2019.11.14

动作事件
1、P255例13.22，以及P256例13.23，注意比较用 普通当前类和匿名内部类两种方式实现按钮对象的事件监听器。（必做题，20分）

代码1：
package MyAdvancedEvent;

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

import MyAdvancedEvent.SimpleEvent.jbAction;

public class SimpleEvents extends JFrame implements ActionListener{
	private JButton jb=new JButton("我是按钮，单击我");
	public SimpleEvents() {
		setLayout(null);
		setBounds(100,100,300,300);
		setVisible(true);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		add(jb);
		jb.setBounds(10, 10, 150, 30);
		jb.addActionListener(this);
	}
	public void actionPerformed(ActionEvent e) {
		jb.setText("我被单击了");
	}
	public static void main(String[] args) {
		new SimpleEvents();
	}
}
代码2：
package MyAdvancedEvent;

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

import MyAdvancedEvent.SimpleEvent.jbAction;

public class SimpleEvent2 extends JFrame{
	private JButton jb=new JButton("我是按钮，单击我");
	public SimpleEvent2() {
		setLayout(null);
		setBounds(100,100,300,300);
		setVisible(true);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		add(jb);
		jb.setBounds(10, 10, 150, 30);
		jb.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				jb.setText("我被单击了");
			}
		});
	}
	public static void main(String[] args) {
		new SimpleEvent2();
	}
}

运行截图:

鼠标事件
1、P460【例25.2】一个用来演示鼠标事件的典型示例MouseEvent_Example（必做题，20分）

代码：
package MyAdvancedEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.*;
public class MouseEvent1 {
	JFrame f;
	JLabel l;
	public MouseEvent1() {
		f=new JFrame();
		l=new JLabel();
		f.add(l);
		l.addMouseListener(new MouseListener() {
			public void mouseClicked(MouseEvent e) {
				System.out.print("单击了鼠标按键，");
				int i=e.getButton();
				if(i==MouseEvent.BUTTON1) {
					System.out.println("单击的是鼠标左键，");
				}
				if(i==MouseEvent.BUTTON2) {
					System.out.println("单击的是鼠标滚轮，");
				}
				if(i==MouseEvent.BUTTON3) {
					System.out.println("单击的是鼠标右键键，");
				}
				int clickcount=e.getClickCount();
				System.out.println("单击次数为"+clickcount+"下");
			}
			public void mousePressed(MouseEvent e) {
				System.out.print("鼠标按键被按下，");
				int i=e.getButton();
				if(i==MouseEvent.BUTTON1) {
					System.out.println("按下的是鼠标左键，");
				}
				if(i==MouseEvent.BUTTON2) {
					System.out.println("按下的是鼠标滚轮，");
				}
				if(i==MouseEvent.BUTTON3) {
					System.out.println("按下的是鼠标右键键，");
				}
			}
			public void mouseReleased(MouseEvent e) {
				System.out.print("鼠标按键被释放，");
				int i=e.getButton();
				if(i==MouseEvent.BUTTON1) {
					System.out.println("释放的是鼠标左键，");
				}
				if(i==MouseEvent.BUTTON2) {
					System.out.println("释放的是鼠标滚轮，");
				}
				if(i==MouseEvent.BUTTON3) {
					System.out.println("释放的是鼠标右键键，");
				}
			}
			public void mouseEntered(MouseEvent e) {
				System.out.println("光标移入组件");
			}
			public void mouseExited(MouseEvent e) {
				System.out.println("光标移入组件");
			}
			
		});
		f.setBounds(100, 100, 200, 200);
		f.setVisible(true);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	public static void main(String[] args) {
		new MouseEvent1();
	}
}

运行截图：

2、鼠标选色卡MouseEventColor，运行结果如下，通过鼠标点击不同的颜色，将窗体的背景色设置成不同。试用普通类、匿名内部类、鼠标适配器三种方式分别实例化监听器对象。
（必做题，20分）

