1 导包：import java.util.ArrayList;

1 ArrayList<要存储元素的数据类型> 变量名 = new ArrayList<要存储元素的数据类型>();

 1 import java.util.ArrayList;2 class demo 3 {4     public static void main(String[] args) 5     {6         //做个车库7         Car car1= new Car();8         car.pinpai="大众";9         car.color="白色";
10         car.size=16;
11         Car car2= new Car();
12         car.pinpai="雪佛兰";
13         car.color="黑色";
14         car.size=18;
15         //创建车库
16         ArrayList<Car> cheku=new ArrayList<Car>();
17
18         //添加车
19         cheku.add(car1);
20         cheku.add(car1);
21         //取车
22         for(int i=0;i<cheku.size();i++){
23             System.out.println("车的品牌"+cheku.get(i).pinpai);
24             System.out.println("车的颜色"+cheku.get(i).color);
25         }
26         //
27
28
29     }
30 }

 1 import java.util.ArrayList;2 class yuangong 3 {4     public static void main(String[] args) 5     {6         //创建员工类对象7         Employee yg1=new Employee();8         Employee yg2=new Employee();9         Employee yg3=new Employee();
10         //创建集合
11         ArrayList<Employee> list=new ArrayList<Employee>();
12         list.add(yg1);
13         list.add(yg2);
14         list.add(yg3);
15         //创建数组
16         String[] ygxingming={"梅西","c.罗","内马尔"};
17         int[] ygid={1,2,3};
18         double[] yggongzi={4500,3000,3000};
19         //将数组数据存入集合中
20         for(int i=0;i<list.size();i++){
21             list.get(i).name=ygxingming[i];
22             list.get(i).id=ygid[i];
23             list.get(i).price=yggongzi[i];
24         }
25         //遍历集合
26         for(int j=0;j<list.size();j++){
27             System.out.println("员工姓名为："+list.get(j).name+"\t员工工号为："+list.get(j).id+"\t员工工资为："+list.get(j).price);
28         }
29     }
30 }