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Thread: Need Help with using classes [HELP]

  1. #1
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    Question Need Help with using classes [HELP]

    Alright so i am new to the forums and sort of a beginner. I need to use a different class in my program.

    I need to use this:
    /*
     * To change this template, choose Tools | Templates
     * and open the template in the editor.
     */
     
    /*
     * CelsiusConverterGUI.java
     *
     * Created on Mar 5, 2011, 12:59:24 AM
     */
    /**
     *
     * @author Andrew
     */
    public class CelsiusConverterGUI extends javax.swing.JFrame {
     
        /** Creates new form CelsiusConverterGUI */
        public CelsiusConverterGUI() {
            initComponents();
        }
     
        /** This method is called from within the constructor to
         * initialize the form.
         * WARNING: Do NOT modify this code. The content of this method is
         * always regenerated by the Form Editor.
         */
        @SuppressWarnings("unchecked")
        // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
        private void initComponents() {
     
            X1label = new javax.swing.JLabel();
            Y1label = new javax.swing.JLabel();
            X2label = new javax.swing.JLabel();
            Y2label = new javax.swing.JLabel();
            X1field = new javax.swing.JTextField();
            Y1field = new javax.swing.JTextField();
            X2field = new javax.swing.JTextField();
            Y2field = new javax.swing.JTextField();
            MathButton = new javax.swing.JButton();
            answerlabel = new javax.swing.JLabel();
            answerlabel1 = new javax.swing.JLabel();
            endlabel = new javax.swing.JLabel();
     
            setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
            setTitle("Math Y2-Y1/ X2-X1");
     
            X1label.setFont(new java.awt.Font("Tahoma", 0, 12));
            X1label.setText("X1");
     
            Y1label.setText("Y1");
     
            X2label.setText("X2");
     
            Y2label.setText("Y2");
     
            MathButton.setText("Do Math");
            MathButton.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    MathButtonActionPerformed(evt);
                }
            });
     
            answerlabel.setText("Answer");
     
            answerlabel1.setText("y-intercept Answer");
     
            javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
            getContentPane().setLayout(layout);
            layout.setHorizontalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                    .addContainerGap()
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(layout.createSequentialGroup()
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                                .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
                                    .addComponent(X2label)
                                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                    .addComponent(X2field, javax.swing.GroupLayout.DEFAULT_SIZE, 125, Short.MAX_VALUE))
                                .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
                                    .addComponent(X1label)
                                    .addGap(2, 2, 2)
                                    .addComponent(X1field, javax.swing.GroupLayout.DEFAULT_SIZE, 125, Short.MAX_VALUE)))
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED))
                        .addGroup(layout.createSequentialGroup()
                            .addComponent(MathButton)
                            .addGap(66, 66, 66)))
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(endlabel)
                        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(answerlabel1)
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addComponent(answerlabel)
                                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addGroup(layout.createSequentialGroup()
                                        .addComponent(Y1label)
                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                        .addComponent(Y1field, javax.swing.GroupLayout.DEFAULT_SIZE, 125, Short.MAX_VALUE))
                                    .addGroup(layout.createSequentialGroup()
                                        .addComponent(Y2label)
                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                        .addComponent(Y2field, javax.swing.GroupLayout.DEFAULT_SIZE, 125, Short.MAX_VALUE))))))
                    .addContainerGap())
            );
            layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(X1label)
                        .addComponent(Y1label)
                        .addComponent(Y1field, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(X1field, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGap(7, 7, 7)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(X2label)
                        .addComponent(X2field, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(Y2label)
                        .addComponent(Y2field, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(MathButton)
                        .addComponent(answerlabel))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addComponent(answerlabel1)
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addComponent(endlabel)
                    .addContainerGap(46, Short.MAX_VALUE))
            );
     
            pack();
        }// </editor-fold>                        
     
        private void MathButtonActionPerformed(java.awt.event.ActionEvent evt) {                                           
        int X1 = (int)(Double.parseDouble(X1field.getText()));
        int X2 = (int)(Double.parseDouble(X2field.getText()));
        int Y1 = (int)(Double.parseDouble(Y1field.getText()));
        int Y2 = (int)(Double.parseDouble(Y2field.getText()));
        int answer = Y2 - Y1;
        int answer1 = X2 - X1;
        int answer3 = answer / answer1;
        answerlabel.setText("m = "+ answer + "/" + answer1);
        int b;
        int answer2 = b = Y1 - (answer3 * X1);
        answerlabel1.setText("b = " + answer2);
        endlabel.setText("Y="+ answer3 +"X+"+ answer2);
        }                                          
        /**
        * @param args the command line arguments
        */
        public static void main(String args[]) {
            java.awt.EventQueue.invokeLater(new Runnable() {
                public void run() {
                    new CelsiusConverterGUI().setVisible(true);
                }
            });
        }
     
