java 用可获取的字体、样式、字号修饰文字

（1）函数说明： 
字形类Font用于规范组件所使用的字形大小、样式和字体等。其构造函数： 
public Font(String name,int style,int size); 
name表示本地可获取字体名称 
style表示字体样式，包含Font.PLAIN，Font.BOLD，Font.ITALIC三种，分别对应平体、加粗和斜体。 

一个有用的方法用来获取本地可用字体 
GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment(); 
String[] fa=ge.getAvailableFontFamilyNames(); 

通过从绘图环境中获取到本地可用的字体名数组。 

（2）代码  用指定的字型约束来显示窗体上的字。

import java.awt.*;import java.awt.event.*;import javax.swing.*; public class GraExp extends JFrame{ CInstead c1=new CInstead();Container c;String[] zt;String[] zx={ "平体" ,"加粗" ,"斜体" } ; String name="Serif" ;int type=0;int size=12; JLabel lbl1=new JLabel("字体：" );JLabel lbl2=new JLabel("字形：" );JLabel lbl3=new JLabel("字号：" ); JLabel lbl=new JLabel("测试用字abcABC123" );JComboBox cb1,cb2=new JComboBox(zx);JTextField tf1=new JTextField(25),tf2=new JTextField(10); public GraExp(){ //获取可用字体名称数组 GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();zt=ge.getAvailableFontFamilyNames();cb1=new JComboBox(zt);setContentPane(c1);c=getContentPane();c.setLayout(new FlowLayout(FlowLayout.LEFT));c.add(lbl1);c.add(cb1);c.add(lbl2);c.add(cb2);c.add(lbl3);c.add(tf1);lbl.setPreferredSize(new Dimension(200,60));lbl.setForeground(Color.red);c.add(lbl); cb1.addItemListener(new ItemListener(){ public void itemStateChanged(ItemEvent event){ int state=event.getStateChange();name=(String) event.getItem();setCustomFont(name,type,size);} } );cb2.addItemListener(new ItemListener(){ public void itemStateChanged(ItemEvent event){ int state=event.getStateChange();String s=(String) event.getItem();if (s.equals("平体" )){ type=Font.PLAIN;} else if (s.equals("加粗" )){ type=Font.BOLD;} else { type=Font.ITALIC;} setCustomFont(name,type,size);} } );tf1.addKeyListener(new KeyAdapter(){ public void keyPressed(KeyEvent e) { int c=e.getKeyCode();if (c==10){ String s=tf1.getText();size=Integer.parseInt(s);setCustomFont(name,type,size);} } } ); setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);setSize(new Dimension(400,300));show();} public static void main(String[] args){ GraExp ge=new GraExp();}  private void setCustomFont(String name,int type,int size){ lbl.setFont(new Font(name,type,size));lbl.revalidate();} class CInstead extends JPanel{ ImageIcon icon;Image img;public CInstead(){ icon=new ImageIcon(CInstead.class.getResource("333.png" ));img=icon.getImage();} public void paintComponent(Graphics g){ super.paintComponent(g);g.drawImage(img,0,0,null );} } } 

程序效果：