java_Swing桌面程序开发

1.按钮动作事件

单击按钮时触发动作事件，ActionEvent(动作事件）
需要为按钮添加事件监听器——编写动作事件监听器通过实现 ActionListener监听接口来完成。
ActionListener中只需要实现actionPerformed方法，将触发时间后要执行的程序都写在actionPerformed中。

import javax.swing.*;
import java.awt.event.*;

public class Swing1 extends JFrame
{
	int i=0;
	JPanel jp=new JPanel();
	JButton jb= new JButton("按钮");
	public Swing1()
	{
		this.setTitle("创建面板");
		jp.add(jb);
		jb.setMnemonic('F');
		jb.addActionListener(new ActionListener()
				{
					public void actionPerformed(ActionEvent e)
					{
						Swing1.this.jb.setText("次数："+(++i));
					}
			
				}
				
				);
		this.add(jp);
		this.setBounds(300,250,500,200);
		this.setVisible(true);
	}
	public static void main(String[] args)
	{
		Swing1 s1=new Swing1();
		
	}
}

运行结果：

2.1. 同一个事件注册多个监听器

import javax.swing.*;
import java.awt.event.*;

public class Swing1 extends JFrame
{
	int i=0;
	JPanel jp=new JPanel();
	JButton jb= new JButton("按钮");
	public Swing1()
	{
		this.setTitle("创建面板");
		jp.add(jb);
		jb.setMnemonic('F');
		jb.addActionListener(new ActionListener()
				{
					public void actionPerformed(ActionEvent e)
					{
						Swing1.this.jb.setText("次数1："+(++i));
					}
			
				}
				
				);
		jb.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				Swing1.this.jb.setText("次数2："+(++i));
			}
	
		}
		
		);
		this.add(jp);
		this.setBounds(300,250,500,200);
		this.setVisible(true);
	}
	public static void main(String[] args)
	{
		Swing1 s1=new Swing1();
		
	}
}

运行结果：

2.2. 同一个监听器注册给多个事件源

import javax.swing.*;
import java.awt.event.*;

public class Swing2 extends JFrame implements ActionListener
{
	int i=0;
	int j=0;
	JPanel jp=new JPanel();
	JButton jb1= new JButton("按钮1");
	JButton jb2= new JButton("按钮2");
	public Swing2()
	{
		this.setTitle("创建面板");
		
		jp.add(jb1);
		jp.add(jb2);
		
		jb1.setMnemonic('N');
		jb2.setMnemonic('F');
		
		jb1.addActionListener(this);
		jb2.addActionListener(this);
		
		this.add(jp);
		this.setBounds(300,250,500,200);
		this.setVisible(true);
	}
	
	public void actionPerformed(ActionEvent e)
	{
		if(e.getSource()==jb2)
		{
			Swing2.this.jb2.setText("按钮2次数："+(++j));
		}
		else if(e.getSource()==jb1)
		{
			Swing2.this.jb1.setText("按钮1次数："+(++i));
		}
	}

	public static void main(String[] args)
	{
		Swing2 s1=new Swing2();
		
	}
}

3. 窗体获取和失去焦点事件

通过WindowFocusListener 监听接口实现

import javax.swing.*;
import java.awt.event.*;

public class Swing2 extends JFrame implements WindowFocusListener
{
	int i=0;
	int j=0;
	JPanel jp=new JPanel();
	JButton jb1= new JButton("按钮1");
	
	public Swing2()
	{
		this.setTitle("创建面板");
		this.addWindowFocusListener(this); //注册窗体获取和失去焦点事件
		this.setBounds(300,250,500,200);
		this.setVisible(true);
		
		jp.add(jb1);
		jb1.setMnemonic('N');
		this.add(jp);
	}
	public void windowGainedFocus(WindowEvent e)
	{
		System.out.println("窗体获取焦点");
	}
	
	public void windowLostFocus(WindowEvent e)
	{
		System.out.println("窗体失去焦点");
	}

	public static void main(String[] args)
	{
		Swing2 s1=new Swing2();
	}
}

4. 窗体打开、关闭和**事件

WindowListener接口

import javax.swing.*;
import java.awt.event.*;

public class Swing2 extends JFrame implements WindowListener
{
	int i=0;
	int j=0;
	JPanel jp=new JPanel();
	JButton jb1= new JButton("按钮1");
	
	public Swing2()
	{
		this.setTitle("创建面板");
		
		this.setBounds(300,250,500,200);
		this.setVisible(true);
		this.addWindowListener(this);
		
		
		jp.add(jb1);
		jb1.setMnemonic('N');
		this.add(jp);
	}
	public void windowOpened(WindowEvent e)
	{
		System.out.println("窗体首次变为可见");
	}

	public void windowClosing(WindowEvent e)
	{
		System.out.println("关闭窗体");
	}
	public void windowClosed(WindowEvent e)
	{
		System.out.println("关闭窗体后");
	}
	
	public void windowIconified(WindowEvent e)
	{
		System.out.println("从正常状态变为最小化状态");
	}
	
	public void windowDeiconified(WindowEvent e)
	{
		System.out.println("从最小化状态变为正常状态");
	}
	public void windowActivated(WindowEvent e)
	{
		System.out.println("窗体被**");
	}
	public void windowDeactivated(WindowEvent e)
	{
		System.out.println("窗体变为非**");
	}
	public static void main(String[] args)
	{
		Swing2 s1=new Swing2();
	}
}

运行结果：

窗体被**
窗体首次变为可见
从正常状态变为最小化状态
窗体变为非**
从最小化状态变为正常状态
窗体被**
关闭窗体
窗体变为非**

5. 密码框

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class KongJian extends JFrame implements ActionListener
{
	JTextField jtf=new JTextField(10);
	JPasswordField jpf =new JPasswordField(10);
	JLabel jl1=new JLabel("用户名：");
	JLabel jl2=new JLabel("密码：");
	JButton jb=new JButton("提交");
	JLabel j1=new JLabel();
	JPanel jp=new JPanel();
	public KongJian()
	{
		this.setTitle("创建文本框");
		jp.setLayout(null);
		jl1.setBounds(30,20,80,30);
		jp.add(jl1);
		jl2.setBounds(30,70,80,30);
		jp.add(jl2);
		
		jtf.setBounds(80,20,180,30);
		jp.add(jtf);
		
		jpf.setBounds(80,70,180,30);
		jp.add(jpf);
		
		jb.setBounds(50,130,80,30);
		jp.add(jb);
		
		j1.setBounds(10,180,300,30);
		jp.add(j1);
		
		jb.addActionListener(this);
		this.add(jp);
		
		this.setBounds(300,250,350,250);
		this.setVisible(true);

	}
	
	@SuppressWarnings("deprecation")
	public void actionPerformed(ActionEvent e)
	{
		String s1=jtf.getText();
		
		String s2=jpf.getText();
		j1.setText("你的用户名为："+s1+" 密码为："+s2);
	}
	public static void main(String[] args)
	{
		KongJian kj= new KongJian();
	}
}

6.多行文本框

import javax.swing.*;
//import java.*;
//import java.awt.event.*;


public class DuoHang extends JFrame
{
	JTextArea jta=new JTextArea(6,10);
	JLabel j1=new JLabel("多行文本框");
	JPanel jp=new JPanel();
	public DuoHang()
	{
		this.setTitle("创建文本框");
		jp.add(jta);
		jp.add(j1);
		this.add(jp);
		this.setBounds(300,250,300,200);
		this.setVisible(true);
	}
	public static void main(String[] args)
	{
		DuoHang dh=new DuoHang();
		
	}
}