java.awt.font 字体库 java font 字体类型

（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：