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与java类似

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冰月冷望

#1 Created at ... [Delete] [Delete and Lock User]
Collection 实现 iterable 
List<Integer> l=new ArrayList<>();
l.add(1);
l.add(2);
...
for(int i:l) 
...

等价于
Iterator it=l.iterator();
while(it.hasNext()){
it.next();
...
}

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