一、事件监听
public class TestListener {public static void main(String[] args) {Frame frame = new Frame();Button button = new Button("buttom");ActionListener actionListener = new MyActionListener();button.addActionListener(actionListener);frame.add(button);frame.setSize(500,500);frame.setVisible(true);WindowC(frame);}//把关闭窗口抽象成一个方法public static void WindowC(Frame frame){frame.addWindowListener(new WindowAdapter() {@Overridepublic void windowClosing(WindowEvent e) {System.exit(0);}});}}class MyActionListener implements ActionListener{@Overridepublic void actionPerformed(ActionEvent e) {System.out.println("触发了button");}}
两个按钮、共享同一个事件
二、TextField事件监听
（frame.pack():会自适应）
public class TestTextField {public static void main(String[] args) {testFramex testFrame1 = new testFramex();}}class testFramex extends Frame{public testFramex(){TextField textField = new TextField();add(textField);textFiledActionListener textFiledActionListener = new textFiledActionListener();textField.addActionListener(textFiledActionListener);textField.setEchoChar('*');//隐藏输入setSize(500,500);setVisible(true);}}class textFiledActionListener implements ActionListener{@Overridepublic void actionPerformed(ActionEvent e) {TextField field = (TextField) e.getSource();System.out.println(field.getText());field.setText("");}}
三、回顾（组合+内部类）
class A extentd B{}class A{public B b; //组合B的全部方法属性}
多态和继承都会导致代码变负载，尽量用组合的方式。
