package gout;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class four {
public static void main(String[] args) {
new Myframe();
}
}
class Myframe extends frame{
public Myframe(){
TextField textField=new TextField();
add(textField);
// 添加事件监听
MyAction myAction = new MyAction();
textField.addActionListener(myAction);
// 设置替换编码 输入任何都转化为* 但输出文本
textField.setEchoChar('*');
setVisible(true);
pack();
}
}
class MyAction implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
TextField field=(TextField) e.getSource(); //获得资源
System.out.println(field.getText());
field.setText("");
}
}
简易计算器：
oop原则：组合大于继承
