2回答

• 

  慕粉1246195432

  2018-03-11 20:48:16

  public void testSort() {

  List<Food> food = new ArrayList<Food>();//初始化一个List容器，并确定泛型为Food

  Random random = new Random();

  food.add(new Food(random.nextInt(1000)+"", "Orange"));

  food.add(new Food(random.nextInt(1000)+"", "Apple"));

  food.add(new Food(random.nextInt(1000)+"", "Apple"));

       System.out.println("---------------排序------------------");

       Collections.sort(food);

      //food2是个Food对象，从food的List集合中取出（定义出了泛型（Food），取出的对象就是Food,无需强转）

       for (Food food2 : food) {

      //直接调用Food对象的getId()和getName()方法

       System.out.println("ID:"+food2.getId()+" "+ "名称:"+food2.getName());

       }

  }

  
  

  0 0
• 

  kk求知者

  2018-03-11 20:30:34

  代码看下
  

  0 0