监听退出
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
super.windowClosing(e);
System.exit(0);
}
});
布局管理器
- 流式布局
- 东西南北中布局
- 网格布局
监听：当某个事件发生的时候干什么
public class gui {
public static void main(String[] args) {
Frame frame = new Frame("kafens");
Button but1 = new Button("click!");
frame.add(but1);
frame.setVisible(true);
myButtonListener my = new myButtonListener();
but1.addActionListener(my);
closeWindow(frame);
}
public static void closeWindow(Frame frame){
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
class myButtonListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("kafen");
}
}
监听的复用
public class gui {
public static void main(String[] args) {
Frame frame = new Frame();
Button but1 = new Button("start");
Button but2 = new Button("stop");
frame.add(but1,BorderLayout.NORTH);
frame.add(but2,BorderLayout.SOUTH);
but1.setActionCommand("but1");//可以设置标识符
but2.setActionCommand("but2");//可以设置标识符
myAction ma = new myAction();
but1.addActionListener(ma);
but2.addActionListener(ma);
frame.setVisible(true);
}
}
class myAction implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
if(e.getActionCommand().equals("but1")){
System.out.println("this is but1");
}
else{
System.out.println("this is but2");
}
}
}
文本框
public class gui {
public static void main(String[] args) {
myFrame mf = new myFrame();
}
}
class myFrame extends Frame{
public myFrame(){
TextField tf1 = new TextField();
add(tf1);
myActionListener ma = new myActionListener();
tf1.addActionListener(ma);
pack();
tf1.setEchoChar('*');
setVisible(true);
}
}
class myActionListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
TextField field = (TextField)e.getSource();//get some source,return a object
System.out.println(field.getText());; //get the text imformation
field.setText("");
}
}
//看到第八集