Java实训——编写一个窗体程序，能够对文本区中的文字设置字体和大小。

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实训要求：编写一个窗体程序，能够对文本区中的文字设置字体和大小。

代码:

import java.awt.*;import java.awt.event.*;import javax.swing.*;public class FontChange extends JFrame implements ItemListener {JComboBox fontName;JComboBox fontSize;JTextArea txtContent;Font font;final String[] fontArr;final String strArr="老毕老王是影帝，\n"+"老马不服其演技。\n"+"没日没夜秀才艺，\n"        +"不知王毕已胜利。\n";final String[] sizeArr={"8","9","10","12","14","16","18","20","24","28","32","36","40","44","48","54","60","66","72","80","88","1000"};public FontChange(){super("改变字体");txtContent=new JTextArea();txtContent.setText(strArr);JScrollPane jsp=new JScrollPane(txtContent);GraphicsEnvironment env=GraphicsEnvironment.getLocalGraphicsEnvironment();fontArr=env.getAvailableFontFamilyNames();fontName=new JComboBox(fontArr);fontSize=new JComboBox(sizeArr);fontSize.setPreferredSize(new Dimension(80,27));fontName.addItemListener(this);fontSize.addItemListener(this);fontName.setSelectedItem("宋体");fontSize.setSelectedItem("16");FlowLayout layout=new FlowLayout(FlowLayout.CENTER,40,5);JPanel pan=new JPanel(layout);pan.add(fontName);pan.add(fontSize);Container c=this.getContentPane();c.add(pan, BorderLayout.NORTH);    c.add(jsp,BorderLayout.CENTER);    this.setSize(1900,1000);    this.setResizable(false);    this.setVisible(true);    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}public void itemStateChanged(ItemEvent e){String s=(String)fontName.getSelectedItem();int n=Integer.parseInt((String)fontSize.getSelectedItem());font=new Font(s,Font.PLAIN,n);txtContent.setFont(font);}public static void main(String[] args) {// TODO Auto-generated method stubnew FontChange();}}

运行：

小结：终于是接触到图形用户界面了，这些东西不难但是很繁杂，要多敲，多练才能掌握。

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