0922-----homework-part2---about simple collection and try catch and linked operate likes JQuery by self

//define package
package com.kai.li;
    
//import packages and classes
import java.util.List;
import java.util.ArrayList;
 
//about collection
//joined in simple list
//client
public class Text2{
    public static void main(String[] args){
        System.out.println("Following is the first question.");
        List<Outter> list=new ArrayList<Outter>();
        Outter o1=new Outter();
        Outter o2=new Outter();
        Outter o3=new Outter();
        list.add(o1);
        list.add(o2);
        list.add(o3);
        System.out.println(list);
        Outter[] ox=new Outter[list.size()];
        ox=list.toArray(ox);
        System.out.println(ox);
        for(Outter lemp:list){
            System.out.println(lemp);
        }
        Outter o4=list.get(0);
        Outter o5=list.get(1);
        Outter o6=list.get(2);
        System.out.println(o4+" "+o5+" "+o6);
        Outter.ShapePara<Integer,Double> s1=()->System.out.println("hi...hi...");
        s1.toS();
        try{

            //A text of linked operate and implements by myself

            s1.link1().link2().link3();    

        }catch(Exception e){
            System.out.println("This a text about try catch.");
        }
        Outter.ShapePara<Integer,Double> s2=o4.new Circle<Integer,Double>(10,12.0,12.0); 
        System.out.println();
        //following are the lambda and linked，so ,you can add,then div,then sub...... shortly,following equals new ChildrenName();
        Outter.ShapePara<Integer,Double> s3=()->{};
        s3.link1().link2().link3();
    }
}

//interface and the class implenments it parts
//following is the first interface part
//Outter class
class Outter{
    interface ShapePara<T1,T2>{
        public void haha();
        default public void toS(){
            System.out.println("I am sorry,I can't implements the generic's operate.");
        }
        default public ShapePara<T1,T2> link1(){
            
            toS();
            System.out.println(this+":This is the first object operate.");
            return this;
        }
        default public ShapePara<T1,T2> link2(){
            
            toS();
            System.out.println(this+":This is the second object operate.");
            return this;
        }
        default public ShapePara<T1,T2> link3(){
            
            toS();
            System.out.println(this+":This is the third object operate.");
            return this;
        }
    }
    class Circle<T1,T2> implements ShapePara<T1,T2>{
        public T1 radius;
        private T2 x;
        protected T2 y;
        Circle(T1 radius){
            this.radius=radius;
        }
        Circle(T1 radius,T2 x,T2 y){
            this(radius);
            this.x=x;
            this.y=y;
        }
        public void setX(T2 x){
            this.x=x;
        }
        public T2 getY(){
            return y;
        }
        public T1 getRadius(){
            return radius;
        }
        public void setRadius(T1 radius){
            this.radius=radius;
        }
        public void setCenter(T2 x,T2 y){
            this.setX(x);
            this.y=y;
        }
        public void haha(){}
    }
    //I can't implements the operate of getArea and getCircumference with the generic
    class Operate{
        public double getArea(double radius){
            return Math.PI*Math.pow(radius,2);
        }
        public double getCircumference(double radius){
            return 2*Math.PI*radius;
        }
    }    
}