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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。

There is a newer version: 5.8.34

package cn.hutool.core.collection;

import cn.hutool.core.lang.Assert;

import java.util.Iterator;
import java.util.function.Function;

/**
 * 使用给定的转换函数，转换源{@link Iterator}为新类型的{@link Iterator}
 *
 * @param  源元素类型
 * @param  目标元素类型
 * @author looly
 * @since 5.4.3
 */
public class TransIter implements Iterator {

	private final Iterator backingIterator;
	private final Function func;

	/**
	 * 构造
	 *
	 * @param backingIterator 源{@link Iterator}
	 * @param func            转换函数
	 */
	public TransIter(final Iterator backingIterator, final Function func) {
		this.backingIterator = Assert.notNull(backingIterator);
		this.func = Assert.notNull(func);
	}

	@Override
	public final boolean hasNext() {
		return backingIterator.hasNext();
	}

	@Override
	public final T next() {
		return func.apply(backingIterator.next());
	}

	@Override
	public final void remove() {
		backingIterator.remove();
	}
}