7、画笔Paint
public class TestPaint {
public static void main(String[] args) {
new MyPaint().loadFrame();
}
}
class MyPaint extends Frame{
public void loadFrame(){
setBounds(300,200,500,400);
setVisible(true);
}
@Override
public void paint(Graphics g) {
//画笔需要有颜色需要画图案
g.setColor(Color.blue);
g.drawOval(100,100,100,100);
g.setColor(Color.yellow);
g.fillRect(100,200,100,100);
}
}
8、鼠标监听
目的:实现鼠标画画!
//鼠标监听事件
public class TestMouseListener {
public static void main(String[] args) {
new MyFrame("画图");
}
}
//自己的类
class MyFrame extends Frame{
//画画需要画笔,需要鼠标监听当前的位置,需要集合来存储这些点
ArrayList points;
public MyFrame(String title){
super(title);
setBounds(200,200,400,300);
points = new ArrayList();
setVisible(true);
addMouseListener(new MyMouseListener());
}
@Override
public void paint(Graphics g) {
//画画 监听鼠标的事件
Iterator iterator = points.iterator();
while (iterator.hasNext()){
Point point = (Point)iterator.next();
g.setColor(Color.blue);
g.fillOval(point.x,point.y,10,10);
}
}
//添加一个点到界面上
public void addPoint(Point point){
points.add(point);
}
//适配器模式
private class MyMouseListener extends MouseAdapter {
//鼠标按下 弹起 按住不放
@Override
public void mousePressed(MouseEvent e) {
MyFrame frame = (MyFrame) e.getSource();
//当我们点击鼠标的时候就会产生一个点
frame.addPoint(new Point(e.getX(),e.getY()));
//每次点击鼠标都需要重新画一次
frame.repaint();//刷新
}
}
}
9、 窗口监听
public class TestWindow {
public static void main(String[] args) {
new WindowFrame();
}
}
class WindowFrame extends Frame{
public WindowFrame() {
setBackground(Color.blue);
setBounds(100,100,200,200);
setVisible(true);
this.addWindowListener(new WindowAdapter() {
//匿名内部类
@Override
public void windowClosing(WindowEvent e) {
System.out.println("windowClosing");
System.exit(0);
}
@Override
public void windowActivated(WindowEvent e) {
WindowFrame frame = (WindowFrame) e.getSource();
frame.setTitle("被激活了");
System.out.println("windowActivated");
}
});
}
}
10、键盘监听
//键盘监听
public class TestKeyListener {
public static void main(String[] args) {
new MyKeyFrame();
}
}
class MyKeyFrame extends Frame{
public MyKeyFrame(){
setBackground(Color.blue);
setBounds(100,100,200,200);
setVisible(true);
addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
int keyCode = e.getKeyCode();
System.out.println(keyCode);
if (keyCode == KeyEvent.VK_UP){
System.out.println("你按下了上键");
}
}
});
}
}