fontsetdemo.java

学习参考,java基本语法练习,包括一些常用的技巧

//JCheckBox、JComboBox、JList和JRadioButton组件综合演示
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class FontSetDemo extends JFrame implements ActionListener,ItemListener,ListSelectionListener
{
	JPanel pnlMain;
	JLabel lblTest;
	JList lstSize;
	JRadioButton rbtnRed,rbtnGreen;
	JCheckBox chkBold,chkItalic;
	JButton btnExit;
	JComboBox cmbType;
	ButtonGroup grpColor;
	
	public FontSetDemo()
	{
		super("组件综合演示");
		lblTest=new JLabel("测试文字");
		grpColor=new ButtonGroup();
		rbtnRed=new JRadioButton("红色");
		grpColor.add(rbtnRed);
		rbtnRed.setSelected(true);
		rbtnRed.addItemListener(this);
		rbtnGreen=new JRadioButton("绿色");
		grpColor.add(rbtnGreen);
		rbtnGreen.addItemListener(this);
		chkBold=new JCheckBox("加粗");
		chkBold.addItemListener(this);
		chkItalic=new JCheckBox("倾钭");
		chkItalic.addItemListener(this);
		lstSize=new JList();
		lstSize.addListSelectionListener(this);
//		lstSize.addItemListener(this);
//		for (int i=10;i<30;i+=2)
//			lstSize.add(String.valueOf(i),lstSize);
		btnExit=new JButton("退出");
		btnExit.addActionListener(this);
	
		pnlMain=new JPanel();
		pnlMain.add(lblTest);
		pnlMain.add(rbtnRed);
		pnlMain.add(rbtnGreen);
		pnlMain.add(chkBold);
		pnlMain.add(chkItalic);
		pnlMain.add(lstSize);
		pnlMain.add(btnExit);
		
		this.setContentPane(pnlMain);
		setSize(400,300);
		setVisible(true);
	}
	 	public void valueChanged(ListSelectionEvent e) 
	 	{
	 		
	 	}
 
		public void actionPerformed(ActionEvent evt)
		{
			if (evt.getSource()==btnExit)
				System.exit(0);
		}
		public void itemStateChanged(ItemEvent evt)
		{
			if (evt.getSource()==rbtnRed)	
				lblTest.setForeground(Color.RED);
			if (evt.getSource()==rbtnGreen)
				lblTest.setForeground(Color.GREEN);
			int intBold=(chkBold.isSelected()?Font.BOLD:Font.PLAIN);
			int intItalic=(chkItalic.isSelected()?Font.ITALIC:Font.PLAIN);
			int intSize=Integer.parseInt((String)lstSize.getSelectedValue());
			lblTest.setFont(new Font("宋体",intBold+intItalic,intSize));
			
		}
	public static void main(String args[])
	{
		new FontSetDemo();
	}
}