forEachRemaining

        ArrayList<Integer> arrayList=new ArrayList<>();
        for (int i = 0; i <10; i++) {
            arrayList.add(i);
        }
        System.out.println("迭代器第一次遍历");
            Iterator iterator=arrayList.iterator();
            while(iterator.hasNext()){
                System.out.print(iterator.next());
            }
        System.out.println("");
        System.out.println("迭代器第二次遍历");
        Iterator iterator0=arrayList.iterator();
        while(iterator.hasNext()){
            System.out.print(iterator0.next());
        }

上面迭代器只能遍历一次，第二次遍历时里面已经没有了元素，就不遍历了

二：

 ArrayList<Integer> arrayList=new ArrayList<>();
        for (int i = 0; i <10; i++) {
            arrayList.add(i);
        }
        System.out.println("迭代器第一次遍历");
            Iterator<Integer> iterator=arrayList.iterator();
            while(iterator.hasNext()){
             int num=iterator.next();
                System.out.print(num);
                if(num==5){
                    break;
                }
            }
        System.out.println("");
        System.out.println("输出其余元素：");
        iterator.forEachRemaining(new Consumer<Integer>() {
            @Override
            public void accept(Integer s) {
                System.out.print(s);
            }
        });

forEachRemaining继续输出其余的元素