SRL Archive - Java Help and Tutorials

Well, I'm very new to Java, and this is what a tutorial taught me to do :)

Pretty simple, just converts celsius to fahrenheit.

I may work on it and make it do the other way around.

EDIT: Found out how to make it an exacutable .jar so uploaded.

where is the program? :confused:

Can't seem to make it work as a .jar file, can't put them on here :s

I'll just post the code for now.

I'll just post the code for now.

You only posted the jar…

Originally I couldn't find how to post the .jar properly, but I sorted that so people didn't need a compiler, but if you want to see the code, here it is:

package learn;

/**
 *
 * @author Richard
 */
public class CelsiusConverter extends javax.swing.JFrame {

    public CelsiusConverter() {
        initComponents();
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        tempTextField = new javax.swing.JTextField();
        celsiusLabel = new javax.swing.JLabel();
        convertButton = new javax.swing.JButton();
        fahrenheitLabel = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Celsius Converter");

        tempTextField.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                tempTextFieldActionPerformed(evt);
            }
        });

        celsiusLabel.setText("Celsius");

        convertButton.setText("Convert");
        convertButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                convertButtonActionPerformed(evt);
            }
        });

        fahrenheitLabel.setText("Fahrenheit");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(tempTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(celsiusLabel))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(convertButton)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(fahrenheitLabel)))
                .addContainerGap(26, Short.MAX_VALUE))
        );

        layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {convertButton, tempTextField});

        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(tempTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(celsiusLabel))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(convertButton)
                    .addComponent(fahrenheitLabel))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void tempTextFieldActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_tempTextFieldActionPerformed

}//GEN-LAST:event_tempTextFieldActionPerformed

    private void convertButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_convertButtonActionPerformed
        int tempFahr = (int)((Double.parseDouble(tempTextField.getText()))
            * 1.8 + 32);
    fahrenheitLabel.setText(tempFahr + " Fahrenheit");
    }//GEN-LAST:event_convertButtonActionPerformed

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

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JLabel celsiusLabel;
    private javax.swing.JButton convertButton;
    private javax.swing.JLabel fahrenheitLabel;
    private javax.swing.JTextField tempTextField;
    // End of variables declaration//GEN-END:variables

}

Not very good I know, my first use of GUI, I'm very new to this, and I get lazy and don't learn much for a while :p

Since u said you're new to Java; what did you used to learn it?
Cause i'm also interested in learning Java…

Take a class, look at the official Java tutorials, start reading the Javadocs, read other tutorials on Google, etc. There's a variety of ways you can learn Java, just go ahead and pick one. :)

It looks like you've use a GUI builder in an IDE to make the interface. This is Ok at the beginning however I would encourage you to learn how to code a GUI yourself.

The code will be much more readable, and much more reusable (Reusability being an important concept in programming) and you will learn a lot more about what is going on.

Haha, a converter hmm.. One of the many 'pointless' things you can do with Java. Well done ;)

From: Clishem
Haha, a converter hmm.. One of the many 'pointless' things you can do with Java. Well done ;)

You can create this 'pointless' thing in almost any language.