内部类

package singleModel;
import java.awt.Button;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class OuterClass {
    public static void main(String[] args) {
    }
    //1.对同包下的其他类隐藏
    //2.可以访问内部类定义作用域的属性，包括所有属性
    //3.匿名内部类回调函数，简化代码

    
/*    class innerClass{
        //外部内访问属性
//        private String field="field";
        public String field="field";
    }*/
    

    /*    private String outer = "outer";
    class InnerClass{
        public void test(){
            System.out.println("test");
            String s =  OuterClass.this.outer;
        }
    }*/

    
    //匿名内部类，不需要命名，直接声明一个对象到参数
/*    private Button button = null;
    public OuterClass(){
        button  = new Button();
        //参数new对象，不用声明，匿名
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                System.out.println( e.getActionCommand() );
            }
        });
    }
    
    private ActionListener actionListener = new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            System.out.println( e.getActionCommand() );
        }
    };*/
}