代码1：
package MyAdvancedEvent;
import java.awt.Color;
import java.awt.Font;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.*;
public class MouseEventColor implements MouseListener{
	JFrame f;
	JPanel p;
	Box box;
	JButton[]Button=new JButton[7];
	Color[]color= {Color.CYAN,Color.BLUE,Color.GRAY,Color.DARK_GRAY,Color.MAGENTA,Color.YELLOW,Color.PINK};
	public MouseEventColor() {
		f=new JFrame("选");
		p=new JPanel();
		box=Box.createHorizontalBox();
		for(int i=0;i<7;i++) {
			Button[i]=new JButton("  ");
			Button[i].setBackground(color[i]);
			Button[i].setFont(new Font("",Font.PLAIN,15));
			Button[i].addMouseListener(this);
			box.add(Button[i]);
		}
		p.add(box);
		f.add(p);
		f.setBounds(100, 100, 310, 300);
		f.setVisible(true);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	public static void main(String[] args) {
		new MouseEventColor();
	}
		public void mouseClicked(MouseEvent e) {
			if(e.getSource()==Button[0]) {
				p.setBackground(color[0]);
			}else if(e.getSource()==Button[1]) {
				p.setBackground(color[1]);
			}else if(e.getSource()==Button[2]) {
				p.setBackground(color[2]);
			}else if(e.getSource()==Button[3]) {
				p.setBackground(color[3]);
			}else if(e.getSource()==Button[4]) {
				p.setBackground(color[4]);
			}else if(e.getSource()==Button[5]) {
				p.setBackground(color[5]);
			}else{
				p.setBackground(color[6]);
			}
		}
		public void mousePressed(MouseEvent e) {
			
		}
		public void mouseReleased(MouseEvent e) {
			
		}
		public void mouseEntered(MouseEvent e) {
			
		}
		public void mouseExited(MouseEvent e) {
			
		}
	
}
代码2：
package MyAdvancedEvent;
import java.awt.Color;
import java.awt.Font;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.*;
public class MouseEventColor1 {
	JFrame f;
	JPanel p;
	Box box;
	JButton[]Button=new JButton[7];
	Color[]color= {Color.CYAN,Color.BLUE,Color.GRAY,Color.DARK_GRAY,Color.MAGENTA,Color.YELLOW,Color.PINK};
	public MouseEventColor1() {
		f=new JFrame("选");
		p=new JPanel();
		box=Box.createHorizontalBox();
		for(int i=0;i<7;i++) {
			Button[i]=new JButton("  ");
			Button[i].setBackground(color[i]);
			Button[i].setFont(new Font("",Font.PLAIN,15));
			Button[i].addMouseListener(new MouseListener() {
				public void mouseClicked(MouseEvent e) {
					if(e.getSource()==Button[0]) {
						p.setBackground(color[0]);
					}else if(e.getSource()==Button[1]) {
						p.setBackground(color[1]);
					}else if(e.getSource()==Button[2]) {
						p.setBackground(color[2]);
					}else if(e.getSource()==Button[3]) {
						p.setBackground(color[3]);
					}else if(e.getSource()==Button[4]) {
						p.setBackground(color[4]);
					}else if(e.getSource()==Button[5]) {
						p.setBackground(color[5]);
					}else{
						p.setBackground(color[6]);
					}
				}
				public void mousePressed(MouseEvent e) {
					
