1 //define package
2 package com.kai.li;
3
4 //import packages and classes
5 import java.util.List;
6 import java.util.ArrayList;
7
8 //about collection
9 //joined in simple list
10 //client
11 public class Text2{
12 public static void main(String[] args){
13 System.out.println("Following is the first question.");
14 List<Outter> list=new ArrayList<Outter>();
15 Outter o1=new Outter();
16 Outter o2=new Outter();
17 Outter o3=new Outter();
18 list.add(o1);
19 list.add(o2);
20 list.add(o3);
21 System.out.println(list);
22 Outter[] ox=new Outter[list.size()];
23 ox=list.toArray(ox);
24 System.out.println(ox);
25 for(Outter lemp:list){
26 System.out.println(lemp);
27 }
28 Outter o4=list.get(0);
29 Outter o5=list.get(1);
30 Outter o6=list.get(2);
31 System.out.println(o4+" "+o5+" "+o6);
32 Outter.ShapePara<Integer,Double> s1=()->System.out.println("hi...hi...");
33 s1.toS();
34 try{
35
36 //A text of linked operate and implements by myself
37
38 s1.link1().link2().link3();
39
40 }catch(Exception e){
41 System.out.println("This a text about try catch.");
42 }
43 Outter.ShapePara<Integer,Double> s2=o4.new Circle<Integer,Double>(10,12.0,12.0);
44 System.out.println();
45 //following are the lambda and linked，so ,you can add,then div,then sub...... shortly,following equals new ChildrenName();
46 Outter.ShapePara<Integer,Double> s3=()->{};
47 s3.link1().link2().link3();
48 }
49 }
50
51 //interface and the class implenments it parts
52 //following is the first interface part
53 //Outter class
54 class Outter{
55 interface ShapePara<T1,T2>{
56 public void haha();
57 default public void toS(){
58 System.out.println("I am sorry,I can't implements the generic's operate.");
59 }
60 default public ShapePara<T1,T2> link1(){
61
62 toS();
63 System.out.println(this+":This is the first object operate.");
64 return this;
65 }
66 default public ShapePara<T1,T2> link2(){
67
68 toS();
69 System.out.println(this+":This is the second object operate.");
70 return this;
71 }
72 default public ShapePara<T1,T2> link3(){
73
74 toS();
75 System.out.println(this+":This is the third object operate.");
76 return this;
77 }
78 }
79 class Circle<T1,T2> implements ShapePara<T1,T2>{
80 public T1 radius;
81 private T2 x;
82 protected T2 y;
83 Circle(T1 radius){
84 this.radius=radius;
85 }
86 Circle(T1 radius,T2 x,T2 y){
87 this(radius);
88 this.x=x;
89 this.y=y;
90 }
91 public void setX(T2 x){
92 this.x=x;
93 }
94 public T2 getY(){
95 return y;
96 }
97 public T1 getRadius(){
98 return radius;
99 }
100 public void setRadius(T1 radius){
101 this.radius=radius;
102 }
103 public void setCenter(T2 x,T2 y){
104 this.setX(x);
105 this.y=y;
106 }
107 public void haha(){}
108 }
109 //I can't implements the operate of getArea and getCircumference with the generic
110 class Operate{
111 public double getArea(double radius){
112 return Math.PI*Math.pow(radius,2);
113 }
114 public double getCircumference(double radius){
115 return 2*Math.PI*radius;
116 }
117 }
118 }
