Java Basic(69)-Drop Down List Program

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Gui extends JFrame{

private JComboBox box;

private JLabel picture;

private static String[] filename = {"b.png", "g.png"};

private Icon[] pics = {new ImageIcon(getClass().getResource(filename[0])),new ImageIcon(getClass().getResource(filename[1]))};

public Gui(){

super("the title");

setLayout(new FlowLayout());

box = new JComboBox(filename);

box.addItemListener(

new ItemListener(){

public void itemStateChanged(ItemEvent event){

if(event.getStateChange()==ItemEvent.SELECTED)

picture.setIcon(pics[box.getSelectedIndex()]);

}

}

);

add(box);

picture=new JLabel(pics[0]);

add(picture);

}

}

Java Basic(68)-JcomboBox

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Gui extends JFrame{

private JComboBox box;

private JLabel picture;

private static String[] filename = {"b.png", "g.bng"}; →你的照片陣列

private Icon[] pics = {new ImageIcon(getClass().getResource(filename[0])),new ImageIcon(getClass().getResource(filename[1]))};

public Gui(){

super("the title");

setLayout(new FlowLayout());

box = new JComboBox(filename);

}

}

Java Basic(67)-JRadioButton Final Program

Continue...

//等待事件要發生

pb.addItemListener(new HandlerClass(pf));

bb.addItemListener(new HandlerClass(bf));

ib.addItemListener(new HandlerClass(itf));

bib.addItemListener(new HandlerClass(bif));

}

private class HandlerClass implements ItemListener{

private Font font;

public HandlerClass(Font f){

font = f;

}

public void itemStateChanged(ItemEvent event){

tf.setFont(font);

}

}

}

Java Basic(66)-JradioButton

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Gui extends JFrame{

private JTextField tf;

private Font pf;

private Font bf;

private Font itf;

private Font bif;

private JRadioButton pb;

private JRadioButton bb;

private JRadioButton ib;

private JRadioButton bib;

private ButtonGroup group;

public Gui(){

super("the title");

setLayout(new FlowLayout());

tf = new JTextField("Bucky is awesome", 25);

add(tf);

pb = new JRadioButton("plain", true);

bb = new JRadioButton("bold", false);

ib = new JRadioButton("italic", false);

bib = new JRadioButton("bold and italic", false);

add(pb);

add(bb);

add(ib);

add(bib);

group = new ButtonGroup();

group.add(pb);

group.add(bb);

group.add(ib);

group.add(bib);

pf = new Font("Serif", Font.PLAIN, 14);

bf = new Font("Serif", Font.BOLD, 14);

itf = new Font("Serif", Font.ITALIC, 14);

bif = new Font("Serif", Font.BOLD + Font.ITALIC, 14);

}

}

Java Basic(65)-The Final Check Box Program

Continue Java Basic(64)

private class HandlerClass implements ItemListener{

public void itemStateChanged(ItemEvent event){

Font font = null;

if(boldbox.isSelected() && italicbox.isSelected())

font = new Font("Serif", Font.BOLD + Font.ITALIC, 14);

else if(boldbox.isSelected())

font = new Font("Serif", Font.BOLD, 14);

else if(italicbox.isSelected())

font = new Font("Serif", Font.ITALIC, 14);

else

font = new Font("Serif", Font.PLAIN, 14);

tf.setFont(font);

}

}

The apples.java is same:

import javax.swing.JFrame;

class apples{

public static void main(String[] args){

Gui go = new Gui();

go.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

go.setSize(400, 200);

go.setVisible(true);

}

}

然後運行，你可以在checkbox，並改變字體為粗體和斜體