JAVA集合泛型，类型擦除，类型通配符上限之类的知识点-白红宇

感觉定义要比PYTHON严谨很多，一切源于静态语言的特点吧。。

于是语法上就复杂很多，值不值得呢？

参考测试URL：

http://www.cnblogs.com/lwbqqyumidi/p/3837629.html

import java.util.*;public class TestCollection {  public static void main(String args[]) {    List
     
       list = new ArrayList
      
       ();    list.add("QQYmydmidi");    list.add("corn");    //list.add(100);    for (int i=0; i < list.size(); i++) {      String name = (String) list.get(i);      System.out.println("name: " + name);    }    Box
       
         name = new Box
        
         ("coooorn");    Box
         
           age = new Box
          
           (712); Box
           
             number = new Box
            
             (314); System.out.println("name: " + name.getData()); System.out.println("age: " + age.getData()); System.out.println("name class: " + name.getClass()); System.out.println("age class: " + age.getClass()); System.out.println(name.getClass() == age.getClass()); getData(name); getData(age); getData(number); //getUpperNumberData(name); getUpperNumberData(age); getUpperNumberData(number); } public static void getData(Box
              data) { System.out.println("data: " + data.getData()); } public static void getUpperNumberData(Box
              data) { System.out.println("data: " + data.getData()); }}class Box
             
               { private T data; public Box(){}; public Box(T data) { this.data = data; } public T getData() { return data; }}