jdk1.8中的for循环问题记录

public static void main(String[] args) {
        List<Animal> list = new ArrayList<Animal>();
        list.add(new Animal("miamiao",2));
        list.add(new Animal("wangwang",4));
        //1.8 a为泛型中的对象
        list.forEach(a ->{
            System.out.println(a.getName());
        });
        
        //1.5 增强行for循环
        for (Animal a : list) {
            System.out.println(a.getName());
        }
        //普通循环
        for(int i =0;i<list.size();i++){
            System.out.println(list.get(i).getName());
        }
    }

List<Integer> numbers = new ArrayList<>();
//no.1
 
for(Integer number : numbers){
 
System.out.println(number);
 
}
 
//no.2
 
for(int index=0,len=numbers.size();index<len;index++){
 
System.out.println(numbers.get(index));
 
}

//no.1
 
numbers.forEach((Integer integer) -> {
 
System.out.println(integer);
 
});
 
//no.2
 
numbers.forEach(integer -> {
 
System.out.println(integer);
 
});
 
//no.3
 
numbers.forEach(integer -> System.out.println(integer));
 
//no.4
 
numbers.forEach(System.out::println);
 
//no.5
 
numbers.forEach(new MyConsumer());