Java基础知识 泛型数组列表无类型参数

package arrayList;

import abstractClasses.Employee;

import java.util.ArrayList;

public class Test {
    public static void main(String[] args) {
         var staff = new ArrayList<>();//没有声明类型参数的泛型类

         staff.add(new Employee("111",2,2,2,2));

         Employee e = (Employee) staff.get(0);

         System.out.println("staff="+staff);
         System.out.println("e="+e);//staff强制转化后和e引用同一个类型

         System.out.println(staff.get(0));

         staff.set(0,4);
         System.out.println(staff.get(0));
         //没有声明的参数泛型类可以自动识别该类型，
    }
}
输出
：
staff=[abstractClasses.Employee@3d075dc0]
e=abstractClasses.Employee@3d075dc0
abstractClasses.Employee@3d075dc0
4

Process finished with exit code 0