Java最难的语法＜泛型＞

public static void main(String[] args) {
         int a = 10;
         Integer aa = a; //装箱
         Integer b = 20;
         int bb = b;     //拆箱  
     }

int a = 10;
Integer aa = Integer.valueOf(a); //装箱
Integer b = new Integer(20);
int bb = b.intValue();     //拆箱

class MyArray<T> {
    public T[]array = (T[]) new Object[10];
    public void setval(int pos,T val){
        array[pos] = val;
    }
    public T getval(int pos){
        return array[pos];
    }
}
public class Main {
    public static void main(String[] args) {
         MyArray<String> myArray = new MyArray<String>();
         myArray.setval(1,"hello");
         myArray.setval(2,"bit");
         String str = myArray.getval(1);
         System.out.println(str);
         MyArray<Integer> myArray1 = new MyArray<>();
         myArray1.setval(0,1);
         int val = myArray1.getval(0);
        System.out.println(val);
    }
}

MyArray<Integer> list = new MyArray<Integer>()；