				}
				public void mouseReleased(MouseEvent e) {
					
				}
				public void mouseEntered(MouseEvent e) {
					
				}
				public void mouseExited(MouseEvent e) {
					
				}
			});
			box.add(Button[i]);
		}
		p.add(box);
		f.add(p);
		f.setBounds(100, 100, 310, 300);
		f.setVisible(true);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	public static void main(String[] args) {
		new MouseEventColor1();
	}
}
代码3：
package MyAdvancedEvent;
import java.awt.Color;
import java.awt.Font;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.*;
public class MouseEventColor3 {
	JFrame f;
	JPanel p;
	Box box;
	Color[]color= {Color.CYAN,Color.BLUE,Color.GRAY,Color.DARK_GRAY,Color.MAGENTA,Color.YELLOW,Color.PINK};
	public MouseEventColor3() {
		f=new JFrame("");
		p=new JPanel();
		box=Box.createHorizontalBox();
		for(int i=0;i<color.length;i++) {
			final JButton button=new JButton(" ");
			button.setBackground(color[i]);
			button.setFont(new Font("",Font.PLAIN,15));
			button.addMouseListener(new MouseAdapter() {
				public void mouseClicked(MouseEvent e) {
						p.setBackground(button.getBackground());
				}
			});
			box.add(button);
		}
		p.add(box);
		f.add(p);
		f.setBounds(100, 100, 310, 300);
		f.setVisible(true);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	public static void main(String[] args) {
		new MouseEventColor3();
	}
}

运行截图：

3、鼠标事件响应练习MouseEventapp.java。当鼠标进入窗口时，窗口的标题显示“欢迎”；当鼠标离开窗口时，窗口的标题显示“再见”；鼠标在窗体单击时，就在鼠标单击所在位置显示“开始”。（必做题，20分）

代码：
package MyAdvancedEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.*;
public class MouseEventapp {
	JFrame f;
	JLabel l;
	public MouseEventapp() {
		f=new JFrame("再见！");
		l=new JLabel("开始");
		f.add(l);
		l.setVisible(false);
		f.addMouseListener(new MouseAdapter() {
			public void mouseClicked(MouseEvent e) {
				l.setVisible(true);
				int x=e.getX(),y=e.getY()-30;
				l.setBounds(x, y, 100, 20);
			}
			public void mouseEntered(MouseEvent e) {
				f.setTitle("欢迎！");
			}
			public void mouseExited(MouseEvent e) {
				f.setTitle("再见！");
				l.setVisible(false);
			}
		});
		f.setBounds(200, 200, 300, 300);
		f.setVisible(true);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	public static void main(String[] args) {
		new MouseEventapp();
	}
}

运行截图：

2、鼠标移动监听练习MyMouseMotionListener.java。当鼠标在窗体内移动和拖动时，分别显示如下信息：最前面是移动或拖动次数；最后面的是发生事件时鼠标所在的x坐标和y坐标（选做题，20分）

代码：
package MyAdvancedEvent;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import javax.swing.*;

public class MyMouseMotionLister {
	JFrame f;
	JLabel l;
	JButton b;
	JTextArea ta;
	JScrollPane sp;
	int count;
	public MyMouseMotionLister() {
		f=new JFrame("MyMouseMotionLister");
		l=new JLabel("click and drag the mouse");
		b=new JButton("退出");
		ta=new JTextArea();
		sp=new JScrollPane(ta);
		sp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
		f.add(l,BorderLayout.NORTH);
		f.add(sp,BorderLayout.CENTER);
		f.add(b,BorderLayout.SOUTH);
		f.setSize(400, 300);
		f.setVisible(true);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		ta.addMouseMotionListener(new MouseMotionListener() {
			public void mouseDragged(MouseEvent e) {
				int xx=e.getX(),yy=e.getY();
				count++;
				String counts=count+"",x=xx+"",y=yy+"";
				String content=counts+"the mouse is drag:x="+x+",y="+y;
				ta.append(content+"\n");
			}
			public void mouseMoved(MouseEvent e) {
				int xx=e.getX(),yy=e.getY();
				count++;
				String counts=count+"",x=xx+"",y=yy+"";
				String content=counts+"the mouse is moving:x="+x+",y="+y;
				ta.append(content+"\n");
			}
		});
		b.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e){
				if(e.getSource()==b){
					System.exit(0);
				}
			}
		});
	}
	public static void main(String[] args){
		new MyMouseMotionLister();
	}
}

运行截图：