实验四 Java图形界面与事件处理(头歌)

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代码如下：

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;/*** Created by IntelliJ IDEA.** @Author :* @create: 2023/03/29 10:15*/
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 = 10;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());//将northPanel添加到窗体的北部container.add(northPanel, BorderLayout.NORTH);//将centerPanel添加到窗体的中部container.add(centerPanel, BorderLayout.CENTER);//将southPanel添加到窗体的南部container.add(southPanel, BorderLayout.SOUTH);setSize(500, 300);//将窗体位于屏幕的中央this.setLocationRelativeTo(null);setVisible(true);}private JPanel getNorthPanel() {JPanel panel = new JPanel();label = new JLabel("输入");inputText = new JTextField(10);boldBx = new JCheckBox("粗体");italicBx = new JCheckBox("斜体");colorBtn = new JButton("颜色");panel.add(label);panel.add(inputText);panel.add(boldBx);panel.add(italicBx);panel.add(colorBtn);/***  在下面括号中改名字JTextArea("计xxxx xxxxxxxx xx")***/JTextArea textArea=	new JTextArea("计xxxx xxxxxxxx xx");//注册事件监视器inputText.addActionListener(this);colorBtn.addActionListener(this);boldBx.addItemListener(this);italicBx.addItemListener(this);panel.add(textArea);return panel;}private JPanel getCenterPanel() {JPanel panel = new JPanel();txtArea =  new JTextArea();panel.setLayout(new BorderLayout());panel.add(new JScrollPane(txtArea), BorderLayout.CENTER);return panel;}private JPanel getSouthPanel() {JPanel panel = new JPanel();//获得系统默认字体GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();fontNames = ge.getAvailableFontFamilyNames();fontType = new JComboBox(fontNames);//设置字体大小fontSizes = new String[63];for (int i = 0; i < fontSizes.length; i++) {fontSizes[i] = Integer.toString(i+10);}fontSize = new JComboBox(fontSizes);windowStyle = new JComboBox(style);panel.add(fontType);panel.add(fontSize);panel.add(windowStyle);//注册事件监视器fontType.addItemListener(this);fontSize.addItemListener(this);windowStyle.addItemListener(this);return panel;}public static void main(String args[]) {ArtFont artFont = new ArtFont();artFont.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}@Overridepublic 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);}}@Overridepublic void itemStateChanged(ItemEvent e) {if (e.getSource() == boldBx) {if (boldBx.isSelected()){boldStyle=Font.BOLD;}else {boldStyle=Font.PLAIN;}} else if (e.getSource() == italicBx) {if (italicBx.isSelected()){italicStyle=Font.ITALIC;}else {italicStyle=Font.PLAIN;}} else if (e.getSource() == fontType) {fontNameStyle=(String) e.getItem();} else if (e.getSource() == fontSize) {fontSizeStyle=Integer.parseInt((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);}}