测试泛型

package collection;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**

• 测试泛型
• @author ly

*/
public class TestGeneric {
public static void main(String[] args) {

	MyCollection<String> mc = new MyCollection<>();//MyCollection<String>(); 后面可以空着
	mc.set("aaaa", 0);

// mc.set(8888, 1);

	String b = mc.get(0);

// Integer a = (Integer)mc.get(1);

	System.out.println(b);

}

}

class MyCollection{
Object[] objs = new Object[5];

public void set(E e,int index){
	objs[index] = e; 
}

public E get(int index){
	return (E)objs[index];
}

}