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public class IteratorTest {
    public static void main(String[] args) {
        Collection collection = new ArrayList();

        collection.add("abc");
        collection.add(123);
        collection.add("def");

        //调用集合的iterator()方法 生成迭代器
        Iterator iterator = collection.iterator();

        //使用迭代器遍历集合
        while (iterator.hasNext()){
            System.out.println(iterator.next());
        }
    }
}

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while (iterator.next()!=null){
    System.out.println(iterator.next());
}

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while (collection.iterator().hasNext()){
    System.out.println(collection.iterator().next());
}

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Collection collection = new ArrayList();

collection.add("abc");
collection.add(123);
collection.add("def");
//形式如下
for (Object o : collection) {
    System.out.println(o);
}

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for(元素类名 元素对象名 ：需要迭代的集合){
	//逻辑代码
}

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String[] strings = new String[]{"a","b","c"};

for (String string : strings) {
    string = "x";
}
for (int i = 0; i < strings.length; i++) {
    System.out.println(strings[i]);
}


for (int i = 0; i < strings.length; i++) {
    strings[i] = "y";
}

for (int i = 0; i < strings.length; i++) {
    System.out.println(strings[i]);
}