font size and style

[oghenekaro EFEKODO]

hi,
pls,i'am a beginner in java and have being trying to write a code to (1).change the font size of a text.(2). change the font style of a text.(3)use dialog boxes effectively but failed.pls i need to tell me how to go about it and if you can help me with the code

[Joel McNary]

You can use the setFont() method of a component. You can get more information in our Swing forum, so I'm transferring this thread to that forum.

[Craig Wood]

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class FontChanges implements ActionListener
{
    Font hiFont, loFont;
    JTextField hiField, loField;
 
    public FontChanges()
    {
        hiFont = new Font("dialog", Font.PLAIN, 18);
        // lucida fonts found in your sdk src folder: jre/lib/fonts/
        loFont = new Font("lucida bright regular", Font.PLAIN, 18);
    }
 
    public void actionPerformed(ActionEvent e)
    {
        JButton button = (JButton)e.getSource();
        String ac = button.getActionCommand();
        if(ac.equals("style"))
            changeStyle();
        if(ac.equals("size"))
            changeSize();
    }
 
    private void changeStyle()
    {
        Object[] selectionValues = { "Plain", "Italic", "Bold" };
        Object o = JOptionPane.showInputDialog(null,
                                               "select a font style",
                                               "font style dialog",
                                               JOptionPane.QUESTION_MESSAGE,
                                               null,
                                               selectionValues,
                                               selectionValues[0]);
        String s = (String)o;
        int style;
        if(s.equals(selectionValues[0]))
            style = Font.PLAIN;              // 0
        else if(s.equals(selectionValues[1]))
            style = Font.ITALIC;             // 2
        else
            style = Font.BOLD;               // 1
        hiField.setFont(hiFont.deriveFont(style));
    }
 
    private void changeSize()
    {
        Object[] selectionValues = {
            new Float(14), new Float(16), new Float(18),
            new Float(20), new Float(22)
        };
        Object o = JOptionPane.showInputDialog(null,
                                               "select a font style",
                                               "font style dialog",
                                               JOptionPane.QUESTION_MESSAGE,
                                               null,
                                               selectionValues,
                                               selectionValues[2]);
        Float size = (Float)o;
        loField.setFont(loFont.deriveFont(size));
    }
 
    private JPanel getStylePanel()
    {
        hiField = new JTextField("hello world", 12);
        hiField.setFont(hiFont);
        JButton button = new JButton("change style");
        button.setActionCommand("style");
        button.addActionListener(this);
        JPanel panel = new JPanel();
        panel.add(hiField);
        panel.add(button);
        return panel;
    }
 
    private JPanel getSizePanel()
    {
        loField = new JTextField("hello world", 12);
        loField.setFont(loFont);
        JButton button = new JButton("change size");
        button.setActionCommand("size");
        button.addActionListener(this);
        JPanel panel = new JPanel();
        panel.add(loField);
        panel.add(button);
        return panel;
    }
 
    public static void main(String[] args)
    {
        FontChanges test = new FontChanges();
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(test.getStylePanel(), "North");
        f.getContentPane().add(test.getSizePanel(),  "South");
        f.setSize(360,200);
        f.setLocation(200,200);
        f.setVisible(true);
    }
}