northern

从字节码可以看出，foreach使用了Iterator迭代器，循环判断hashNext()，用next()取操作对象。
Collection接口继承了Iterable接口，可以获取iterator对象。【Iterator iterator();】
集合对象有对应的xxIterator，实现具体的hashNext()、next()、remove()等操作。
反编译源码更直观。

命令行方式

编译成.class文件后，执行javap命令

1

javap -c xx.class

Q&A

《Java8函数式编程》

leetCode: 9. Palindrome Number

leetCode: 8. String to Integer (atoi)

leetCode: 6. ZigZag Conversion

Welcome to Hexo! This is your very first post. Check documentation for more info. If you get any problems when using Hexo, you can find the answer in troubleshooting or you can ask me on GitHub.

leetCode: 5. Longest Palindromic Substring

leetCode: 3. Longest Substring Without Repeating Characters