Java泛型的一段代码

package com.chase.test;

import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;

public class testT {

public static <T> void main(String[] args) {
testT classT = new testT();
List<T> find = classT.find(0, 10);
if (find != null && find.size()>0) {
for (T integer : find) {
System.out.println(integer);
}
}
//        showList();
}

public static <T> void showList() {
testT classT = new testT();
List<T> find = classT.find(0, 10);
for (T t : find) {
System.out.println(t);
}
}

public <T> List<T> find(int begin, int end) {
List<T> list = new ArrayList<T>();
list.add((T)new Integer(222));
list.add((T)"111");
list.add((T)"昨天是重阳节！");
return list;
}
}

class TestGen0<K,V>{
public Hashtable<K,V> h=new Hashtable<K,V>();
public void put(K k, V v) {
h.put(k,v);
}
public V get(K k) {
return h.get(k);
}
public static void main(String args[]){
TestGen0<String,String> t=new TestGen0<String,String>();
t.put("key", "value");
String s=t.get("key");
System.out.println(s);
}
}