.createLineBorder(Color.BLUE));	
    			panel.add(userLabel); // Add Label to panel
     
    			JTextField userText = new JTextField(20); //Create a textfield
    			userText.setBounds(10,50,165,25);
    			panel.add(userText); // Add TextField to pane
     
    			JButton loginButton = new JButton("Enter"); // Create button
    			loginButton.setBounds(10, 80, 80, 25);
    			panel.add(loginButton); // Add loginButton to panel
     
     
    		loginButton.addActionListener(new ActionListener()
    		{
    			public void actionPerformed(ActionEvent e)
    				{
    					//getSecond(6);
    					displayTable.setText("Button Pressed");
    				}
     
    		});
        }		
    }

  2. #2
    Junior Member
    Join Date
    Mar 2020
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    Default Re: Methods

    First two things I notice in your code:

    public void actionPerformed(ActionEvent e)
    {
    //getSecond(6);
    displayTable.setText("Button Pressed");
    }

    1. getSecond(6) is commented out but I'm sure this was done on purpose.
    2. setText(...) will delete the previous contents of the displayTable and replace it with the given string.

    Try removing the setText(...) and commenting out getSecond(6)

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