Lambda表达式实现forEach循环遍历

 public static void main(String[] args) {
       // receive();
        List<Integer> list=new ArrayList<Integer>();
        list.add(1);
        list.add(2);
        list.add(3);
        list.add(4);
        for(int i=0;i<list.size();i++){
            System.out.println(list.get(i));
        }
        System.out.println("========================");
        for(int i:list){
            System.out.println(i);
        }
        System.out.println("========================");
        list.forEach(i-> System.out.println(i));

    }