        // Variables declaration - do not modify                     
        private javax.swing.JButton MathButton;
        private javax.swing.JTextField X1field;
        private javax.swing.JLabel X1label;
        private javax.swing.JTextField X2field;
        private javax.swing.JLabel X2label;
        private javax.swing.JTextField Y1field;
        private javax.swing.JLabel Y1label;
        private javax.swing.JTextField Y2field;
        private javax.swing.JLabel Y2label;
        private javax.swing.JLabel answerlabel;
        private javax.swing.JLabel answerlabel1;
        private javax.swing.JLabel endlabel;
        // End of variables declaration                   
     
    }

    In this: (under the h == 0)
    import java.awt.event.KeyEvent;
    import java.awt.event.KeyListener;
    import java.util.Scanner;
     
    public class Graphing{
    	static Scanner input = new Scanner(System.in);
     
    	public static void main(String[] args) {
    		int h;
    		System.out.println("Enter the equation you want to do: ");
    		System.out.println("If you want the Equation y = mx + b type 0.");
    		System.out.println("If you want to know what your grade was on a test type 1.");
    		h = input.nextInt();
     
    		if(h == 0){
     
    		}
     
     
    		if(h == 1){
    			double grade, questions, answered, percent;
    			System.out.println("Enter the total possible points: ");
    			questions = input.nextDouble();
     
    			System.out.println("Enter the total points earned: ");
    			answered = input.nextDouble();
     
    			percent = answered/questions;
     
    			grade = percent * 100;
    			System.out.println("The number of your grade was a " + grade);
     
    			if (grade >= 97)
    				System.out.print("Your grade is an A+");
    			else if (grade >= 93)
    				System.out.println("Your grade is an A");
    			else if (grade >= 90)
    				System.out.println("Your grade is a A-");	
    			else if (grade >= 87)
    				System.out.println("Your grade is a B+");	
    			else if (grade >= 83)
    				System.out.println("Your grade is a B");
    			else if (grade >= 80)
    				System.out.println("Your grade is a B-");	
    			else if (grade >= 77)
    				System.out.println("Your grade is a C+");	
    			else if (grade >= 73)
    				System.out.println("Your grade is a C");
    			else if (grade >= 70)
    				System.out.println("Your grade is a C-");	
    			else if (grade >= 65)
    				System.out.println("Your grade is a D");	
    			else
    				System.out.print("Your grade is a F");
    		}
     
    		if(h == 2){
    			int inputGraph, x, y, m;
     
    			System.out.println("Enter the x axis: ");
    			x = input.nextInt();
     
    			System.out.println("Enter the y axis: ");
    			y = input.nextInt();
     
    			System.out.println("The x axis is = " + x);
    			System.out.println("===================================");
    			System.out.println("The y axis is = " + y);
    		}
     
    	}
     
    }

    please DONT LEACH MY CODE.

    but maybe it would be easier if i made it in a seperate file so there isnt soo much code.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Need Help with using classes [HELP]

    I need to use a different class in my program.
    Can you explain what "to use" means here? Most of a java program is made up of different usages of classes.
    To create an instance of a class, use the new statement.

  3. #3
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    Default Re: Need Help with using classes [HELP]

    Feel free to ask a question.

  4. #4
    mmm.. coffee JavaPF's Avatar
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    Default Re: Need Help with using classes [HELP]

    Hello dragon40226,

    Welcome to the Java Programming Forums.

    It's easy to make the CelsiusConverterGUI class run from within the Graphing class.

    As you know, a programs starting point is the main method. Because Graphing is our main class where the program will run, there is no need for CelsiusConverterGUI to have a main method. The contents of the CelsiusConverterGUI main method are still needed but we need to rename it so we can call it.

    Below is the original main method of the CelsiusConverterGUI class.
    You can see how I have renamed it to start() and removed the methods arguments.

        public static void main(String args[]) {
            java.awt.EventQueue.invokeLater(new Runnable() {
                public void run() {
                    new CelsiusConverterGUI().setVisible(true);
                }
            });
        }

        public static void start() {
            java.awt.EventQueue.invokeLater(new Runnable() {
                public void run() {
                    new CelsiusConverterGUI().setVisible(true);
                }
            });
        }

    Now we have this start method, you can call it from your Graphing class.

    		if(h == 0){
     
    			CelsiusConverterGUI CCG = new CelsiusConverterGUI();
    			CCG.start();
     
    		}

    I hope this is what you mean
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  5. The Following User Says Thank You to JavaPF For This Useful Post:

    dragon40226 (May 19th, 2011)

  6. #5
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    Default Re: Need Help with using classes [HELP]

    Thank you Very much! JavaPF!

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