Java图形化界面实例：

package ss;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import javax.swing.*;
public class ArtFont extends JFrame implements ActionListener,ItemListener{

JComboBox fontType;//字体样式下拉框,
JComboBox fontSize;//字体大小下拉框
JComboBox windowStyle;//窗体样式下拉框

JCheckBox boldBx;// 粗体按钮
JCheckBox italicBx;// 斜体按钮
JButton colorBtn;// 颜色按钮；
String[] fontNames;// 字体名称;
String[] fontSizes;// 字体大小；

JLabel label;// 输入提示标签；
JTextField inputText;// 文字输入框；
JTextArea txtArea;// 文字显示区;
JPanel northPanel;// 字体设置；
JPanel centerPanel;// 显示效果区
JPanel southPanel;//样式设置

Font font;
int boldStyle, italicStyle, underlineStyle;
int fontSizeStyle;
String fontNameStyle;
Color colorStyle = Color.black;// 设置字体的默认颜色为黑色;
String[] style = { "默认显示效果", "Windows显示效果", "Unix显示效果" };

public ArtFont() {
super("字体设置");
// 设置默认字体
boldStyle = 0;
italicStyle = 0;
underlineStyle = 0;
fontSizeStyle = 20;
fontNameStyle = "宋体";
font = new Font(fontNameStyle, boldStyle + italicStyle, fontSizeStyle);

northPanel = getNorthPanel();
centerPanel = getCenterPanel();
southPanel = getSouthPanel();
// 设置容器;
Container container = getContentPane();
container.setLayout(new BorderLayout());
container.add(northPanel, BorderLayout.NORTH);//将northPanel添加到窗体的北部
container.add(centerPanel, BorderLayout.CENTER);//将centerPanel添加到窗体的中部
container.add(southPanel, BorderLayout.SOUTH);//将southPanel添加到窗体的南部
setSize(500, 300);
setLocationRelativeTo(null);//将窗体位于屏幕的中央
setVisible(true); }
private JPanel getNorthPanel() {
JPanel panel = new JPanel();
label=new JLabel("输入",JLabel.LEFT);
panel.add(label);
inputText=new JTextField(10);
panel.add(inputText);
boldBx=new JCheckBox("粗体");
panel.add(boldBx);
italicBx=new JCheckBox("斜体");
panel.add(italicBx);
colorBtn=new JButton("颜色");
panel.add(colorBtn);
inputText.addActionListener(this);
colorBtn.addActionListener(this);
boldBx.addItemListener(this);
italicBx.addItemListener(this);
return panel;
}
private JPanel getCenterPanel() {
JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
txtArea=new JTextArea();
panel.add(txtArea, BorderLayout.CENTER);
return panel;
}
private JPanel getSouthPanel() {
JPanel panel = new JPanel();
GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();
fontNames=ge.getAvailableFontFamilyNames();
fontType=new JComboBox(fontNames);
fontType.setEditable(false);
fontType.setMaximumRowCount(10);



fontSizes=new String[63];
for(int i=0;i<63;i++){
fontSizes[i]=Integer.toString((i+10));
}
fontSize=new JComboBox(fontSizes);
fontSize.setEditable(false);
fontSize.setMaximumRowCount(10);
panel.add(fontSize);
fontType.addItemListener(this);
windowStyle=new JComboBox(style);
panel.add(fontType);
windowStyle.addItemListener(this);
panel.add(windowStyle);
return panel;
}
public static void main(String args[]) {
ArtFont artFont = new ArtFont();
artFont.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
@Override
public void itemStateChanged(ItemEvent e) {
// TODO Auto-generated method stub
if(e.getSource()==boldBx){
if(e.getStateChange()==ItemEvent.SELECTED){
boldStyle=1;
}else{
boldStyle=0;
}
}else if(e.getSource()==italicBx){
if(e.getStateChange()==ItemEvent.SELECTED){
italicStyle=1;
}else{
italicStyle=0;
}

}else if(e.getSource()==fontType){
fontNameStyle=(String)e.getItem();
}else if(e.getSource() == windowStyle){
String s = (String) e.getItem();
String className = "";
if (s.equals("Windows显示效果"))
className = "com.sun.java.swing.plaf.windows.WindowsLookAndFeel";
else if (s.equals("Unix显示效果"))
className = "com.sun.java.swing.plaf.motif.MotifLookAndFeel";
else if (s.equals("默认显示效果"))
className = UIManager.getCrossPlatformLookAndFeelClassName();
try {
UIManager.setLookAndFeel(className);
SwingUtilities.updateComponentTreeUI(this);
} catch (Exception de) {
System.out.println("Exception happened!");

}

}
font=new Font(fontNameStyle,boldStyle+italicStyle,fontSizeStyle);
txtArea.setFont(font);

}

@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == inputText){
txtArea.setText(inputText.getText());

}else if (e.getSource()==colorBtn){
colorStyle=JColorChooser.showDialog(this, "请选择一种颜色", colorStyle);
colorBtn.setForeground(colorStyle);
txtArea.setForeground(colorStyle);
}
}

}