java string iterator_Java：如何从String获取Iterator

一种选择是使用Guava：

ImmutableList chars = Lists.charactersOf(someString);

UnmodifiableListIterator iter = chars.listIterator();

这将生成一个由给定字符串支持的不可变字符列表(不涉及复制).

但是,如果您最终自己完成此操作,我建议不要像其他一些示例那样公开Iterator的实现类.我建议改为创建自己的实用程序类并公开静态工厂方法：

public static Iterator stringIterator(final String string) {

// Ensure the error is found as soon as possible.

if (string == null)

throw new NullPointerException();

return new Iterator() {

private int index = 0;

public boolean hasNext() {

return index < string.length();

}

public Character next() {

/*

* Throw NoSuchElementException as defined by the Iterator contract,

* not IndexOutOfBoundsException.

*/

if (!hasNext())

throw new NoSuchElementException();

return string.charAt(index++);

}

public void remove() {

throw new UnsupportedOperationException();

}

};

}