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摘要： J.U.C 其他组件 FutureTask   介绍 Callable 时我们知道它可以有返回值， 返回值通过Future进行封装 。FutrueTask实现了RunnableFuture接口，该接口继承了Runnable和Future接口，这使得 FutureTask既可以当做 阅读全文

摘要： Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. 阅读全文

摘要： You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list. 阅读全文

摘要： Given a string, find the length of the **longest substring** without repeating characters. 阅读全文